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Contents Elon Musk Elon Reeve Musk (/ˈiːlɒn/ EE-lon; born June 28, 1971) is a businessman and entrepreneur known for his leadership of Tesla, SpaceX, Twitter, and xAI. Musk has been the wealthiest person in the world since 2025; as of February 2026,[update] Forbes estimates his net worth to be around US$852 billion. Born into a wealthy family in Pretoria, South Africa, Musk emigrated in 1989 to Canada; he has Canadian citizenship since his mother was born there. He received bachelor's degrees in 1997 from the University of Pennsylvania before moving to California to pursue business ventures. In 1995, Musk co-founded the software company Zip2. Following its sale in 1999, he co-founded X.com, an online payment company that later merged to form PayPal, which was acquired by eBay in 2002. Musk also became an American citizen in 2002. In 2002, Musk founded the space technology company SpaceX, becoming its CEO and chief engineer; the company has since led innovations in reusable rockets and commercial spaceflight. Musk joined the automaker Tesla as an early investor in 2004 and became its CEO and product architect in 2008; it has since become a leader in electric vehicles. In 2015, he co-founded OpenAI to advance artificial intelligence (AI) research, but later left; growing discontent with the organization's direction and their leadership in the AI boom in the 2020s led him to establish xAI, which became a subsidiary of SpaceX in 2026. In 2022, he acquired the social network Twitter, implementing significant changes, and rebranding it as X in 2023. His other businesses include the neurotechnology company Neuralink, which he co-founded in 2016, and the tunneling company the Boring Company, which he founded in 2017. In November 2025, a Tesla pay package worth $1 trillion for Musk was approved, which he is to receive over 10 years if he meets specific goals. Musk was the largest donor in the 2024 U.S. presidential election, where he supported Donald Trump. After Trump was inaugurated as president in early 2025, Musk served as Senior Advisor to the President and as the de facto head of the Department of Government Efficiency (DOGE). After a public feud with Trump, Musk left the Trump administration and returned to managing his companies. Musk is a supporter of global far-right figures, causes, and political parties. His political activities, views, and statements have made him a polarizing figure. Musk has been criticized for COVID-19 misinformation, promoting conspiracy theories, and affirming antisemitic, racist, and transphobic comments. His acquisition of Twitter was controversial due to a subsequent increase in hate speech and the spread of misinformation on the service, following his pledge to decrease censorship. His role in the second Trump administration attracted public backlash, particularly in response to DOGE. The emails he sent to Jeffrey Epstein are included in the Epstein files, which were published between 2025–26 and became a topic of worldwide debate. Early life Elon Reeve Musk was born on June 28, 1971, in Pretoria, South Africa's administrative capital. He is of British and Pennsylvania Dutch ancestry. His mother, Maye (née Haldeman), is a model and dietitian born in Saskatchewan, Canada, and raised in South Africa. Musk therefore holds both South African and Canadian citizenship from birth. His father, Errol Musk, is a South African electromechanical engineer, pilot, sailor, consultant, emerald dealer, and property developer, who partly owned a rental lodge at Timbavati Private Nature Reserve. His maternal grandfather, Joshua N. Haldeman, who died in a plane crash when Elon was a toddler, was an American-born Canadian chiropractor, aviator and political activist in the technocracy movement who moved to South Africa in 1950. Elon has a younger brother, Kimbal, a younger sister, Tosca, and four paternal half-siblings. Musk was baptized as a child in the Anglican Church of Southern Africa. Despite both Elon and Errol previously stating that Errol was a part owner of a Zambian emerald mine, in 2023, Errol recounted that the deal he made was to receive "a portion of the emeralds produced at three small mines". Errol was elected to the Pretoria City Council as a representative of the anti-apartheid Progressive Party and has said that his children shared their father's dislike of apartheid. After his parents divorced in 1979, Elon, aged around 9, chose to live with his father because Errol Musk had an Encyclopædia Britannica and a computer. Elon later regretted his decision and became estranged from his father. Elon has recounted trips to a wilderness school that he described as a "paramilitary Lord of the Flies" where "bullying was a virtue" and children were encouraged to fight over rations. In one incident, after an altercation with a fellow pupil, Elon was thrown down concrete steps and beaten severely, leading to him being hospitalized for his injuries. Elon described his father berating him after he was discharged from the hospital. Errol denied berating Elon and claimed, "The [other] boy had just lost his father to suicide, and Elon had called him stupid. Elon had a tendency to call people stupid. How could I possibly blame that child?" Elon was an enthusiastic reader of books, and had attributed his success in part to having read The Lord of the Rings, the Foundation series, and The Hitchhiker's Guide to the Galaxy. At age ten, he developed an interest in computing and video games, teaching himself how to program from the VIC-20 user manual. At age twelve, Elon sold his BASIC-based game Blastar to PC and Office Technology magazine for approximately $500 (equivalent to $1,600 in 2025). Musk attended Waterkloof House Preparatory School, Bryanston High School, and then Pretoria Boys High School, where he graduated. Musk was a decent but unexceptional student, earning a 61/100 in Afrikaans and a B on his senior math certification. Musk applied for a Canadian passport through his Canadian-born mother to avoid South Africa's mandatory military service, which would have forced him to participate in the apartheid regime, as well as to ease his path to immigration to the United States. While waiting for his application to be processed, he attended the University of Pretoria for five months. Musk arrived in Canada in June 1989, connected with a second cousin in Saskatchewan, and worked odd jobs, including at a farm and a lumber mill. In 1990, he entered Queen's University in Kingston, Ontario. Two years later, he transferred to the University of Pennsylvania, where he studied until 1995. Although Musk has said that he earned his degrees in 1995, the University of Pennsylvania did not award them until 1997 – a Bachelor of Arts in physics and a Bachelor of Science in economics from the university's Wharton School. He reportedly hosted large, ticketed house parties to help pay for tuition, and wrote a business plan for an electronic book-scanning service similar to Google Books. In 1994, Musk held two internships in Silicon Valley: one at energy storage startup Pinnacle Research Institute, which investigated electrolytic supercapacitors for energy storage, and another at Palo Alto–based startup Rocket Science Games. In 1995, he was accepted to a graduate program in materials science at Stanford University, but did not enroll. Musk decided to join the Internet boom of the 1990s, applying for a job at Netscape, to which he reportedly never received a response. The Washington Post reported that Musk lacked legal authorization to remain and work in the United States after failing to enroll at Stanford. In response, Musk said he was allowed to work at that time and that his student visa transitioned to an H1-B. According to numerous former business associates and shareholders, Musk said he was on a student visa at the time. Business career In 1995, Musk, his brother Kimbal, and Greg Kouri founded the web software company Zip2 with funding from a group of angel investors. They housed the venture at a small rented office in Palo Alto. Replying to Rolling Stone, Musk denounced the notion that they started their company with funds borrowed from Errol Musk, but in a tweet, he recognized that his father contributed 10% of a later funding round. The company developed and marketed an Internet city guide for the newspaper publishing industry, with maps, directions, and yellow pages. According to Musk, "The website was up during the day and I was coding it at night, seven days a week, all the time." To impress investors, Musk built a large plastic structure around a standard computer to create the impression that Zip2 was powered by a small supercomputer. The Musk brothers obtained contracts with The New York Times and the Chicago Tribune, and persuaded the board of directors to abandon plans for a merger with CitySearch. Musk's attempts to become CEO were thwarted by the board. Compaq acquired Zip2 for $307 million in cash in February 1999 (equivalent to $590,000,000 in 2025), and Musk received $22 million (equivalent to $43,000,000 in 2025) for his 7-percent share. In 1999, Musk co-founded X.com, an online financial services and e-mail payment company. The startup was one of the first federally insured online banks, and, in its initial months of operation, over 200,000 customers joined the service. The company's investors regarded Musk as inexperienced and replaced him with Intuit CEO Bill Harris by the end of the year. The following year, X.com merged with online bank Confinity to avoid competition. Founded by Max Levchin and Peter Thiel, Confinity had its own money-transfer service, PayPal, which was more popular than X.com's service. Within the merged company, Musk returned as CEO. Musk's preference for Microsoft software over Unix created a rift in the company and caused Thiel to resign. Due to resulting technological issues and lack of a cohesive business model, the board ousted Musk and replaced him with Thiel in 2000.[b] Under Thiel, the company focused on the PayPal service and was renamed PayPal in 2001. In 2002, PayPal was acquired by eBay for $1.5 billion (equivalent to $2,700,000,000 in 2025) in stock, of which Musk—the largest shareholder with 11.72% of shares—received $175.8 million (equivalent to $320,000,000 in 2025). In 2017, Musk purchased the domain X.com from PayPal for an undisclosed amount, stating that it had sentimental value. In 2001, Musk became involved with the nonprofit Mars Society and discussed funding plans to place a growth-chamber for plants on Mars. Seeking a way to launch the greenhouse payloads into space, Musk made two unsuccessful trips to Moscow to purchase intercontinental ballistic missiles (ICBMs) from Russian companies NPO Lavochkin and Kosmotras. Musk instead decided to start a company to build affordable rockets. With $100 million of his early fortune, (equivalent to $180,000,000 in 2025) Musk founded SpaceX in May 2002 and became the company's CEO and Chief Engineer. SpaceX attempted its first launch of the Falcon 1 rocket in 2006. Although the rocket failed to reach Earth orbit, it was awarded a Commercial Orbital Transportation Services program contract from NASA, then led by Mike Griffin. After two more failed attempts that nearly caused Musk to go bankrupt, SpaceX succeeded in launching the Falcon 1 into orbit in 2008. Later that year, SpaceX received a $1.6 billion NASA contract (equivalent to $2,400,000,000 in 2025) for Falcon 9-launched Dragon spacecraft flights to the International Space Station (ISS), replacing the Space Shuttle after its 2011 retirement. In 2012, the Dragon vehicle docked with the ISS, a first for a commercial spacecraft. Working towards its goal of reusable rockets, in 2015 SpaceX successfully landed the first stage of a Falcon 9 on a land platform. Later landings were achieved on autonomous spaceport drone ships, an ocean-based recovery platform. In 2018, SpaceX launched the Falcon Heavy; the inaugural mission carried Musk's personal Tesla Roadster as a dummy payload. Since 2019, SpaceX has been developing Starship, a reusable, super heavy-lift launch vehicle intended to replace the Falcon 9 and Falcon Heavy. In 2020, SpaceX launched its first crewed flight, the Demo-2, becoming the first private company to place astronauts into orbit and dock a crewed spacecraft with the ISS. In 2024, NASA awarded SpaceX an $843 million (equivalent to $865,000,000 in 2025) contract to build a spacecraft that NASA will use to deorbit the ISS at the end of its lifespan. In 2015, SpaceX began development of the Starlink constellation of low Earth orbit satellites to provide satellite Internet access. After the launch of prototype satellites in 2018, the first large constellation was deployed in May 2019. As of May 2025[update], over 7,600 Starlink satellites are operational, comprising 65% of all operational Earth satellites. The total cost of the decade-long project to design, build, and deploy the constellation was estimated by SpaceX in 2020 to be $10 billion (equivalent to $12,000,000,000 in 2025).[c] During the Russian invasion of Ukraine, Musk provided free Starlink service to Ukraine, permitting Internet access and communication at a yearly cost to SpaceX of $400 million (equivalent to $440,000,000 in 2025). However, Musk refused to block Russian state media on Starlink. In 2023, Musk denied Ukraine's request to activate Starlink over Crimea to aid an attack against the Russian navy, citing fears of a nuclear response. Tesla, Inc., originally Tesla Motors, was incorporated in July 2003 by Martin Eberhard and Marc Tarpenning. Both men played active roles in the company's early development prior to Musk's involvement. Musk led the Series A round of investment in February 2004; he invested $6.35 million (equivalent to $11,000,000 in 2025), became the majority shareholder, and joined Tesla's board of directors as chairman. Musk took an active role within the company and oversaw Roadster product design, but was not deeply involved in day-to-day business operations. Following a series of escalating conflicts in 2007 and the 2008 financial crisis, Eberhard was ousted from the firm.[page needed] Musk assumed leadership of the company as CEO and product architect in 2008. A 2009 lawsuit settlement with Eberhard designated Musk as a Tesla co-founder, along with Tarpenning and two others. Tesla began delivery of the Roadster, an electric sports car, in 2008. With sales of about 2,500 vehicles, it was the first mass production all-electric car to use lithium-ion battery cells. Under Musk, Tesla has since launched several well-selling electric vehicles, including the four-door sedan Model S (2012), the crossover Model X (2015), the mass-market sedan Model 3 (2017), the crossover Model Y (2020), and the pickup truck Cybertruck (2023). In May 2020, Musk resigned as chairman of the board as part of the settlement of a lawsuit from the SEC over him tweeting that funding had been "secured" for potentially taking Tesla private. The company has also constructed multiple lithium-ion battery and electric vehicle factories, called Gigafactories. Since its initial public offering in 2010, Tesla stock has risen significantly; it became the most valuable carmaker in summer 2020, and it entered the S&P 500 later that year. In October 2021, it reached a market capitalization of $1 trillion (equivalent to $1,200,000,000,000 in 2025), the sixth company in U.S. history to do so. Musk provided the initial concept and financial capital for SolarCity, which his cousins Lyndon and Peter Rive founded in 2006. By 2013, SolarCity was the second largest provider of solar power systems in the United States. In 2014, Musk promoted the idea of SolarCity building an advanced production facility in Buffalo, New York, triple the size of the largest solar plant in the United States. Construction of the factory started in 2014 and was completed in 2017. It operated as a joint venture with Panasonic until early 2020. Tesla acquired SolarCity for $2 billion in 2016 (equivalent to $2,700,000,000 in 2025) and merged it with its battery unit to create Tesla Energy. The deal's announcement resulted in a more than 10% drop in Tesla's stock price; at the time, SolarCity was facing liquidity issues. Multiple shareholder groups filed a lawsuit against Musk and Tesla's directors, stating that the purchase of SolarCity was done solely to benefit Musk and came at the expense of Tesla and its shareholders. Tesla directors settled the lawsuit in January 2020, leaving Musk the sole remaining defendant. Two years later, the court ruled in Musk's favor. In 2016, Musk co-founded Neuralink, a neurotechnology startup, with an investment of $100 million. Neuralink aims to integrate the human brain with artificial intelligence (AI) by creating devices that are embedded in the brain. Such technology could enhance memory or allow the devices to communicate with software. The company also hopes to develop devices to treat neurological conditions like spinal cord injuries. In 2022, Neuralink announced that clinical trials would begin by the end of the year. In September 2023, the Food and Drug Administration approved Neuralink to initiate six-year human trials. Neuralink has conducted animal testing on macaques at the University of California, Davis. In 2021, the company released a video in which a macaque played the video game Pong via a Neuralink implant. The company's animal trials—which have caused the deaths of some monkeys—have led to claims of animal cruelty. The Physicians Committee for Responsible Medicine has alleged that Neuralink violated the Animal Welfare Act. Employees have complained that pressure from Musk to accelerate development has led to botched experiments and unnecessary animal deaths. In 2022, a federal probe was launched into possible animal welfare violations by Neuralink.[needs update] In 2017, Musk founded the Boring Company to construct tunnels; he also revealed plans for specialized, underground, high-occupancy vehicles that could travel up to 150 miles per hour (240 km/h) and thus circumvent above-ground traffic in major cities. Early in 2017, the company began discussions with regulatory bodies and initiated construction of a 30-foot (9.1 m) wide, 50-foot (15 m) long, and 15-foot (4.6 m) deep "test trench" on the premises of SpaceX's offices, as that required no permits. The Los Angeles tunnel, less than two miles (3.2 km) in length, debuted to journalists in 2018. It used Tesla Model Xs and was reported to be a rough ride while traveling at suboptimal speeds. Two tunnel projects announced in 2018, in Chicago and West Los Angeles, have been canceled. A tunnel beneath the Las Vegas Convention Center was completed in early 2021. Local officials have approved further expansions of the tunnel system. April 14, 2022 In early 2017, Musk expressed interest in buying Twitter and had questioned the platform's commitment to freedom of speech. By 2022, Musk had reached 9.2% stake in the company, making him the largest shareholder.[d] Musk later agreed to a deal that would appoint him to Twitter's board of directors and prohibit him from acquiring more than 14.9% of the company. Days later, Musk made a $43 billion offer to buy Twitter. By the end of April Musk had successfully concluded his bid for approximately $44 billion. This included approximately $12.5 billion in loans and $21 billion in equity financing. Having backtracked on his initial decision, Musk bought the company on October 27, 2022. Immediately after the acquisition, Musk fired several top Twitter executives including CEO Parag Agrawal; Musk became the CEO instead. Under Elon Musk, Twitter instituted monthly subscriptions for a "blue check", and laid off a significant portion of the company's staff. Musk lessened content moderation and hate speech also increased on the platform after his takeover. In late 2022, Musk released internal documents relating to Twitter's moderation of Hunter Biden's laptop controversy in the lead-up to the 2020 presidential election. Musk also promised to step down as CEO after a Twitter poll, and five months later, Musk stepped down as CEO and transitioned his role to executive chairman and chief technology officer (CTO). Despite Musk stepping down as CEO, X continues to struggle with challenges such as viral misinformation, hate speech, and antisemitism controversies. Musk has been accused of trying to silence some of his critics such as Twitch streamer Asmongold, who criticized him during one of his streams. Musk has been accused of removing their accounts' blue checkmarks, which hinders visibility and is considered a form of shadow banning, or suspending their accounts without justification. Other activities In August 2013, Musk announced plans for a version of a vactrain, and assigned engineers from SpaceX and Tesla to design a transport system between Greater Los Angeles and the San Francisco Bay Area, at an estimated cost of $6 billion. Later that year, Musk unveiled the concept, dubbed the Hyperloop, intended to make travel cheaper than any other mode of transport for such long distances. In December 2015, Musk co-founded OpenAI, a not-for-profit artificial intelligence (AI) research company aiming to develop artificial general intelligence, intended to be safe and beneficial to humanity. Musk pledged $1 billion of funding to the company, and initially gave $50 million. In 2018, Musk left the OpenAI board. Since 2018, OpenAI has made significant advances in machine learning. In July 2023, Musk launched the artificial intelligence company xAI, which aims to develop a generative AI program that competes with existing offerings like OpenAI's ChatGPT. Musk obtained funding from investors in SpaceX and Tesla, and xAI hired engineers from Google and OpenAI. December 16, 2022 Musk uses a private jet owned by Falcon Landing LLC, a SpaceX-linked company, and acquired a second jet in August 2020. His heavy use of the jets and the consequent fossil fuel usage have received criticism. Musk's flight usage is tracked on social media through ElonJet. In December 2022, Musk banned the ElonJet account on Twitter, and made temporary bans on the accounts of journalists that posted stories regarding the incident, including Donie O'Sullivan, Keith Olbermann, and journalists from The New York Times, The Washington Post, CNN, and The Intercept. In October 2025, Musk's company xAI launched Grokipedia, an AI-generated online encyclopedia that he promoted as an alternative to Wikipedia. Articles on Grokipedia are generated and reviewed by xAI's Grok chatbot. Media coverage and academic analysis described Grokipedia as frequently reusing Wikipedia content but framing contested political and social topics in line with Musk's own views and right-wing narratives. A study by Cornell University researchers and NBC News stated that Grokipedia cites sources that are blacklisted or considered "generally unreliable" on Wikipedia, for example, the conspiracy site Infowars and the neo-Nazi forum Stormfront. Wired, The Guardian and Time criticized Grokipedia for factual errors and for presenting Musk himself in unusually positive terms while downplaying controversies. Politics Musk is an outlier among business leaders who typically avoid partisan political advocacy. Musk was a registered independent voter when he lived in California. Historically, he has donated to both Democrats and Republicans, many of whom serve in states in which he has a vested interest. Since 2022, his political contributions have mostly supported Republicans, with his first vote for a Republican going to Mayra Flores in the 2022 Texas's 34th congressional district special election. In 2024, he started supporting international far-right political parties, activists, and causes, and has shared misinformation and numerous conspiracy theories. Since 2024, his views have been generally described as right-wing. Musk supported Barack Obama in 2008 and 2012, Hillary Clinton in 2016, Joe Biden in 2020, and Donald Trump in 2024. In the 2020 Democratic Party presidential primaries, Musk endorsed candidate Andrew Yang and expressed support for Yang's proposed universal basic income, and endorsed Kanye West's 2020 presidential campaign. In 2021, Musk publicly expressed opposition to the Build Back Better Act, a $3.5 trillion legislative package endorsed by Joe Biden that ultimately failed to pass due to unanimous opposition from congressional Republicans and several Democrats. In 2022, gave over $50 million to Citizens for Sanity, a conservative political action committee. In 2023, he supported Republican Ron DeSantis for the 2024 U.S. presidential election, giving $10 million to his campaign, and hosted DeSantis's campaign announcement on a Twitter Spaces event. From June 2023 to January 2024, Musk hosted a bipartisan set of X Spaces with Republican and Democratic candidates, including Robert F. Kennedy Jr., Vivek Ramaswamy, and Dean Phillips. In October 2025, former vice-president Kamala Harris commented that it was a mistake from the Democratic side to not invite Musk to a White House electric vehicle event organized in August 2021 and featuring executives from General Motors, Ford and Stellantis, despite Tesla being "the major American manufacturer of extraordinary innovation in this space." Fortune remarked that this was a nod to United Auto Workers and organized labor. Harris said presidents should put aside political loyalties when it came to recognizing innovation, and guessed that the non-invitation impacted Musk's perspective. Fortune noted that, at the time, Musk said, "Yeah, seems odd that Tesla wasn't invited." A month later, he criticized Biden as "not the friendliest administration." Jacob Silverman, author of the book Gilded Rage: Elon Musk and the Radicalization of Silicon Valley, said that the tech industry represented by Musk, Thiel, Andreessen and other capitalists, actually flourished under Biden, but the tech leaders chose Trump for their common ground on cultural issues. By early 2024, Musk had become a vocal and financial supporter of Donald Trump. In July 2024, minutes after the attempted assassination of Donald Trump, Musk endorsed him for president saying; "I fully endorse President Trump and hope for his rapid recovery." During the presidential campaign, Musk joined Trump on stage at a campaign rally, and during the campaign promoted conspiracy theories and falsehoods about Democrats, election fraud and immigration, in support of Trump. Musk was the largest individual donor of the 2024 election. In 2025, Musk contributed $19 million to the Wisconsin Supreme Court race, hoping to influence the state's future redistricting efforts and its regulations governing car manufacturers and dealers. In 2023, Musk said he shunned the World Economic Forum because it was boring. The organization commented that they had not invited him since 2015. He has participated in Dialog, dubbed "Tech Bilderberg" and organized by Peter Thiel and Auren Hoffman, though. Musk's international political actions and comments have come under increasing scrutiny and criticism, especially from the governments and leaders of France, Germany, Norway, Spain and the United Kingdom, particularly due to his position in the U.S. government as well as ownership of X. An NBC News analysis found he had boosted far-right political movements to cut immigration and curtail regulation of business in at least 18 countries on six continents since 2023. During his speech after the second inauguration of Donald Trump, Musk twice made a gesture interpreted by many as a Nazi or a fascist Roman salute.[e] He thumped his right hand over his heart, fingers spread wide, and then extended his right arm out, emphatically, at an upward angle, palm down and fingers together. He then repeated the gesture to the crowd behind him. As he finished the gestures, he said to the crowd, "My heart goes out to you. It is thanks to you that the future of civilization is assured." It was widely condemned as an intentional Nazi salute in Germany, where making such gestures is illegal. The Anti-Defamation League said it was not a Nazi salute, but other Jewish organizations disagreed and condemned the salute. American public opinion was divided on partisan lines as to whether it was a fascist salute. Musk dismissed the accusations of Nazi sympathies, deriding them as "dirty tricks" and a "tired" attack. Neo-Nazi and white supremacist groups celebrated it as a Nazi salute. Multiple European political parties demanded that Musk be banned from entering their countries. The concept of DOGE emerged in a discussion between Musk and Donald Trump, and in August 2024, Trump committed to giving Musk an advisory role, with Musk accepting the offer. In November and December 2024, Musk suggested that the organization could help to cut the U.S. federal budget, consolidate the number of federal agencies, and eliminate the Consumer Financial Protection Bureau, and that its final stage would be "deleting itself". In January 2025, the organization was created by executive order, and Musk was designated a "special government employee". Musk led the organization and was a senior advisor to the president, although his official role is not clear. In sworn statement during a lawsuit, the director of the White House Office of Administration stated that Musk "is not an employee of the U.S. DOGE Service or U.S. DOGE Service Temporary Organization", "is not the U.S. DOGE Service administrator", and has "no actual or formal authority to make government decisions himself". Trump said two days later that he had put Musk in charge of DOGE. A federal judge has ruled that Musk acted as the de facto leader of DOGE. Musk's role in the second Trump administration, particularly in response to DOGE, has attracted public backlash. He was criticized for his treatment of federal government employees, including his influence over the mass layoffs of the federal workforce. He has prioritized secrecy within the organization and has accused others of violating privacy laws. A Senate report alleged that Musk could avoid up to $2 billion in legal liability as a result of DOGE's actions. In May 2025, Bill Gates accused Musk of "killing the world's poorest children" through his cuts to USAID, which modeling by Boston University estimated had resulted in 300,000 deaths by this time, most of them of children. By November 2025, the estimated death toll had increased to 400,000 children and 200,000 adults. Musk announced on May 28, 2025, that he would depart from the Trump administration as planned when the special government employee's 130 day deadline expired, with a White House official confirming that Musk's offboarding from the Trump administration was already underway. His departure was officially confirmed during a joint Oval Office press conference with Trump on May 30, 2025. @realDonaldTrump is in the Epstein files. That is the real reason they have not been made public. June 5, 2025 After leaving office, Musk criticized the Trump administration's Big Beautiful Bill, calling it a "disgusting abomination" due to its provisions increasing the deficit. A feud began between Musk and Trump, with its most notable event being Musk alleging Trump had ties to sex offender Jeffrey Epstein on X (formerly Twitter) on June 5, 2025. Trump responded on Truth Social stating that Musk went "CRAZY" after the "EV Mandate" was purportedly taken away and threatened to cut Musk's government contracts. Musk then called for a third Trump impeachment. The next day, Trump stated that he did not wish to reconcile with Musk, and added that Musk would face "very serious consequences" if he funds Democratic candidates. On June 11, Musk publicly apologized for the tweets against Trump, saying they "went too far". Views November 6, 2022 Rejecting the conservative label, Musk has described himself as a political moderate, even as his views have become more right-wing over time. His views have been characterized as libertarian and far-right, and after his involvement in European politics, they have received criticism from world leaders such as Emmanuel Macron and Olaf Scholz. Within the context of American politics, Musk supported Democratic candidates up until 2022, at which point he voted for a Republican for the first time. He has stated support for universal basic income, gun rights, freedom of speech, a tax on carbon emissions, and H-1B visas. Musk has expressed concern about issues such as artificial intelligence (AI) and climate change, and has been a critic of wealth tax, short-selling, and government subsidies. An immigrant himself, Musk has been accused of being anti-immigration, and regularly blames immigration policies for illegal immigration. He is also a pronatalist who believes population decline is the biggest threat to civilization, and identifies as a cultural Christian. Musk has long been an advocate for space colonization, especially the colonization of Mars. He has repeatedly pushed for humanity colonizing Mars, in order to become an interplanetary species and lower the risks of human extinction. Musk has promoted conspiracy theories and made controversial statements that have led to accusations of racism, sexism, antisemitism, transphobia, disseminating disinformation, and support of white pride. While describing himself as a "pro-Semite", his comments regarding George Soros and Jewish communities have been condemned by the Anti-Defamation League and the Biden White House. Musk was criticized during the COVID-19 pandemic for making unfounded epidemiological claims, defying COVID-19 lockdowns restrictions, and supporting the Canada convoy protest against vaccine mandates. He has amplified false claims of white genocide in South Africa. Musk has been critical of Israel's actions in the Gaza Strip during the Gaza war, praised China's economic and climate goals, suggested that Taiwan and China should resolve cross-strait relations, and was described as having a close relationship with the Chinese government. In Europe, Musk expressed support for Ukraine in 2022 during the Russian invasion, recommended referendums and peace deals on the annexed Russia-occupied territories, and supported the far-right Alternative for Germany political party in 2024. Regarding British politics, Musk blamed the 2024 UK riots on mass migration and open borders, criticized Prime Minister Keir Starmer for what he described as a "two-tier" policing system, and was subsequently attacked as being responsible for spreading misinformation and amplifying the far-right. He has also voiced his support for far-right activist Tommy Robinson and pledged electoral support for Reform UK. In February 2026, Musk described Spanish Prime Minister Pedro Sánchez as a "tyrant" following Sánchez's proposal to prohibit minors under the age of 16 from accessing social media platforms. Legal affairs In 2018, Musk was sued by the U.S. Securities and Exchange Commission (SEC) for a tweet stating that funding had been secured for potentially taking Tesla private.[f] The securities fraud lawsuit characterized the tweet as false, misleading, and damaging to investors, and sought to bar Musk from serving as CEO of publicly traded companies. Two days later, Musk settled with the SEC, without admitting or denying the SEC's allegations. As a result, Musk and Tesla were fined $20 million each, and Musk was forced to step down for three years as Tesla chairman but was able to remain as CEO. Shareholders filed a lawsuit over the tweet, and in February 2023, a jury found Musk and Tesla not liable. Musk has stated in interviews that he does not regret posting the tweet that triggered the SEC investigation. In 2019, Musk stated in a tweet that Tesla would build half a million cars that year. The SEC reacted by asking a court to hold him in contempt for violating the terms of the 2018 settlement agreement. A joint agreement between Musk and the SEC eventually clarified the previous agreement details, including a list of topics about which Musk needed preclearance. In 2020, a judge blocked a lawsuit that claimed a tweet by Musk regarding Tesla stock price ("too high imo") violated the agreement. Freedom of Information Act (FOIA)-released records showed that the SEC concluded Musk had subsequently violated the agreement twice by tweeting regarding "Tesla's solar roof production volumes and its stock price". In October 2023, the SEC sued Musk over his refusal to testify a third time in an investigation into whether he violated federal law by purchasing Twitter stock in 2022. In February 2024, Judge Laurel Beeler ruled that Musk must testify again. In January 2025, the SEC filed a lawsuit against Musk for securities violations related to his purchase of Twitter. In January 2024, Delaware judge Kathaleen McCormick ruled in a 2018 lawsuit that Musk's $55 billion pay package from Tesla be rescinded. McCormick called the compensation granted by the company's board "an unfathomable sum" that was unfair to shareholders. The Delaware Supreme Court overturned McCormick's decision in December 2025, restoring Musk's compensation package and awarding $1 in nominal damages. Personal life Musk became a U.S. citizen in 2002. From the early 2000s until late 2020, Musk resided in California, where both Tesla and SpaceX were founded. He then relocated to Cameron County, Texas, saying that California had become "complacent" about its economic success. While hosting Saturday Night Live in 2021, Musk stated that he has Asperger syndrome (an outdated term for autism spectrum disorder). When asked about his experience growing up with Asperger's syndrome in a TED2022 conference in Vancouver, Musk stated that "the social cues were not intuitive ... I would just tend to take things very literally ... but then that turned out to be wrong — [people were not] simply saying exactly what they mean, there's all sorts of other things that are meant, and [it] took me a while to figure that out." Musk suffers from back pain and has undergone several spine-related surgeries, including a disc replacement. In 2000, he contracted a severe case of malaria while on vacation in South Africa. Musk has stated he uses doctor-prescribed ketamine for occasional depression and that he doses "a small amount once every other week or something like that"; since January 2024, some media outlets have reported that he takes ketamine, marijuana, LSD, ecstasy, mushrooms, cocaine and other drugs. Musk at first refused to comment on his alleged drug use, before responding that he had not tested positive for drugs, and that if drugs somehow improved his productivity, "I would definitely take them!". The New York Times' investigations revealed Musk's overuse of ketamine and numerous other drugs, as well as strained family relationships and concerns from close associates who have become troubled by his public behavior as he became more involved in political activities and government work. According to The Washington Post, President Trump described Musk as "a big-time drug addict". Through his own label Emo G Records, Musk released a rap track, "RIP Harambe", on SoundCloud in March 2019. The following year, he released an EDM track, "Don't Doubt Ur Vibe", featuring his own lyrics and vocals. Musk plays video games, which he stated has a "'restoring effect' that helps his 'mental calibration'". Some games he plays include Quake, Diablo IV, Elden Ring, and Polytopia. Musk once claimed to be one of the world's top video game players but has since admitted to "account boosting", or cheating by hiring outside services to achieve top player rankings. Musk has justified the boosting by claiming that all top accounts do it so he has to as well to remain competitive. In 2024 and 2025, Musk criticized the video game Assassin's Creed Shadows and its creator Ubisoft for "woke" content. Musk posted to X that "DEI kills art" and specified the inclusion of the historical figure Yasuke in the Assassin's Creed game as offensive; he also called the game "terrible". Ubisoft responded by saying that Musk's comments were "just feeding hatred" and that they were focused on producing a game not pushing politics. Musk has fathered at least 14 children, one of whom died as an infant. The Wall Street Journal reported in 2025 that sources close to Musk suggest that the "true number of Musk's children is much higher than publicly known". He had six children with his first wife, Canadian author Justine Wilson, whom he met while attending Queen's University in Ontario, Canada; they married in 2000. In 2002, their first child Nevada Musk died of sudden infant death syndrome at the age of 10 weeks. After his death, the couple used in vitro fertilization (IVF) to continue their family; they had twins in 2004, followed by triplets in 2006. The couple divorced in 2008 and have shared custody of their children. The elder twin he had with Wilson came out as a trans woman and, in 2022, officially changed her name to Vivian Jenna Wilson, adopting her mother's surname because she no longer wished to be associated with Musk. Musk began dating English actress Talulah Riley in 2008. They married two years later at Dornoch Cathedral in Scotland. In 2012, the couple divorced, then remarried the following year. After briefly filing for divorce in 2014, Musk finalized a second divorce from Riley in 2016. Musk then dated the American actress Amber Heard for several months in 2017; he had reportedly been "pursuing" her since 2012. In 2018, Musk and Canadian musician Grimes confirmed they were dating. Grimes and Musk have three children, born in 2020, 2021, and 2022.[g] Musk and Grimes originally gave their eldest child the name "X Æ A-12", which would have violated California regulations as it contained characters that are not in the modern English alphabet; the names registered on the birth certificate are "X" as a first name, "Æ A-Xii" as a middle name, and "Musk" as a last name. They received criticism for choosing a name perceived to be impractical and difficult to pronounce; Musk has said the intended pronunciation is "X Ash A Twelve". Their second child was born via surrogacy. Despite the pregnancy, Musk confirmed reports that the couple were "semi-separated" in September 2021; in an interview with Time in December 2021, he said he was single. In October 2023, Grimes sued Musk over parental rights and custody of X Æ A-Xii. Elon Musk has taken X Æ A-Xii to multiple official events in Washington, D.C. during Trump's second term in office. Also in July 2022, The Wall Street Journal reported that Musk allegedly had an affair with Nicole Shanahan, the wife of Google co-founder Sergey Brin, in 2021, leading to their divorce the following year. Musk denied the report. Musk also had a relationship with Australian actress Natasha Bassett, who has been described as "an occasional girlfriend". In October 2024, The New York Times reported Musk bought a Texas compound for his children and their mothers, though Musk denied having done so. Musk also has four children with Shivon Zilis, director of operations and special projects at Neuralink: twins born via IVF in 2021, a child born in 2024 via surrogacy and a child born in 2025.[h] On February 14, 2025, Ashley St. Clair, an influencer and author, posted on X claiming to have given birth to Musk's son Romulus five months earlier, which media outlets reported as Musk's supposed thirteenth child.[i] On February 22, 2025, it was reported that St Clair had filed for sole custody of her five-month-old son and for Musk to be recognised as the child's father. On March 31, 2025, Musk wrote that, while he was unsure if he was the father of St. Clair's child, he had paid St. Clair $2.5 million and would continue paying her $500,000 per year.[j] Later reporting from the Wall Street Journal indicated that $1 million of these payments to St. Clair were structured as a loan. In 2014, Musk and Ghislaine Maxwell appeared together in a photograph taken at an Academy Awards after-party, which Musk later described as a "photobomb". The January 2026 Epstein files contain emails between Musk and Epstein from 2012 to 2013, after Epstein's first conviction. Emails released on January 30, 2026, indicated that Epstein invited Musk to visit his private island on multiple occasions. The correspondence showed that while Epstein repeatedly encouraged Musk to attend, Musk did not visit the island. In one instance, Musk discussed the possibility of attending a party with his then-wife Talulah Riley and asked which day would be the "wildest party"; according to the emails, the visit did not take place after Epstein later cancelled the plans.[k] On Christmas day in 2012, Musk emailed Epstein asking "Do you have any parties planned? I’ve been working to the edge of sanity this year and so, once my kids head home after Christmas, I really want to hit the party scene in St Barts or elsewhere and let loose. The invitation is much appreciated, but a peaceful island experience is the opposite of what I’m looking for". Epstein replied that the "ratio on my island" might make Musk's wife uncomfortable to which Musk responded, "Ratio is not a problem for Talulah". On September 11, 2013, Epstein sent an email asking Musk if he had any plans for coming to New York for the opening of the United Nations General Assembly where many "interesting people" would be coming to his house to which Musk responded that "Flying to NY to see UN diplomats do nothing would be an unwise use of time". Epstein responded by stating "Do you think i am retarded. Just kidding, there is no one over 25 and all very cute." Musk has denied any close relationship with Epstein and described him as a "creep" who attempted to ingratiate himself with influential people. When Musk was asked in 2019 if he introduced Epstein to Mark Zuckerberg, Musk responded: "I don’t recall introducing Epstein to anyone, as I don’t know the guy well enough to do so." The released emails nonetheless showed cordial exchanges on a range of topics, including Musk's inquiry about parties on the island. The correspondence also indicated that Musk suggested hosting Epstein at SpaceX, while Epstein separately discussed plans to tour SpaceX and bring "the girls", though there is no evidence that such a visit occurred. Musk has described the release of the files a "distraction", later accusing the second Trump administration of suppressing them to protect powerful individuals, including Trump himself.[l] Wealth Elon Musk is the wealthiest person in the world, with an estimated net worth of US$690 billion as of January 2026, according to the Bloomberg Billionaires Index, and $852 billion according to Forbes, primarily from his ownership stakes in SpaceX and Tesla. Having been first listed on the Forbes Billionaires List in 2012, around 75% of Musk's wealth was derived from Tesla stock in November 2020, although he describes himself as "cash poor". According to Forbes, he became the first person in the world to achieve a net worth of $300 billion in 2021; $400 billion in December 2024; $500 billion in October 2025; $600 billion in mid-December 2025; $700 billion later that month; and $800 billion in February 2026. In November 2025, a Tesla pay package worth potentially $1 trillion for Musk was approved, which he is to receive over 10 years if he meets specific goals. Public image Although his ventures have been highly influential within their separate industries starting in the 2000s, Musk only became a public figure in the early 2010s. He has been described as an eccentric who makes spontaneous and impactful decisions, while also often making controversial statements, contrary to other billionaires who prefer reclusiveness to protect their businesses. Musk's actions and his expressed views have made him a polarizing figure. Biographer Ashlee Vance described people's opinions of Musk as polarized due to his "part philosopher, part troll" persona on Twitter. He has drawn denouncement for using his platform to mock the self-selection of personal pronouns, while also receiving praise for bringing international attention to matters like British survivors of grooming gangs. Musk has been described as an American oligarch due to his extensive influence over public discourse, social media, industry, politics, and government policy. After Trump's re-election, Musk's influence and actions during the transition period and the second presidency of Donald Trump led some to call him "President Musk", the "actual president-elect", "shadow president" or "co-president". Awards for his contributions to the development of the Falcon rockets include the American Institute of Aeronautics and Astronautics George Low Transportation Award in 2008, the Fédération Aéronautique Internationale Gold Space Medal in 2010, and the Royal Aeronautical Society Gold Medal in 2012. In 2015, he received an honorary doctorate in engineering and technology from Yale University and an Institute of Electrical and Electronics Engineers Honorary Membership. Musk was elected a Fellow of the Royal Society (FRS) in 2018.[m] In 2022, Musk was elected to the National Academy of Engineering. Time has listed Musk as one of the most influential people in the world in 2010, 2013, 2018, and 2021. Musk was selected as Time's "Person of the Year" for 2021. Then Time editor-in-chief Edward Felsenthal wrote that, "Person of the Year is a marker of influence, and few individuals have had more influence than Musk on life on Earth, and potentially life off Earth too." Notes References Works cited Further reading External links |
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[SOURCE: https://en.wikipedia.org/wiki/Mars#cite_ref-:0_41-1] | [TOKENS: 11899] |
Contents Mars Mars is the fourth planet from the Sun. It is also known as the "Red Planet", for its orange-red appearance. Mars is a desert-like rocky planet with a tenuous atmosphere that is primarily carbon dioxide (CO2). At the average surface level the atmospheric pressure is a few thousandths of Earth's, atmospheric temperature ranges from −153 to 20 °C (−243 to 68 °F), and cosmic radiation is high. Mars retains some water, in the ground as well as thinly in the atmosphere, forming cirrus clouds, fog, frost, larger polar regions of permafrost and ice caps (with seasonal CO2 snow), but no bodies of liquid surface water. Its surface gravity is roughly a third of Earth's or double that of the Moon. Its diameter, 6,779 km (4,212 mi), is about half the Earth's, or twice the Moon's, and its surface area is the size of all the dry land of Earth. Fine dust is prevalent across the surface and the atmosphere, being picked up and spread at the low Martian gravity even by the weak wind of the tenuous atmosphere. The terrain of Mars roughly follows a north-south divide, the Martian dichotomy, with the northern hemisphere mainly consisting of relatively flat, low lying plains, and the southern hemisphere of cratered highlands. Geologically, the planet is fairly active with marsquakes trembling underneath the ground, but also hosts many enormous volcanoes that are extinct (the tallest is Olympus Mons, 21.9 km or 13.6 mi tall), as well as one of the largest canyons in the Solar System (Valles Marineris, 4,000 km or 2,500 mi long). Mars has two natural satellites that are small and irregular in shape: Phobos and Deimos. With a significant axial tilt of 25 degrees, Mars experiences seasons, like Earth (which has an axial tilt of 23.5 degrees). A Martian solar year is equal to 1.88 Earth years (687 Earth days), a Martian solar day (sol) is equal to 24.6 hours. Mars formed along with the other planets approximately 4.5 billion years ago. During the martian Noachian period (4.5 to 3.5 billion years ago), its surface was marked by meteor impacts, valley formation, erosion, the possible presence of water oceans and the loss of its magnetosphere. The Hesperian period (beginning 3.5 billion years ago and ending 3.3–2.9 billion years ago) was dominated by widespread volcanic activity and flooding that carved immense outflow channels. The Amazonian period, which continues to the present, is the currently dominating and remaining influence on geological processes. Because of Mars's geological history, the possibility of past or present life on Mars remains an area of active scientific investigation, with some possible traces needing further examination. Being visible with the naked eye in Earth's sky as a red wandering star, Mars has been observed throughout history, acquiring diverse associations in different cultures. In 1963 the first flight to Mars took place with Mars 1, but communication was lost en route. The first successful flyby exploration of Mars was conducted in 1965 with Mariner 4. In 1971 Mariner 9 entered orbit around Mars, being the first spacecraft to orbit any body other than the Moon, Sun or Earth; following in the same year were the first uncontrolled impact (Mars 2) and first successful landing (Mars 3) on Mars. Probes have been active on Mars continuously since 1997. At times, more than ten probes have simultaneously operated in orbit or on the surface, more than at any other planet beyond Earth. Mars is an often proposed target for future crewed exploration missions, though no such mission is currently planned. Natural history Scientists have theorized that during the Solar System's formation, Mars was created as the result of a random process of run-away accretion of material from the protoplanetary disk that orbited the Sun. Mars has many distinctive chemical features caused by its position in the Solar System. Elements with comparatively low boiling points, such as chlorine, phosphorus, and sulfur, are much more common on Mars than on Earth; these elements were probably pushed outward by the young Sun's energetic solar wind. After the formation of the planets, the inner Solar System may have been subjected to the so-called Late Heavy Bombardment. About 60% of the surface of Mars shows a record of impacts from that era, whereas much of the remaining surface is probably underlain by immense impact basins caused by those events. However, more recent modeling has disputed the existence of the Late Heavy Bombardment. There is evidence of an enormous impact basin in the Northern Hemisphere of Mars, spanning 10,600 by 8,500 kilometres (6,600 by 5,300 mi), or roughly four times the size of the Moon's South Pole–Aitken basin, which would be the largest impact basin yet discovered if confirmed. It has been hypothesized that the basin was formed when Mars was struck by a Pluto-sized body about four billion years ago. The event, thought to be the cause of the Martian hemispheric dichotomy, created the smooth Borealis basin that covers 40% of the planet. A 2023 study shows evidence, based on the orbital inclination of Deimos (a small moon of Mars), that Mars may once have had a ring system 3.5 billion years to 4 billion years ago. This ring system may have been formed from a moon, 20 times more massive than Phobos, orbiting Mars billions of years ago; and Phobos would be a remnant of that ring. Epochs: The geological history of Mars can be split into many periods, but the following are the three primary periods: Geological activity is still taking place on Mars. The Athabasca Valles is home to sheet-like lava flows created about 200 million years ago. Water flows in the grabens called the Cerberus Fossae occurred less than 20 million years ago, indicating equally recent volcanic intrusions. The Mars Reconnaissance Orbiter has captured images of avalanches. Physical characteristics Mars is approximately half the diameter of Earth or twice that of the Moon, with a surface area only slightly less than the total area of Earth's dry land. Mars is less dense than Earth, having about 15% of Earth's volume and 11% of Earth's mass, resulting in about 38% of Earth's surface gravity. Mars is the only presently known example of a desert planet, a rocky planet with a surface akin to that of Earth's deserts. The red-orange appearance of the Martian surface is caused by iron(III) oxide (nanophase Fe2O3) and the iron(III) oxide-hydroxide mineral goethite. It can look like butterscotch; other common surface colors include golden, brown, tan, and greenish, depending on the minerals present. Like Earth, Mars is differentiated into a dense metallic core overlaid by less dense rocky layers. The outermost layer is the crust, which is on average about 42–56 kilometres (26–35 mi) thick, with a minimum thickness of 6 kilometres (3.7 mi) in Isidis Planitia, and a maximum thickness of 117 kilometres (73 mi) in the southern Tharsis plateau. For comparison, Earth's crust averages 27.3 ± 4.8 km in thickness. The most abundant elements in the Martian crust are silicon, oxygen, iron, magnesium, aluminum, calcium, and potassium. Mars is confirmed to be seismically active; in 2019, it was reported that InSight had detected and recorded over 450 marsquakes and related events. Beneath the crust is a silicate mantle responsible for many of the tectonic and volcanic features on the planet's surface. The upper Martian mantle is a low-velocity zone, where the velocity of seismic waves is lower than surrounding depth intervals. The mantle appears to be rigid down to the depth of about 250 km, giving Mars a very thick lithosphere compared to Earth. Below this the mantle gradually becomes more ductile, and the seismic wave velocity starts to grow again. The Martian mantle does not appear to have a thermally insulating layer analogous to Earth's lower mantle; instead, below 1050 km in depth, it becomes mineralogically similar to Earth's transition zone. At the bottom of the mantle lies a basal liquid silicate layer approximately 150–180 km thick. The Martian mantle appears to be highly heterogenous, with dense fragments up to 4 km across, likely injected deep into the planet by colossal impacts ~4.5 billion years ago; high-frequency waves from eight marsquakes slowed as they passed these localized regions, and modeling indicates the heterogeneities are compositionally distinct debris preserved because Mars lacks plate tectonics and has a sluggishly convecting interior that prevents complete homogenization. Mars's iron and nickel core is at least partially molten, and may have a solid inner core. It is around half of Mars's radius, approximately 1650–1675 km, and is enriched in light elements such as sulfur, oxygen, carbon, and hydrogen. The temperature of the core is estimated to be 2000–2400 K, compared to 5400–6230 K for Earth's solid inner core. In 2025, based on data from the InSight lander, a group of researchers reported the detection of a solid inner core 613 kilometres (381 mi) ± 67 kilometres (42 mi) in radius. Mars is a terrestrial planet with a surface that consists of minerals containing silicon and oxygen, metals, and other elements that typically make up rock. The Martian surface is primarily composed of tholeiitic basalt, although parts are more silica-rich than typical basalt and may be similar to andesitic rocks on Earth, or silica glass. Regions of low albedo suggest concentrations of plagioclase feldspar, with northern low albedo regions displaying higher than normal concentrations of sheet silicates and high-silicon glass. Parts of the southern highlands include detectable amounts of high-calcium pyroxenes. Localized concentrations of hematite and olivine have been found. Much of the surface is deeply covered by finely grained iron(III) oxide dust. The Phoenix lander returned data showing Martian soil to be slightly alkaline and containing elements such as magnesium, sodium, potassium and chlorine. These nutrients are found in soils on Earth, and are necessary for plant growth. Experiments performed by the lander showed that the Martian soil has a basic pH of 7.7, and contains 0.6% perchlorate by weight, concentrations that are toxic to humans. Streaks are common across Mars and new ones appear frequently on steep slopes of craters, troughs, and valleys. The streaks are dark at first and get lighter with age. The streaks can start in a tiny area, then spread out for hundreds of metres. They have been seen to follow the edges of boulders and other obstacles in their path. The commonly accepted hypotheses include that they are dark underlying layers of soil revealed after avalanches of bright dust or dust devils. Several other explanations have been put forward, including those that involve water or even the growth of organisms. Environmental radiation levels on the surface are on average 0.64 millisieverts of radiation per day, and significantly less than the radiation of 1.84 millisieverts per day or 22 millirads per day during the flight to and from Mars. For comparison the radiation levels in low Earth orbit, where Earth's space stations orbit, are around 0.5 millisieverts of radiation per day. Hellas Planitia has the lowest surface radiation at about 0.342 millisieverts per day, featuring lava tubes southwest of Hadriacus Mons with potentially levels as low as 0.064 millisieverts per day, comparable to radiation levels during flights on Earth. Although Mars has no evidence of a structured global magnetic field, observations show that parts of the planet's crust have been magnetized, suggesting that alternating polarity reversals of its dipole field have occurred in the past. This paleomagnetism of magnetically susceptible minerals is similar to the alternating bands found on Earth's ocean floors. One hypothesis, published in 1999 and re-examined in October 2005 (with the help of the Mars Global Surveyor), is that these bands suggest plate tectonic activity on Mars four billion years ago, before the planetary dynamo ceased to function and the planet's magnetic field faded. Geography and features Although better remembered for mapping the Moon, Johann Heinrich von Mädler and Wilhelm Beer were the first areographers. They began by establishing that most of Mars's surface features were permanent and by more precisely determining the planet's rotation period. In 1840, Mädler combined ten years of observations and drew the first map of Mars. Features on Mars are named from a variety of sources. Albedo features are named for classical mythology. Craters larger than roughly 50 km are named for deceased scientists and writers and others who have contributed to the study of Mars. Smaller craters are named for towns and villages of the world with populations of less than 100,000. Large valleys are named for the word "Mars" or "star" in various languages; smaller valleys are named for rivers. Large albedo features retain many of the older names but are often updated to reflect new knowledge of the nature of the features. For example, Nix Olympica (the snows of Olympus) has become Olympus Mons (Mount Olympus). The surface of Mars as seen from Earth is divided into two kinds of areas, with differing albedo. The paler plains covered with dust and sand rich in reddish iron oxides were once thought of as Martian "continents" and given names like Arabia Terra (land of Arabia) or Amazonis Planitia (Amazonian plain). The dark features were thought to be seas, hence their names Mare Erythraeum, Mare Sirenum and Aurorae Sinus. The largest dark feature seen from Earth is Syrtis Major Planum. The permanent northern polar ice cap is named Planum Boreum. The southern cap is called Planum Australe. Mars's equator is defined by its rotation, but the location of its Prime Meridian was specified, as was Earth's (at Greenwich), by choice of an arbitrary point; Mädler and Beer selected a line for their first maps of Mars in 1830. After the spacecraft Mariner 9 provided extensive imagery of Mars in 1972, a small crater (later called Airy-0), located in the Sinus Meridiani ("Middle Bay" or "Meridian Bay"), was chosen by Merton E. Davies, Harold Masursky, and Gérard de Vaucouleurs for the definition of 0.0° longitude to coincide with the original selection. Because Mars has no oceans, and hence no "sea level", a zero-elevation surface had to be selected as a reference level; this is called the areoid of Mars, analogous to the terrestrial geoid. Zero altitude was defined by the height at which there is 610.5 Pa (6.105 mbar) of atmospheric pressure. This pressure corresponds to the triple point of water, and it is about 0.6% of the sea level surface pressure on Earth (0.006 atm). For mapping purposes, the United States Geological Survey divides the surface of Mars into thirty cartographic quadrangles, each named for a classical albedo feature it contains. In April 2023, The New York Times reported an updated global map of Mars based on images from the Hope spacecraft. A related, but much more detailed, global Mars map was released by NASA on 16 April 2023. The vast upland region Tharsis contains several massive volcanoes, which include the shield volcano Olympus Mons. The edifice is over 600 km (370 mi) wide. Because the mountain is so large, with complex structure at its edges, giving a definite height to it is difficult. Its local relief, from the foot of the cliffs which form its northwest margin to its peak, is over 21 km (13 mi), a little over twice the height of Mauna Kea as measured from its base on the ocean floor. The total elevation change from the plains of Amazonis Planitia, over 1,000 km (620 mi) to the northwest, to the summit approaches 26 km (16 mi), roughly three times the height of Mount Everest, which in comparison stands at just over 8.8 kilometres (5.5 mi). Consequently, Olympus Mons is either the tallest or second-tallest mountain in the Solar System; the only known mountain which might be taller is the Rheasilvia peak on the asteroid Vesta, at 20–25 km (12–16 mi). The dichotomy of Martian topography is striking: northern plains flattened by lava flows contrast with the southern highlands, pitted and cratered by ancient impacts. It is possible that, four billion years ago, the Northern Hemisphere of Mars was struck by an object one-tenth to two-thirds the size of Earth's Moon. If this is the case, the Northern Hemisphere of Mars would be the site of an impact crater 10,600 by 8,500 kilometres (6,600 by 5,300 mi) in size, or roughly the area of Europe, Asia, and Australia combined, surpassing Utopia Planitia and the Moon's South Pole–Aitken basin as the largest impact crater in the Solar System. Mars is scarred by 43,000 impact craters with a diameter of 5 kilometres (3.1 mi) or greater. The largest exposed crater is Hellas, which is 2,300 kilometres (1,400 mi) wide and 7,000 metres (23,000 ft) deep, and is a light albedo feature clearly visible from Earth. There are other notable impact features, such as Argyre, which is around 1,800 kilometres (1,100 mi) in diameter, and Isidis, which is around 1,500 kilometres (930 mi) in diameter. Due to the smaller mass and size of Mars, the probability of an object colliding with the planet is about half that of Earth. Mars is located closer to the asteroid belt, so it has an increased chance of being struck by materials from that source. Mars is more likely to be struck by short-period comets, i.e., those that lie within the orbit of Jupiter. Martian craters can[discuss] have a morphology that suggests the ground became wet after the meteor impact. The large canyon, Valles Marineris (Latin for 'Mariner Valleys, also known as Agathodaemon in the old canal maps), has a length of 4,000 kilometres (2,500 mi) and a depth of up to 7 kilometres (4.3 mi). The length of Valles Marineris is equivalent to the length of Europe and extends across one-fifth the circumference of Mars. By comparison, the Grand Canyon on Earth is only 446 kilometres (277 mi) long and nearly 2 kilometres (1.2 mi) deep. Valles Marineris was formed due to the swelling of the Tharsis area, which caused the crust in the area of Valles Marineris to collapse. In 2012, it was proposed that Valles Marineris is not just a graben, but a plate boundary where 150 kilometres (93 mi) of transverse motion has occurred, making Mars a planet with possibly a two-tectonic plate arrangement. Images from the Thermal Emission Imaging System (THEMIS) aboard NASA's Mars Odyssey orbiter have revealed seven possible cave entrances on the flanks of the volcano Arsia Mons. The caves, named after loved ones of their discoverers, are collectively known as the "seven sisters". Cave entrances measure from 100 to 252 metres (328 to 827 ft) wide and they are estimated to be at least 73 to 96 metres (240 to 315 ft) deep. Because light does not reach the floor of most of the caves, they may extend much deeper than these lower estimates and widen below the surface. "Dena" is the only exception; its floor is visible and was measured to be 130 metres (430 ft) deep. The interiors of these caverns may be protected from micrometeoroids, UV radiation, solar flares and high energy particles that bombard the planet's surface. Martian geysers (or CO2 jets) are putative sites of small gas and dust eruptions that occur in the south polar region of Mars during the spring thaw. "Dark dune spots" and "spiders" – or araneiforms – are the two most visible types of features ascribed to these eruptions. Similarly sized dust will settle from the thinner Martian atmosphere sooner than it would on Earth. For example, the dust suspended by the 2001 global dust storms on Mars only remained in the Martian atmosphere for 0.6 years, while the dust from Mount Pinatubo took about two years to settle. However, under current Martian conditions, the mass movements involved are generally much smaller than on Earth. Even the 2001 global dust storms on Mars moved only the equivalent of a very thin dust layer – about 3 μm thick if deposited with uniform thickness between 58° north and south of the equator. Dust deposition at the two rover sites has proceeded at a rate of about the thickness of a grain every 100 sols. Atmosphere Mars lost its magnetosphere 4 billion years ago, possibly because of numerous asteroid strikes, so the solar wind interacts directly with the Martian ionosphere, lowering the atmospheric density by stripping away atoms from the outer layer. Both Mars Global Surveyor and Mars Express have detected ionized atmospheric particles trailing off into space behind Mars, and this atmospheric loss is being studied by the MAVEN orbiter. Compared to Earth, the atmosphere of Mars is quite rarefied. Atmospheric pressure on the surface today ranges from a low of 30 Pa (0.0044 psi) on Olympus Mons to over 1,155 Pa (0.1675 psi) in Hellas Planitia, with a mean pressure at the surface level of 600 Pa (0.087 psi). The highest atmospheric density on Mars is equal to that found 35 kilometres (22 mi) above Earth's surface. The resulting mean surface pressure is only 0.6% of Earth's 101.3 kPa (14.69 psi). The scale height of the atmosphere is about 10.8 kilometres (6.7 mi), which is higher than Earth's 6 kilometres (3.7 mi), because the surface gravity of Mars is only about 38% of Earth's. The atmosphere of Mars consists of about 96% carbon dioxide, 1.93% argon and 1.89% nitrogen along with traces of oxygen and water. The atmosphere is quite dusty, containing particulates about 1.5 μm in diameter which give the Martian sky a tawny color when seen from the surface. It may take on a pink hue due to iron oxide particles suspended in it. Despite repeated detections of methane on Mars, there is no scientific consensus as to its origin. One suggestion is that methane exists on Mars and that its concentration fluctuates seasonally. The existence of methane could be produced by non-biological process such as serpentinization involving water, carbon dioxide, and the mineral olivine, which is known to be common on Mars, or by Martian life. Compared to Earth, its higher concentration of atmospheric CO2 and lower surface pressure may be why sound is attenuated more on Mars, where natural sources are rare apart from the wind. Using acoustic recordings collected by the Perseverance rover, researchers concluded that the speed of sound there is approximately 240 m/s for frequencies below 240 Hz, and 250 m/s for those above. Auroras have been detected on Mars. Because Mars lacks a global magnetic field, the types and distribution of auroras there differ from those on Earth; rather than being mostly restricted to polar regions as is the case on Earth, a Martian aurora can encompass the planet. In September 2017, NASA reported radiation levels on the surface of the planet Mars were temporarily doubled, and were associated with an aurora 25 times brighter than any observed earlier, due to a massive, and unexpected, solar storm in the middle of the month. Mars has seasons, alternating between its northern and southern hemispheres, similar to on Earth. Additionally the orbit of Mars has, compared to Earth's, a large eccentricity and approaches perihelion when it is summer in its southern hemisphere and winter in its northern, and aphelion when it is winter in its southern hemisphere and summer in its northern. As a result, the seasons in its southern hemisphere are more extreme and the seasons in its northern are milder than would otherwise be the case. The summer temperatures in the south can be warmer than the equivalent summer temperatures in the north by up to 30 °C (54 °F). Martian surface temperatures vary from lows of about −110 °C (−166 °F) to highs of up to 35 °C (95 °F) in equatorial summer. The wide range in temperatures is due to the thin atmosphere which cannot store much solar heat, the low atmospheric pressure (about 1% that of the atmosphere of Earth), and the low thermal inertia of Martian soil. The planet is 1.52 times as far from the Sun as Earth, resulting in just 43% of the amount of sunlight. Mars has the largest dust storms in the Solar System, reaching speeds of over 160 km/h (100 mph). These can vary from a storm over a small area, to gigantic storms that cover the entire planet. They tend to occur when Mars is closest to the Sun, and have been shown to increase global temperature. Seasons also produce dry ice covering polar ice caps. Hydrology While Mars contains water in larger amounts, most of it is dust covered water ice at the Martian polar ice caps. The volume of water ice in the south polar ice cap, if melted, would be enough to cover most of the surface of the planet with a depth of 11 metres (36 ft). Water in its liquid form cannot persist on the surface due to Mars's low atmospheric pressure, which is less than 1% that of Earth. Only at the lowest of elevations are the pressure and temperature high enough for liquid water to exist for short periods. Although little water is present in the atmosphere, there is enough to produce clouds of water ice and different cases of snow and frost, often mixed with snow of carbon dioxide dry ice. Landforms visible on Mars strongly suggest that liquid water has existed on the planet's surface. Huge linear swathes of scoured ground, known as outflow channels, cut across the surface in about 25 places. These are thought to be a record of erosion caused by the catastrophic release of water from subsurface aquifers, though some of these structures have been hypothesized to result from the action of glaciers or lava. One of the larger examples, Ma'adim Vallis, is 700 kilometres (430 mi) long, much greater than the Grand Canyon, with a width of 20 kilometres (12 mi) and a depth of 2 kilometres (1.2 mi) in places. It is thought to have been carved by flowing water early in Mars's history. The youngest of these channels is thought to have formed only a few million years ago. Elsewhere, particularly on the oldest areas of the Martian surface, finer-scale, dendritic networks of valleys are spread across significant proportions of the landscape. Features of these valleys and their distribution strongly imply that they were carved by runoff resulting from precipitation in early Mars history. Subsurface water flow and groundwater sapping may play important subsidiary roles in some networks, but precipitation was probably the root cause of the incision in almost all cases. Along craters and canyon walls, there are thousands of features that appear similar to terrestrial gullies. The gullies tend to be in the highlands of the Southern Hemisphere and face the Equator; all are poleward of 30° latitude. A number of authors have suggested that their formation process involves liquid water, probably from melting ice, although others have argued for formation mechanisms involving carbon dioxide frost or the movement of dry dust. No partially degraded gullies have formed by weathering and no superimposed impact craters have been observed, indicating that these are young features, possibly still active. Other geological features, such as deltas and alluvial fans preserved in craters, are further evidence for warmer, wetter conditions at an interval or intervals in earlier Mars history. Such conditions necessarily require the widespread presence of crater lakes across a large proportion of the surface, for which there is independent mineralogical, sedimentological and geomorphological evidence. Further evidence that liquid water once existed on the surface of Mars comes from the detection of specific minerals such as hematite and goethite, both of which sometimes form in the presence of water. The chemical signature of water vapor on Mars was first unequivocally demonstrated in 1963 by spectroscopy using an Earth-based telescope. In 2004, Opportunity detected the mineral jarosite. This forms only in the presence of acidic water, showing that water once existed on Mars. The Spirit rover found concentrated deposits of silica in 2007 that indicated wet conditions in the past, and in December 2011, the mineral gypsum, which also forms in the presence of water, was found on the surface by NASA's Mars rover Opportunity. It is estimated that the amount of water in the upper mantle of Mars, represented by hydroxyl ions contained within Martian minerals, is equal to or greater than that of Earth at 50–300 parts per million of water, which is enough to cover the entire planet to a depth of 200–1,000 metres (660–3,280 ft). On 18 March 2013, NASA reported evidence from instruments on the Curiosity rover of mineral hydration, likely hydrated calcium sulfate, in several rock samples including the broken fragments of "Tintina" rock and "Sutton Inlier" rock as well as in veins and nodules in other rocks like "Knorr" rock and "Wernicke" rock. Analysis using the rover's DAN instrument provided evidence of subsurface water, amounting to as much as 4% water content, down to a depth of 60 centimetres (24 in), during the rover's traverse from the Bradbury Landing site to the Yellowknife Bay area in the Glenelg terrain. In September 2015, NASA announced that they had found strong evidence of hydrated brine flows in recurring slope lineae, based on spectrometer readings of the darkened areas of slopes. These streaks flow downhill in Martian summer, when the temperature is above −23 °C, and freeze at lower temperatures. These observations supported earlier hypotheses, based on timing of formation and their rate of growth, that these dark streaks resulted from water flowing just below the surface. However, later work suggested that the lineae may be dry, granular flows instead, with at most a limited role for water in initiating the process. A definitive conclusion about the presence, extent, and role of liquid water on the Martian surface remains elusive. Researchers suspect much of the low northern plains of the planet were covered with an ocean hundreds of meters deep, though this theory remains controversial. In March 2015, scientists stated that such an ocean might have been the size of Earth's Arctic Ocean. This finding was derived from the ratio of protium to deuterium in the modern Martian atmosphere compared to that ratio on Earth. The amount of Martian deuterium (D/H = 9.3 ± 1.7 10−4) is five to seven times the amount on Earth (D/H = 1.56 10−4), suggesting that ancient Mars had significantly higher levels of water. Results from the Curiosity rover had previously found a high ratio of deuterium in Gale Crater, though not significantly high enough to suggest the former presence of an ocean. Other scientists caution that these results have not been confirmed, and point out that Martian climate models have not yet shown that the planet was warm enough in the past to support bodies of liquid water. Near the northern polar cap is the 81.4 kilometres (50.6 mi) wide Korolev Crater, which the Mars Express orbiter found to be filled with approximately 2,200 cubic kilometres (530 cu mi) of water ice. In November 2016, NASA reported finding a large amount of underground ice in the Utopia Planitia region. The volume of water detected has been estimated to be equivalent to the volume of water in Lake Superior (which is 12,100 cubic kilometers). During observations from 2018 through 2021, the ExoMars Trace Gas Orbiter spotted indications of water, probably subsurface ice, in the Valles Marineris canyon system. Orbital motion Mars's average distance from the Sun is roughly 230 million km (143 million mi), and its orbital period is 687 (Earth) days. The solar day (or sol) on Mars is only slightly longer than an Earth day: 24 hours, 39 minutes, and 35.244 seconds. A Martian year is equal to 1.8809 Earth years, or 1 year, 320 days, and 18.2 hours. The gravitational potential difference and thus the delta-v needed to transfer between Mars and Earth is the second lowest for Earth. The axial tilt of Mars is 25.19° relative to its orbital plane, which is similar to the axial tilt of Earth. As a result, Mars has seasons like Earth, though on Mars they are nearly twice as long because its orbital period is that much longer. In the present day, the orientation of the north pole of Mars is close to the star Deneb. Mars has a relatively pronounced orbital eccentricity of about 0.09; of the seven other planets in the Solar System, only Mercury has a larger orbital eccentricity. It is known that in the past, Mars has had a much more circular orbit. At one point, 1.35 million Earth years ago, Mars had an eccentricity of roughly 0.002, much less than that of Earth today. Mars's cycle of eccentricity is 96,000 Earth years compared to Earth's cycle of 100,000 years. Mars has its closest approach to Earth (opposition) in a synodic period of 779.94 days. It should not be confused with Mars conjunction, where the Earth and Mars are at opposite sides of the Solar System and form a straight line crossing the Sun. The average time between the successive oppositions of Mars, its synodic period, is 780 days; but the number of days between successive oppositions can range from 764 to 812. The distance at close approach varies between about 54 and 103 million km (34 and 64 million mi) due to the planets' elliptical orbits, which causes comparable variation in angular size. At their furthest Mars and Earth can be as far as 401 million km (249 million mi) apart. Mars comes into opposition from Earth every 2.1 years. The planets come into opposition near Mars's perihelion in 2003, 2018 and 2035, with the 2020 and 2033 events being particularly close to perihelic opposition. The mean apparent magnitude of Mars is +0.71 with a standard deviation of 1.05. Because the orbit of Mars is eccentric, the magnitude at opposition from the Sun can range from about −3.0 to −1.4. The minimum brightness is magnitude +1.86 when the planet is near aphelion and in conjunction with the Sun. At its brightest, Mars (along with Jupiter) is second only to Venus in apparent brightness. Mars usually appears distinctly yellow, orange, or red. When farthest away from Earth, it is more than seven times farther away than when it is closest. Mars is usually close enough for particularly good viewing once or twice at 15-year or 17-year intervals. Optical ground-based telescopes are typically limited to resolving features about 300 kilometres (190 mi) across when Earth and Mars are closest because of Earth's atmosphere. As Mars approaches opposition, it begins a period of retrograde motion, which means it will appear to move backwards in a looping curve with respect to the background stars. This retrograde motion lasts for about 72 days, and Mars reaches its peak apparent brightness in the middle of this interval. Moons Mars has two relatively small (compared to Earth's) natural moons, Phobos (about 22 km (14 mi) in diameter) and Deimos (about 12 km (7.5 mi) in diameter), which orbit at 9,376 km (5,826 mi) and 23,460 km (14,580 mi) around the planet. The origin of both moons is unclear, although a popular theory states that they were asteroids captured into Martian orbit. Both satellites were discovered in 1877 by Asaph Hall and were named after the characters Phobos (the deity of panic and fear) and Deimos (the deity of terror and dread), twins from Greek mythology who accompanied their father Ares, god of war, into battle. Mars was the Roman equivalent to Ares. In modern Greek, the planet retains its ancient name Ares (Aris: Άρης). From the surface of Mars, the motions of Phobos and Deimos appear different from that of the Earth's satellite, the Moon. Phobos rises in the west, sets in the east, and rises again in just 11 hours. Deimos, being only just outside synchronous orbit – where the orbital period would match the planet's period of rotation – rises as expected in the east, but slowly. Because the orbit of Phobos is below a synchronous altitude, tidal forces from Mars are gradually lowering its orbit. In about 50 million years, it could either crash into Mars's surface or break up into a ring structure around the planet. The origin of the two satellites is not well understood. Their low albedo and carbonaceous chondrite composition have been regarded as similar to asteroids, supporting a capture theory. The unstable orbit of Phobos would seem to point toward a relatively recent capture. But both have circular orbits near the equator, which is unusual for captured objects, and the required capture dynamics are complex. Accretion early in the history of Mars is plausible, but would not account for a composition resembling asteroids rather than Mars itself, if that is confirmed. Mars may have yet-undiscovered moons, smaller than 50 to 100 metres (160 to 330 ft) in diameter, and a dust ring is predicted to exist between Phobos and Deimos. A third possibility for their origin as satellites of Mars is the involvement of a third body or a type of impact disruption. More-recent lines of evidence for Phobos having a highly porous interior, and suggesting a composition containing mainly phyllosilicates and other minerals known from Mars, point toward an origin of Phobos from material ejected by an impact on Mars that reaccreted in Martian orbit, similar to the prevailing theory for the origin of Earth's satellite. Although the visible and near-infrared (VNIR) spectra of the moons of Mars resemble those of outer-belt asteroids, the thermal infrared spectra of Phobos are reported to be inconsistent with chondrites of any class. It is also possible that Phobos and Deimos were fragments of an older moon, formed by debris from a large impact on Mars, and then destroyed by a more recent impact upon the satellite. More recently, a study conducted by a team of researchers from multiple countries suggests that a lost moon, at least fifteen times the size of Phobos, may have existed in the past. By analyzing rocks which point to tidal processes on the planet, it is possible that these tides may have been regulated by a past moon. Human observations and exploration The history of observations of Mars is marked by oppositions of Mars when the planet is closest to Earth and hence is most easily visible, which occur every couple of years. Even more notable are the perihelic oppositions of Mars, which are distinguished because Mars is close to perihelion, making it even closer to Earth. The ancient Sumerians named Mars Nergal, the god of war and plague. During Sumerian times, Nergal was a minor deity of little significance, but, during later times, his main cult center was the city of Nineveh. In Mesopotamian texts, Mars is referred to as the "star of judgement of the fate of the dead". The existence of Mars as a wandering object in the night sky was also recorded by the ancient Egyptian astronomers and, by 1534 BCE, they were familiar with the retrograde motion of the planet. By the period of the Neo-Babylonian Empire, the Babylonian astronomers were making regular records of the positions of the planets and systematic observations of their behavior. For Mars, they knew that the planet made 37 synodic periods, or 42 circuits of the zodiac, every 79 years. They invented arithmetic methods for making minor corrections to the predicted positions of the planets. In Ancient Greece, the planet was known as Πυρόεις. Commonly, the Greek name for the planet now referred to as Mars, was Ares. It was the Romans who named the planet Mars, for their god of war, often represented by the sword and shield of the planet's namesake. In the fourth century BCE, Aristotle noted that Mars disappeared behind the Moon during an occultation, indicating that the planet was farther away. Ptolemy, a Greek living in Alexandria, attempted to address the problem of the orbital motion of Mars. Ptolemy's model and his collective work on astronomy was presented in the multi-volume collection later called the Almagest (from the Arabic for "greatest"), which became the authoritative treatise on Western astronomy for the next fourteen centuries. Literature from ancient China confirms that Mars was known by Chinese astronomers by no later than the fourth century BCE. In the East Asian cultures, Mars is traditionally referred to as the "fire star" (火星) based on the Wuxing system. In 1609 Johannes Kepler published a 10 year study of Martian orbit, using the diurnal parallax of Mars, measured by Tycho Brahe, to make a preliminary calculation of the relative distance to the planet. From Brahe's observations of Mars, Kepler deduced that the planet orbited the Sun not in a circle, but in an ellipse. Moreover, Kepler showed that Mars sped up as it approached the Sun and slowed down as it moved farther away, in a manner that later physicists would explain as a consequence of the conservation of angular momentum.: 433–437 In 1610 the first use of a telescope for astronomical observation, including Mars, was performed by Italian astronomer Galileo Galilei. With the telescope the diurnal parallax of Mars was again measured in an effort to determine the Sun-Earth distance. This was first performed by Giovanni Domenico Cassini in 1672. The early parallax measurements were hampered by the quality of the instruments. The only occultation of Mars by Venus observed was that of 13 October 1590, seen by Michael Maestlin at Heidelberg. By the 19th century, the resolution of telescopes reached a level sufficient for surface features to be identified. On 5 September 1877, a perihelic opposition to Mars occurred. The Italian astronomer Giovanni Schiaparelli used a 22-centimetre (8.7 in) telescope in Milan to help produce the first detailed map of Mars. These maps notably contained features he called canali, which, with the possible exception of the natural canyon Valles Marineris, were later shown to be an optical illusion. These canali were supposedly long, straight lines on the surface of Mars, to which he gave names of famous rivers on Earth. His term, which means "channels" or "grooves", was popularly mistranslated in English as "canals". Influenced by the observations, the orientalist Percival Lowell founded an observatory which had 30- and 45-centimetre (12- and 18-in) telescopes. The observatory was used for the exploration of Mars during the last good opportunity in 1894, and the following less favorable oppositions. He published several books on Mars and life on the planet, which had a great influence on the public. The canali were independently observed by other astronomers, like Henri Joseph Perrotin and Louis Thollon in Nice, using one of the largest telescopes of that time. The seasonal changes (consisting of the diminishing of the polar caps and the dark areas formed during Martian summers) in combination with the canals led to speculation about life on Mars, and it was a long-held belief that Mars contained vast seas and vegetation. As bigger telescopes were used, fewer long, straight canali were observed. During observations in 1909 by Antoniadi with an 84-centimetre (33 in) telescope, irregular patterns were observed, but no canali were seen. The first spacecraft from Earth to visit Mars was Mars 1 of the Soviet Union, which flew by in 1963, but contact was lost en route. NASA's Mariner 4 followed and became the first spacecraft to successfully transmit from Mars; launched on 28 November 1964, it made its closest approach to the planet on 15 July 1965. Mariner 4 detected the weak Martian radiation belt, measured at about 0.1% that of Earth, and captured the first images of another planet from deep space. Once spacecraft visited the planet during the 1960s and 1970s, many previous concepts of Mars were radically broken. After the results of the Viking life-detection experiments, the hypothesis of a dead planet was generally accepted. The data from Mariner 9 and Viking allowed better maps of Mars to be made. Until 1997 and after Viking 1 shut down in 1982, Mars was only visited by three unsuccessful probes, two flying past without contact (Phobos 1, 1988; Mars Observer, 1993), and one (Phobos 2 1989) malfunctioning in orbit before reaching its destination Phobos. In 1997 Mars Pathfinder became the first successful rover mission beyond the Moon and started together with Mars Global Surveyor (operated until late 2006) an uninterrupted active robotic presence at Mars that has lasted until today. It produced complete, extremely detailed maps of the Martian topography, magnetic field and surface minerals. Starting with these missions a range of new improved crewless spacecraft, including orbiters, landers, and rovers, have been sent to Mars, with successful missions by the NASA (United States), Jaxa (Japan), ESA, United Kingdom, ISRO (India), Roscosmos (Russia), the United Arab Emirates, and CNSA (China) to study the planet's surface, climate, and geology, uncovering the different elements of the history and dynamic of the hydrosphere of Mars and possible traces of ancient life. As of 2023[update], Mars is host to ten functioning spacecraft. Eight are in orbit: 2001 Mars Odyssey, Mars Express, Mars Reconnaissance Orbiter, MAVEN, ExoMars Trace Gas Orbiter, the Hope orbiter, and the Tianwen-1 orbiter. Another two are on the surface: the Mars Science Laboratory Curiosity rover and the Perseverance rover. Collected maps are available online at websites including Google Mars. NASA provides two online tools: Mars Trek, which provides visualizations of the planet using data from 50 years of exploration, and Experience Curiosity, which simulates traveling on Mars in 3-D with Curiosity. Planned missions to Mars include: As of February 2024[update], debris from these types of missions has reached over seven tons. Most of it consists of crashed and inactive spacecraft as well as discarded components. In April 2024, NASA selected several companies to begin studies on providing commercial services to further enable robotic science on Mars. Key areas include establishing telecommunications, payload delivery and surface imaging. Habitability and habitation During the late 19th century, it was widely accepted in the astronomical community that Mars had life-supporting qualities, including the presence of oxygen and water. However, in 1894 W. W. Campbell at Lick Observatory observed the planet and found that "if water vapor or oxygen occur in the atmosphere of Mars it is in quantities too small to be detected by spectroscopes then available". That observation contradicted many of the measurements of the time and was not widely accepted. Campbell and V. M. Slipher repeated the study in 1909 using better instruments, but with the same results. It was not until the findings were confirmed by W. S. Adams in 1925 that the myth of the Earth-like habitability of Mars was finally broken. However, even in the 1960s, articles were published on Martian biology, putting aside explanations other than life for the seasonal changes on Mars. The current understanding of planetary habitability – the ability of a world to develop environmental conditions favorable to the emergence of life – favors planets that have liquid water on their surface. Most often this requires the orbit of a planet to lie within the habitable zone, which for the Sun is estimated to extend from within the orbit of Earth to about that of Mars. During perihelion, Mars dips inside this region, but Mars's thin (low-pressure) atmosphere prevents liquid water from existing over large regions for extended periods. The past flow of liquid water demonstrates the planet's potential for habitability. Recent evidence has suggested that any water on the Martian surface may have been too salty and acidic to support regular terrestrial life. The environmental conditions on Mars are a challenge to sustaining organic life: the planet has little heat transfer across its surface, it has poor insulation against bombardment by the solar wind due to the absence of a magnetosphere and has insufficient atmospheric pressure to retain water in a liquid form (water instead sublimes to a gaseous state). Mars is nearly, or perhaps totally, geologically dead; the end of volcanic activity has apparently stopped the recycling of chemicals and minerals between the surface and interior of the planet. Evidence suggests that the planet was once significantly more habitable than it is today, but whether living organisms ever existed there remains unknown. The Viking probes of the mid-1970s carried experiments designed to detect microorganisms in Martian soil at their respective landing sites and had positive results, including a temporary increase in CO2 production on exposure to water and nutrients. This sign of life was later disputed by scientists, resulting in a continuing debate, with NASA scientist Gilbert Levin asserting that Viking may have found life. A 2014 analysis of Martian meteorite EETA79001 found chlorate, perchlorate, and nitrate ions in sufficiently high concentrations to suggest that they are widespread on Mars. UV and X-ray radiation would turn chlorate and perchlorate ions into other, highly reactive oxychlorines, indicating that any organic molecules would have to be buried under the surface to survive. Small quantities of methane and formaldehyde detected by Mars orbiters are both claimed to be possible evidence for life, as these chemical compounds would quickly break down in the Martian atmosphere. Alternatively, these compounds may instead be replenished by volcanic or other geological means, such as serpentinite. Impact glass, formed by the impact of meteors, which on Earth can preserve signs of life, has also been found on the surface of the impact craters on Mars. Likewise, the glass in impact craters on Mars could have preserved signs of life, if life existed at the site. The Cheyava Falls rock discovered on Mars in June 2024 has been designated by NASA as a "potential biosignature" and was core sampled by the Perseverance rover for possible return to Earth and further examination. Although highly intriguing, no definitive final determination on a biological or abiotic origin of this rock can be made with the data currently available. Several plans for a human mission to Mars have been proposed, but none have come to fruition. The NASA Authorization Act of 2017 directed NASA to study the feasibility of a crewed Mars mission in the early 2030s; the resulting report concluded that this would be unfeasible. In addition, in 2021, China was planning to send a crewed Mars mission in 2033. Privately held companies such as SpaceX have also proposed plans to send humans to Mars, with the eventual goal to settle on the planet. As of 2024, SpaceX has proceeded with the development of the Starship launch vehicle with the goal of Mars colonization. In plans shared with the company in April 2024, Elon Musk envisions the beginning of a Mars colony within the next twenty years. This would be enabled by the planned mass manufacturing of Starship and initially sustained by resupply from Earth, and in situ resource utilization on Mars, until the Mars colony reaches full self sustainability. Any future human mission to Mars will likely take place within the optimal Mars launch window, which occurs every 26 months. The moon Phobos has been proposed as an anchor point for a space elevator. Besides national space agencies and space companies, groups such as the Mars Society and The Planetary Society advocate for human missions to Mars. In culture Mars is named after the Roman god of war (Greek Ares), but was also associated with the demi-god Heracles (Roman Hercules) by ancient Greek astronomers, as detailed by Aristotle. This association between Mars and war dates back at least to Babylonian astronomy, in which the planet was named for the god Nergal, deity of war and destruction. It persisted into modern times, as exemplified by Gustav Holst's orchestral suite The Planets, whose famous first movement labels Mars "The Bringer of War". The planet's symbol, a circle with a spear pointing out to the upper right, is also used as a symbol for the male gender. The symbol dates from at least the 11th century, though a possible predecessor has been found in the Greek Oxyrhynchus Papyri. The idea that Mars was populated by intelligent Martians became widespread in the late 19th century. Schiaparelli's "canali" observations combined with Percival Lowell's books on the subject put forward the standard notion of a planet that was a drying, cooling, dying world with ancient civilizations constructing irrigation works. Many other observations and proclamations by notable personalities added to what has been termed "Mars Fever". In the present day, high-resolution mapping of the surface of Mars has revealed no artifacts of habitation, but pseudoscientific speculation about intelligent life on Mars still continues. Reminiscent of the canali observations, these speculations are based on small scale features perceived in the spacecraft images, such as "pyramids" and the "Face on Mars". In his book Cosmos, planetary astronomer Carl Sagan wrote: "Mars has become a kind of mythic arena onto which we have projected our Earthly hopes and fears." The depiction of Mars in fiction has been stimulated by its dramatic red color and by nineteenth-century scientific speculations that its surface conditions might support not just life but intelligent life. This gave way to many science fiction stories involving these concepts, such as H. G. Wells's The War of the Worlds, in which Martians seek to escape their dying planet by invading Earth; Ray Bradbury's The Martian Chronicles, in which human explorers accidentally destroy a Martian civilization; as well as Edgar Rice Burroughs's series Barsoom, C. S. Lewis's novel Out of the Silent Planet (1938), and a number of Robert A. Heinlein stories before the mid-sixties. Since then, depictions of Martians have also extended to animation. A comic figure of an intelligent Martian, Marvin the Martian, appeared in Haredevil Hare (1948) as a character in the Looney Tunes animated cartoons of Warner Brothers, and has continued as part of popular culture to the present. After the Mariner and Viking spacecraft had returned pictures of Mars as a lifeless and canal-less world, these ideas about Mars were abandoned; for many science-fiction authors, the new discoveries initially seemed like a constraint, but eventually the post-Viking knowledge of Mars became itself a source of inspiration for works like Kim Stanley Robinson's Mars trilogy. See also Notes References Further reading External links Solar System → Local Interstellar Cloud → Local Bubble → Gould Belt → Orion Arm → Milky Way → Milky Way subgroup → Local Group → Local Sheet → Local Volume → Virgo Supercluster → Laniakea Supercluster → Pisces–Cetus Supercluster Complex → Local Hole → Observable universe → UniverseEach arrow (→) may be read as "within" or "part of". |
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Contents History of Israel The history of Israel covers the Southern Levant region also known as Canaan, Palestine, or the Holy Land, which is the location of Israel and Palestine. From prehistory, as part of the Levantine corridor, the area witnessed waves of early humans from Africa, then the emergence of Natufian culture c. 10,000 BCE. The region entered the Bronze Age c. 2,000 BCE with the development of Canaanite civilization. In the Iron Age, the kingdoms of Israel and Judah were established, entities central to the origins of the Abrahamic religions. This has given rise to Judaism, Samaritanism, Christianity, Islam, Druzism, Baha'ism. The Land of Israel has seen many conflicts, been controlled by various polities, and hosted various ethnic groups. In the following centuries, the Assyrian, Babylonian, Achaemenid, and Macedonian empires conquered the region. Ptolemies and Seleucids vied for control during the Hellenistic period. Through the Hasmonean dynasty, the Jews maintained independence for a century before incorporation into the Roman Republic. As a result of the Jewish–Roman wars in the 1st and 2nd centuries CE, many Jews were killed, or sold into slavery. Following the advent of Christianity, demographics shifted towards newfound Christians, who replaced Jews as the majority by the 4th century. In the 7th century, Byzantine Christian rule over Israel was superseded in the Muslim conquest of the Levant by the Rashidun Caliphate, to later be ruled by the Umayyad, Abbasid, and Fatimid caliphates, before being conquered by the Seljuks in the 1070s. Throughout the 12th and 13th centuries, the Land of Israel saw wars between Christians and Muslims as part of the Crusades, with the Kingdom of Jerusalem overrun by Saladin's Ayyubids in the 12th century. The Crusaders hung on to decreasing territories for another century. In the 13th century, the Land of Israel became subject to Mongol conquest, though this was stopped by the Mamluk Sultanate, under whose rule it remained until the 16th century. The Mamluks were defeated by the Ottoman Empire, and the region became an Ottoman province until the early 20th century. The 19th century saw the rise of a Jewish nationalist movement in Europe known as Zionism; aliyah, Jewish immigration to Israel from the diaspora, increased. During World War I, the Sinai and Palestine campaign of the Allies led to the partition of the Ottoman Empire. Britain was granted control of the region by a League of Nations mandate, known as Mandatory Palestine. The British committed to the creation of a Jewish homeland in the 1917 Balfour Declaration. Palestinian Arabs sought to prevent Jewish immigration, and tensions grew during British administration. In 1947, the UN voted for the partition of Mandate Palestine and creation of a Jewish and Arab state. The Jews accepted the plan, while the Arabs rejected it. A civil war ensued, won by the Jews. In May 1948, the Israeli Declaration of Independence sparked the 1948 War in which Israel repelled the armies of the neighbouring states. It resulted in the 1948 Palestinian expulsion and flight and led to Jewish emigration from other parts of the Middle East. About 40% of the global Jewish population resides in Israel. In 1979, the Egypt–Israel peace treaty was signed. In 1993, Israel signed the Oslo I Accord with the Palestine Liberation Organization, which was followed by the establishment of the Palestinian Authority. In 1994, the Israel–Jordan peace treaty was signed. Despite a long-running Israeli–Palestinian peace process, the conflict continues. Prehistory The oldest evidence of early humans in the territory of modern Israel, dating to 1.5 million years ago, was found in Ubeidiya near the Sea of Galilee. Flint tool artefacts have been discovered at Yiron, the oldest stone tools found anywhere outside Africa.[dubious – discuss] The Daughters of Jacob Bridge over the Jordan River provides evidence of the control of fire by early humans around 780,000 years ago, one of the oldest known examples. In the Mount Carmel area at el-Tabun, and Es Skhul, Neanderthal and early modern human remains were found, showing the longest stratigraphic record in the region, spanning 600,000 years of human activity, from the Lower Paleolithic to the present day, representing roughly a million years of human evolution. Other significant Paleolithic sites include Qesem cave. A 200,000-year-old fossil from Misliya Cave is the second-oldest evidence of anatomically modern humans found outside Africa. Other notable finds include the Skhul and Qafzeh hominins, as well as Manot 1. Around 10th millennium BCE, the Natufian culture existed in the area. The beginning of agriculture in the region during the Neolithic Revolution is evidenced by sites such as Nahal Oren and Gesher. Here is one of the more common periodisations. Bronze Age Canaan The Canaanites are archaeologically attested in the Middle Bronze Age (2100–1550 BCE). There were probably independent or semi-independent city-states. Cities were often surrounded by massive earthworks, resulting in the archaeological mounds, or 'tells' common in the region today. In the late Middle Bronze Age, the Nile Delta in Egypt was settled by Canaanites who maintained close connections with Canaan. During that period, the Hyksos, dynasties of Canaanite/Asiatic origin, ruled much of Lower Egypt before being overthrown in the 16th century BCE. During the Late Bronze Age (1550–1200 BCE), there were Canaanite vassal states paying tribute to the New Kingdom of Egypt, which governed from Gaza. In 1457 BCE, Egyptian forces under the command of Pharaoh Thutmose III defeated a rebellious coalition of Canaanite vassal states led by Kadesh's king at the Battle of Megiddo. In the Late Bronze Age there was a period of civilizational collapse in the Middle East, Canaan fell into chaos, and Egyptian control ended. There is evidence that urban centers such as Hazor, Beit She'an, Megiddo, Ekron, Isdud and Ascalon were damaged or destroyed. Two groups appear at this time, and are associated with the transition to the Iron Age (they used iron weapons/tools which were better than earlier bronze): the Sea Peoples, particularly the Philistines, who migrated from the Aegean world and settled on the southern coast, and the Israelites, whose settlements dotted the highlands. Some 2nd millennium inscriptions about the semi-nomadic Habiru people are believed to be connected to the Hebrews, who were generally synonymous with the Biblical Israelites. Many scholars regard this connection to be plausible since the two ethnonyms have similar etymologies, although others argue that Habiru refers to a social class found in every Near Eastern society, including Hebrew societies. Ancient Israel and Judah: Iron Age to Babylonian period The earliest recorded evidence of a people by the name of Israel (as ysrỉꜣr) occurs in the Egyptian Merneptah Stele, erected for Pharaoh Merneptah c. 1209 BCE. Archeological evidence indicates that during the early Iron Age I, hundreds of small villages were established on the highlands of Canaan on both sides of the Jordan River, primarily in Samaria, north of Jerusalem. These villages had populations of up to 400, were largely self-sufficient and lived from herding, grain cultivation, and growing vines and olives with some economic interchange. The pottery was plain and undecorated. Writing was known and available for recording, even in small sites. William G. Dever sees this "Israel" in the central highlands as a cultural and probably political entity, more an ethnic group rather than an organized state. Modern scholars believe that the Israelites and their culture branched out of the Canaanite peoples and their cultures through the development of a distinct monolatristic—and later monotheistic—religion centred on a national god Yahweh. According to McNutt, "It is probably safe to assume that sometime during Iron Age I a population began to identify itself as 'Israelite'", differentiating itself from the Canaanites through such markers as the prohibition of intermarriage, an emphasis on family history and genealogy, and religion. Philistine cooking tools and the prevalence of pork in their diets, and locally made Mycenaean pottery—which later evolved into bichrome Philistine pottery—all support their foreign origin. Their cities were large and elaborate, which—together with the findings—point to a complex, hierarchical society. Israel Finkelstein believes that the oldest Abraham traditions originated in the Iron Age, which focus on the themes of land and offspring and possibly, his altars in Hebron. Abraham's Mesopotamian heritage is not discussed. In the 10th century BCE, the Israelite kingdoms of Judah and Israel emerged. The Hebrew Bible states that these were preceded by a single kingdom ruled by Saul, David and Solomon, who is said to have built the First Temple. Archaeologists have debated whether the united monarchy ever existed,[Notes 1] with those in favor of such a polity existing further divided between maximalists who support the Biblical accounts, and minimalists who argue that any such polity was likely smaller than suggested. Historians and archaeologists agree that the northern Kingdom of Israel existed by ca. 900 BCE and the Kingdom of Judah existed by ca. 850 BCE. The Kingdom of Israel was the more prosperous of the two kingdoms and soon developed into a regional power; during the days of the Omride dynasty, it controlled Samaria, Galilee, the upper Jordan Valley, the Sharon and large parts of the Transjordan. Samaria, the capital, was home to one of the largest Iron Age structures in the Levant. The Kingdom of Israel's capital moved between Shechem, Penuel and Tirzah before Omri settled it in Samaria, and the royal succession was often settled by a military coup d'état. The Kingdom of Judah was smaller but more stable; the Davidic dynasty ruled the kingdom for the four centuries of its existence, with the capital always in Jerusalem, controlling the Judaean Mountains, most of the Shephelah and the Beersheba valley in the northern Negev. In 854 BCE, according to the Kurkh Monoliths, an alliance between Ahab of Israel and Ben Hadad II of Aram-Damascus managed to repulse the incursions of the Assyrians, with a victory at the Battle of Qarqar. Another important discovery of the period is the Mesha Stele, a Moabite stele found in Dhiban when Emir Sattam Al-Fayez led Henry Tristram to it as they toured the lands of the vassals of the Bani Sakher. The stele is now in the Louvre. In the stele, Mesha, king of Moab, tells how Chemosh, the god of Moab, had been angry with his people and had allowed them to be subjugated to the Kingdom of Israel, but at length, Chemosh returned and assisted Mesha to throw off the yoke of Israel and restore the lands of Moab. It refers to Omri, king of Israel, to the god Yahweh, and may contain another early reference to the House of David. The Kingdom of Israel fell to the Assyrians following a long siege of the capital Samaria around 720 BCE. The records of Sargon II indicate that he captured Samaria and deported 27,290 inhabitants to Mesopotamia. It is likely that Shalmaneser captured the city since both the Babylonian Chronicles and the Hebrew Bible viewed the fall of Israel as the signature event of his reign. The Assyrian deportations became the basis for the Jewish idea of the Ten Lost Tribes. Foreign groups were settled by the Assyrians in the territories of the fallen kingdom. The Samaritans claim to be descended from Israelites of ancient Samaria who were not expelled by the Assyrians. It is believed that refugees from the destruction of Israel moved to Judah, massively expanding Jerusalem and leading to construction of the Siloam Tunnel during the rule of King Hezekiah (ruled 715–686 BCE). The Siloam inscription, a plaque written in Hebrew left by the construction team, was discovered in the tunnel in 1880s, and is today held by the Istanbul Archaeology Museum. During Hezekiah's rule, Sennacherib, the son of Sargon, attempted but failed to capture Judah. Assyrian records say that Sennacherib levelled 46 walled cities and besieged Jerusalem, leaving after receiving extensive tribute. Sennacherib erected the Lachish reliefs in Nineveh to commemorate a second victory at Lachish. The writings of four different "prophets" are believed to date from this period: Hosea and Amos in Israel and Micah and Isaiah of Judah. These men were mostly social critics who warned of the Assyrian threat and acted as religious spokesmen. They exercised some form of free speech and may have played a significant social and political role in Israel and Judah. They urged rulers and the general populace to adhere to god-conscious ethical ideals, seeing the Assyrian invasions as a divine punishment of the collective resulting from ethical failures. Under King Josiah (ruler from 641 to 619 BCE), the Book of Deuteronomy was either rediscovered or written. The Book of Joshua and the accounts of the kingship of David and Solomon in the Book of Kings are believed to have the same author. The books are known as Deuteronomist and considered to be a key step in the emergence of monotheism in Judah. They emerged at a time that Assyria was weakened by the emergence of Babylon and may be a committing to text of pre-writing verbal traditions. During the late 7th century BCE, Judah became a vassal state of the Neo-Babylonian Empire. In 601 BCE, Jehoiakim of Judah allied with Babylon's principal rival, Egypt, despite the strong remonstrances of the prophet Jeremiah. As a punishment, the Babylonians besieged Jerusalem in 597 BCE, and the city surrendered. The defeat was recorded by the Babylonians. Nebuchadnezzar pillaged Jerusalem and deported king Jechoiachin (Jeconiah), along with other prominent citizens, to Babylon; Zedekiah, his uncle, was installed as king. A few years later, Zedekiah launched another revolt against Babylon, and an army was sent to conquer Jerusalem. In 587 or 586 BCE, King Nebuchadnezzar II of Babylon conquered Jerusalem, destroyed the First Temple and razed the city. The Kingdom of Judah was abolished, and many of its citizens were exiled to Babylon. The former territory of Judah became a Babylonian province called Yehud with its center in Mizpah, north of the destroyed Jerusalem. Tablets that describe King Jehoiachin's rations were found in the ruins of Babylon. He was eventually released by the Babylonians. According to both the Bible and the Talmud, the Davidic dynasty continued as head of Babylonian Jewry, called the "Rosh Galut" (exilarch or head of exile). Arab and Jewish sources show that the Rosh Galut continued to exist for another 1,500 years in what is now Iraq, ending in the eleventh century. Second Temple period In 538 BCE, Cyrus the Great of the Achaemenid Empire conquered Babylon and took over its empire. Cyrus issued a proclamation granting religious freedom to all peoples subjugated by the Babylonians (see the Cyrus Cylinder). According to the Bible, Jewish exiles in Babylon, including 50,000 Judeans led by Zerubabel, returned to Judah to rebuild the Temple in Jerusalem. The Second Temple was subsequently completed c. 515 BCE. A second group of 5,000, led by Ezra and Nehemiah, returned to Judah in 456 BCE. The first was empowered by the Persian king to enforce religious rules, the second had the status of governor and a royal mission to restore the walls of the city. The country remained a province of the Achaemenid empire called Yehud until 332 BCE. The final text of the Torah is thought to have been written during the Persian period (probably 450–350 BCE). The text was formed by editing and unifying earlier texts. The returning Israelites adopted an Aramaic script (also known as the Ashuri alphabet), which they brought back from Babylon; this is the current Hebrew script. The Hebrew calendar closely resembles the Babylonian calendar and probably dates from this period. The Bible describes tension between the returnees, the elite of the First Temple period, and those who had remained in Judah. It is possible that the returnees, supported by the Persian monarchy, became large landholders at the expense of the people who had remained to work the land in Judah, whose opposition to the Second Temple would have reflected a fear that exclusion from the cult would deprive them of land rights. Judah had become in practice a theocracy, ruled by hereditary High Priests and a Persian-appointed governor, frequently Jewish, charged with keeping order and seeing that tribute was paid. A Judean military garrison was placed by the Persians on Elephantine Island near Aswan in Egypt. In the early 20th century, 175 papyrus documents recording activity in this community were discovered, including the "Passover Papyrus", a letter instructing the garrison on how to correctly conduct the Passover feast. In 332 BCE, Alexander the Great of Macedon conquered the region as part of his campaign against the Achaemenid Empire. After his death in 322 BCE, his generals divided the empire and Judea became a frontier region between the Seleucid Empire and Ptolemaic Kingdom in Egypt. Following a century of Ptolemaic rule, Judea was conquered by the Seleucid Empire in 200 BCE at the battle of Panium. Hellenistic rulers generally respected Jewish culture and protected Jewish institutions. Judea was ruled by the hereditary office of the High Priest of Israel as a Hellenistic vassal. Nevertheless, the region underwent a process of Hellenization, which heightened tensions between Greeks, Hellenized Jews, and observant Jews. These tensions escalated into clashes involving a power struggle for the position of high priest and the character of the holy city of Jerusalem. When Antiochus IV Epiphanes consecrated the temple, forbade Jewish practices, and forcibly imposed Hellenistic norms on the Jews, several centuries of religious tolerance under Hellenistic control came to an end. In 167 BCE, the Maccabean revolt erupted after Mattathias, a Jewish priest of the Hasmonean lineage, killed a Hellenized Jew and a Seleucid official who participated in sacrifice to the Greek gods in Modi'in. His son Judas Maccabeus defeated the Seleucids in several battles, and in 164 BCE, he captured Jerusalem and restored temple worship, an event commemorated by the Jewish festival of Hannukah. After Judas' death, his brothers Jonathan Apphus and Simon Thassi were able to establish and consolidate a vassal Hasmonean state in Judea, capitalizing on the Seleucid Empire's decline as a result of internal instability and wars with the Parthians, and by forging ties with the rising Roman Republic. Hasmonean leader John Hyrcanus was able to gain independence, doubling Judea's territories. He took control of Idumaea, where he converted the Edomites to Judaism, and invaded Scythopolis and Samaria, where he demolished the Samaritan Temple. Hyrcanus was also the first Hasmonean leader to mint coins. Under his sons, kings Aristobulus I and Alexander Jannaeus, Hasmonean Judea became a kingdom, and its territories continued to expand, now also covering the coastal plain, Galilee and parts of the Transjordan. Some scholars argue that the Hasmonean dynasty also institutionalized the final Jewish biblical canon. Under Hasmonean rule, the Pharisees, Sadducees and the mystic Essenes emerged as the principal Jewish social movements. The Pharisee sage Simeon ben Shetach is credited with establishing the first schools based around meeting houses. This was a key step in the emergence of Rabbinical Judaism. After Jannaeus' widow, queen Salome Alexandra, died in 67 BCE, her sons Hyrcanus II and Aristobulus II engaged in a civil war over succession. The conflicting parties requested Pompey's assistance on their behalf, which paved the way for a Roman takeover of the kingdom. In 63 BCE, the Roman Republic conquered Judaea, ending Jewish independence under the Hasmoneans. Roman general Pompey intervened in a dynastic civil war and, after capturing Jerusalem, reinstated Hyrcanus II as high priest but denied him the title of king. Rome soon installed the Herodian dynasty—of Idumean descent but Jewish by conversion—as a loyal replacement for the nationalist Hasmoneans. In 37 BCE, Herod the Great, the first client king of this line, took power after defeating the restored Hasmonean king Antigonus II Mattathias. Herod imposed heavy taxes, suppressed opposition, and centralized authority, which fostered widespread resentment. Herod also carried out major monumental construction projects throughout his kingdom, and significantly expanded the Second Temple, which he transformed into one of the largest religious structures in the ancient world. After his death in 4 BCE, his kingdom was divided among his sons into a tetrarchy under continued Roman oversight. In 6 CE, Roman emperor Augustus transformed Judaea into a Roman province, deposing its last Jewish ruler, Herod Archelaus, and appointing a Roman governor in his place. That same year, a census triggered a small uprising by Judas of Galilee, the founder of a movement that rejected foreign authority and recognized only God as king. Over the next six decades, with the brief exception of a short period of Jewish autonomy under the client king Herod Agrippa I, the province remained under direct Roman administration. Some governors ruled with brutality and showed little regard for Jewish religious sensitivities, deepening resentment among the local population. This discontent was also fueled by poor governance, corruption, and growing economic inequality, along with rising tensions between Jews and neighboring populations over ethnic, religious, and territorial disputes. At the same time, collective memory of the Maccabean revolt and the period of Hasmonean independence continued to inspire hopes for national liberation from Roman control. In 64 CE, the Temple High Priest Joshua ben Gamla introduced a religious requirement for Jewish boys to learn to read from the age of six. Over the next few hundred years this requirement became steadily more ingrained in Jewish tradition. The Jewish–Roman wars were a series of large-scale revolts by Jewish subjects against the Roman Empire between 66 and 135 CE. The term primarily applies to the First Jewish–Roman War (66–73 CE) and the Bar Kokhba revolt (132–136 CE), both nationalist rebellions aimed at restoring Jewish independence in Judea. Some sources also include the Diaspora Revolt (115–117 CE), an ethno-religious conflict fought across the Eastern Mediterranean and including the Kitos War in Judaea. The Jewish–Roman wars had a devastating impact on the Jewish people, transforming them from a major population in the Eastern Mediterranean into a dispersed and persecuted minority. The First Jewish-Roman War culminated in the destruction of Jerusalem and other towns and villages in Judaea, resulting in significant loss of life and a considerable segment of the population being uprooted or displaced. Those who remained were stripped of any form of political autonomy. Subsequently, the brutal suppression of the Bar Kokhba revolt resulted in even more severe consequences. Judea witnessed a significant depopulation, as many Jews were killed, expelled, or sold into slavery. The outcome of the conflict marked the termination of efforts to reestablish a Jewish state until the modern era. Jews were banned from residing in the vicinity of Jerusalem, which the Romans rebuilt into the pagan colony of Aelia Capitolina, and the province of Judaea was renamed Syria Palaestina. Collectively, these events enhanced the role of Jewish diaspora, relocating the Jewish demographic and cultural center to Galilee and eventually to Babylonia, with smaller communities across the Mediterranean, the Middle East, and beyond. The Jewish–Roman wars also had a major impact on Judaism, after the central worship site of Second Temple Judaism, the Second Temple in Jerusalem, was destroyed by Titus's troops in 70 CE. The destruction of the Temple led to a transformation in Jewish religious practices, emphasizing prayer, Torah study, and communal gatherings in synagogues. This pivotal shift laid the foundation for the emergence of Rabbinic Judaism, which has been the dominant form of Judaism since late antiquity, after the codification of the Babylonian Talmud. Late Roman and Byzantine periods As a result of the disastrous effects of the Bar Kokhba revolt, Jewish presence in the region significantly dwindled. Over the next centuries, more Jews left to communities in the Diaspora, especially the large, speedily growing Jewish communities in Babylonia and Arabia. Others remained in the Land of Israel, where the spiritual and demographic center shifted from the depopulated Judea to Galilee. Jewish presence also continued in the southern Hebron Hills, in Ein Gedi, and on the coastal plain. The Mishnah and the Jerusalem Talmud, huge compendiums of Rabbinical discussions, were compiled during the 2nd to 4th centuries CE in Tiberias and Jerusalem. Following the revolt, Judea's countryside was penetrated by pagan populations, including migrants from the nearby provinces of Syria, Phoenicia, and Arabia, whereas Aelia Capitolina, its immediate vicinity, and administrative centers were now inhabited by Roman veterans and settlers from the western parts of the empire. The Romans permitted a hereditary Rabbinical Patriarch from the House of Hillel, called the "Nasi", to represent the Jews in dealings with the Romans. One prominent figure was Judah ha-Nasi, credited with compiling the final version of the Mishnah, a vast collection of Jewish oral traditions. He also emphasized the importance of education in Judaism, leading to requirements that illiterate Jews be treated as outcasts. This might have contributed to some illiterate Jews converting to Christianity. Jewish seminaries, such as those at Shefaram and Bet Shearim, continued to produce scholars. The best of these became members of the Sanhedrin, which was located first at Sepphoris and later at Tiberias. In the Galillee, many synagogues have been found dating from this period, and the burial site of the Sanhedrin leaders was discovered in Beit She'arim. In the 3rd century, the Roman Empire faced an economic crisis and imposed heavy taxation to fund wars of imperial succession. This situation prompted additional Jewish migration from Syria Palaestina to the Sasanian Empire, known for its more tolerant environment; there, a flourishing Jewish community with important Talmudic academies thrived in Babylonia, engaging in a notable rivalry with the Talmudic academies of Palaestina. Early in the 4th century, the Emperor Constantine made Constantinople the capital of the East Roman Empire and made Christianity an accepted religion. His mother Helena made a pilgrimage to Jerusalem (326–328) and led the construction of the Church of the Nativity (birthplace of Jesus in Bethlehem), the Church of the Holy Sepulchre (burial site of Jesus in Jerusalem) and other key churches that still exist. The name Jerusalem was restored to Aelia Capitolina and became a Christian city. Jews were still banned from living in Jerusalem, but were allowed to visit and worship at the site of the ruined temple. Over the course of the next century Christians worked to eradicate "paganism", leading to the destruction of classical Roman traditions and eradication of their temples. In 351–2, another Jewish revolt in the Galilee erupted against a corrupt Roman governor. The Roman Empire split in 390 CE and the region became part of the Eastern Roman Empire, known as the Byzantine Empire. Under Byzantine rule, much of the region and its non-Jewish population were won over by Christianity, which eventually became the dominant religion in the region. The presence of holy sites drew Christian pilgrims, some of whom chose to settle, contributing to the rise of a Christian majority. Christian authorities encouraged this pilgrimage movement and appropriated lands, constructing magnificent churches at locations linked to biblical narratives. Additionally, monks established monasteries near pagan settlements, encouraging the conversion of local pagans. During the Byzantine period, the Jewish presence in the region declined, and it is believed that Jews lost their majority status in Palestine in the fourth century. While Judaism remained the sole non-Christian religion tolerated, restrictions on Jews gradually increased, prohibiting the construction of new places of worship, holding public office, or owning Christian slaves. In 425, after the death of the last Nasi, Gamliel VI, the Nasi office and the Sanhedrin were officially abolished, and the standing of yeshivot weakened. The leadership void was gradually filled by the Jewish center in Babylonia, which would assume a leading role in the Jewish world for generations after the Byzantine period. During the 5th and 6th centuries CE, the region witnessed a series of Samaritan revolts against Byzantine rule. Their suppression resulted in the decline of Samaritan presence and influence, and further consolidated Christian domination. Though it is acknowledged that some Jews and Samaritans converted to Christianity during the Byzantine period, the reliable historical records are limited, and they pertain to individual conversions rather than entire communities. In 611, Khosrow II, ruler of Sassanid Persia, invaded the Byzantine Empire. He was helped by Jewish fighters recruited by Benjamin of Tiberias and captured Jerusalem in 614. The "True Cross" was captured by the Persians. The Jewish Himyarite Kingdom in Yemen may also have provided support. Nehemiah ben Hushiel was made governor of Jerusalem. Christian historians of the period claimed the Jews massacred Christians in the city, but there is no archeological evidence of destruction, leading modern historians to question their accounts. In 628, Kavad II (son of Kosrow) returned Palestine and the True Cross to the Byzantines and signed a peace treaty with them. Following the Byzantine re-entry, Heraclius massacred the Jewish population of Galilee and Jerusalem, while renewing the ban on Jews entering the latter. Early Muslim period The Levant was conquered by an Arab army under the command of ʿUmar ibn al-Khaṭṭāb in 635, and became the province of Bilad al-Sham of the Rashidun Caliphate. Two military districts—Jund Filastin and Jund al-Urdunn—were established in Palestine. A new city called Ramlah was built as the Muslim capital of Jund Filastin, while Tiberias served as the capital of Jund al-Urdunn. The Byzantine ban on Jews living in Jerusalem came to an end. In 661, Mu'awiya I was crowned Caliph in Jerusalem, becoming the first of the (Damascus-based) Umayyad dynasty. In 691, Umayyad Caliph Abd al-Malik (685–705) constructed the Dome of the Rock shrine on the Temple Mount, where the two Jewish temples had been located. A second building, the Al-Aqsa Mosque, was also erected on the Temple Mount in 705. Both buildings were rebuilt in the 10th century following a series of earthquakes. In 750, Arab discrimination against non-Arab Muslims led to the Abbasid Revolution and the Umayyads were replaced by the Abbasid Caliphs who built a new city, Baghdad, to be their capital. This period is known as the Islamic Golden Age, the Arab Empire was the largest in the world and Baghdad the largest and richest city. Both Arabs and minorities prospered across the region and much scientific progress was made. There were however setbacks: During the 8th century, the Caliph Umar II introduced a law requiring Jews and Christians to wear identifying clothing. Jews were required to wear yellow stars round their neck and on their hats, Christians had to wear Blue. Clothing regulations arose during repressive periods of Arab rule and were more designed to humiliate then persecute non-Muslims. A poll tax was imposed on all non-Muslims by Islamic rulers and failure to pay could result in imprisonment or worse. In 982, Caliph Al-Aziz Billah of the Cairo-based Fatimid dynasty conquered the region. The Fatimids were followers of Isma'ilism, a branch of Shia Islam and claimed descent from Fatima, Mohammed's daughter. Around the year 1010, the Church of Holy Sepulchre (believed to be Jesus burial site), was destroyed by Fatimid Caliph al-Hakim, who relented ten years later and paid for it to be rebuilt. In 1020 al-Hakim claimed divine status and the newly formed Druze religion gave him the status of a messiah. Although the Arab conquest was relatively peaceful and did not cause widespread destruction, it did alter the country's demographics significantly. Over the ensuing several centuries, the region experienced a drastic decline in its population, from an estimated 1 million during Roman and Byzantine times to some 300,000 by the early Ottoman period. This demographic collapse was accompanied by a slow process of Islamization, that resulted from the flight of non-Muslim populations, immigration of Muslims, and local conversion. The majority of the remaining populace belonged to the lowest classes. While the Arab conquerors themselves left the area after the conquest and moved on to other places, the settlement of Arab tribes in the area both before and after the conquest also contributed to the Islamization. As a result, the Muslim population steadily grew and the area became gradually dominated by Muslims on a political and social level. During the early Islamic period, many Christians and Samaritans, belonging to the Byzantine upper class, migrated from the coastal cities to northern Syria and Cyprus, which were still under Byzantine control, while others fled to the central highlands and the Transjordan. As a result, the coastal towns, formerly important economic centers connected with the rest of the Byzantine world, were emptied of most of their residents. Some of these cities—namely Ashkelon, Acre, Arsuf, and Gaza—now fortified border towns, were resettled by Muslim populations, who developed them into significant Muslim centers. The region of Samaria also underwent a process of Islamization as a result of waves of conversion among the Samaritan population and the influx of Muslims into the area. The predominantly Jacobite Monophysitic Christian population had been hostile to Byzantium orthodoxy, and at times for that reason welcomed Muslim rule. There is no strong evidence for forced conversion, or that the jizya tax significantly affected such changes. The demographic situation in Palestine was further altered by urban decline under the Abbasids, and it is thought that the 749 earthquake hastened this process by causing an increase in the number of Jews, Christians, and Samaritans who emigrated to diaspora communities while also leaving behind others who remained in the devastated cities and poor villages until they converted to Islam. Historical records and archeological evidence suggest that many Samaritans converted under Abbasid and Tulunid rule, after suffering through severe difficulties such droughts, earthquakes, religious persecution, heavy taxes and anarchy. The same region also saw the settlement of Arabs. Over the period, the Samaritan population drastically decreased, with the rural Samaritan population converting to Islam, and small urban communities remaining in Nablus and Caesarea, as well as in Cairo, Damascus, Aleppo and Sarepta. Nevertheless, the Muslim population remained a minority in a predominantly Christian area, and it is likely that this status persisted until the Crusader period. Crusades and Mongols In 1095, Pope Urban II called upon Christians to wage a holy war and recapture Jerusalem from Muslim rule. Responding to this call, Christians launched the First Crusade in the same year, a military campaign aimed at retaking the Holy Land, ultimately resulting in the successful siege and conquest of Jerusalem in 1099. In the same year, the Crusaders conquered Beit She'an and Tiberias, and in the following decade, they captured coastal cities with the support of Italian city-state fleets, establishing these coastal ports as crucial strongholds for Crusader rule in the region. Following the First Crusade, several Crusader states were established in the Levant, with the Kingdom of Jerusalem (Regnum Hierosolymitanum) assuming a preeminent position and enjoying special status among them. The population consisted predominantly of Muslims, Christians, Jews, and Samaritans, while the Crusaders remained a minority and relied on the local population who worked the soil. The region saw the construction of numerous robust castles and fortresses, yet efforts to establish permanent European villages proved unsuccessful. Around 1180, Raynald of Châtillon, ruler of Transjordan, caused increasing conflict with the Ayyubid Sultan Saladin (Salah-al-Din), leading to the defeat of the Crusaders in the 1187 Battle of Hattin (above Tiberias). Saladin was able to peacefully take Jerusalem and conquered most of the former Kingdom of Jerusalem. Saladin's court physician was Maimonides, a refugee from Almohad (Muslim) persecution in Córdoba, Spain, where all non-Muslim religions had been banned. The Christian world's response to the loss of Jerusalem came in the Third Crusade of 1190. After lengthy battles and negotiations, Richard the Lionheart and Saladin concluded the Treaty of Jaffa in 1192 whereby Christians were granted free passage to make pilgrimages to the holy sites, while Jerusalem remained under Muslim rule. In 1229, Jerusalem peacefully reverted into Christian control as part of a treaty between Holy Roman Emperor Frederick II and Ayyubid sultan al-Kamil that ended the Sixth Crusade. In 1244, Jerusalem was sacked by the Khwarezmian Tatars who decimated the city's Christian population, drove out the Jews and razed the city. The Khwarezmians were driven out by the Ayyubids in 1247. Mamluk period Between 1258 and 1291, the area was the frontier between Mongol invaders (occasional Crusader allies) and the Mamluks of Egypt. The conflict impoverished the country and severely reduced the population. In Egypt a caste of warrior slaves, known as the Mamluks, gradually took control of the kingdom. The Mamluks were mostly of Turkish origin, and were bought as children and then trained in warfare. They were highly prized warriors, who gave rulers independence of the native aristocracy. In Egypt they took control of the kingdom following a failed invasion by the Crusaders (Seventh Crusade). The first Mamluk Sultan, Qutuz of Egypt, defeated the Mongols in the Battle of Ain Jalut ("Goliath's spring" near Ein Harod), ending the Mongol advances. He was assassinated by one of his Generals, Baibars, who went on to eliminate most of the Crusader outposts. The Mamluks ruled Palestine until 1516, regarding it as part of Syria. In Hebron, Jews were banned from worshipping at the Cave of the Patriarchs (the second-holiest site in Judaism); they were only allowed to enter 7 steps inside the site and the ban remained in place until Israel assumed control of the West Bank in the Six-Day War.[undue weight? – discuss] The Egyptian Mamluk sultan Al-Ashraf Khalil conquered the last outpost of Crusader rule in 1291. The Mamluks, continuing the policy of the Ayyubids, made the strategic decision to destroy the coastal area and to bring desolation to many of its cities, from Tyre in the north to Gaza in the south. Ports were destroyed and various materials were dumped to make them inoperable. The goal was to prevent attacks from the sea, given the fear of the return of the Crusaders. This had a long-term effect on those areas, which remained sparsely populated for centuries. The activity in that time concentrated more inland. With the 1492 expulsion of Jews from Spain and 1497 persecution of Jews and Muslims by Manuel I of Portugal, many Jews moved eastward, with some deciding to settle in the Mamluk Palestine. As a consequence, the local Jewish community underwent significant rejuvenation. The influx of Sephardic Jews began under Mamluk rule in the 15th century, and continued throughout the 16th century and especially after the Ottoman conquest. As city-dwellers, the majority of Sephardic Jews preferred to settle in urban areas, mainly in Safed but also in Jerusalem, while the Musta'arbi community comprised the majority of the villagers' Jews. Ottoman period Under the Mamluks, the area was a province of Bilad a-Sham (Syria). It was conquered by Turkish Sultan Selim I in 1516–17, becoming a part of the province of Ottoman Syria for the next four centuries, first as the Damascus Eyalet and later as the Syria Vilayet (following the Tanzimat reorganization of 1864). With the more favorable conditions that followed the Ottoman conquest, the immigration of Jews fleeing Catholic Europe, which had already begun under Mamluk rule, continued, and soon an influx of exiled Sephardic Jews came to dominate the Jewish community in the area. In 1558, Selim II (1566–1574), successor to Suleiman, whose wife Nurbanu Sultan was Jewish, gave control of Tiberias to Doña Gracia Mendes Nasi, one of the richest women in Europe and an escapee from the Inquisition. She encouraged Jewish refugees to settle in the area and established a Hebrew printing press. Safed became a centre for study of the Kabbalah and other Jewish religious studies, culminating with Joseph Karo's writing of the Shulchan Aruch – published in 1565 in Venice – which became the near-universal standard of Jewish religious law. Doña Nasi's nephew, Joseph Nasi, was made governor of Tiberias and he encouraged Jewish settlement from Italy. In 1660, a Druze power struggle led to the destruction of Safed and Tiberias. In the late 18th century a local Arab sheikh, Zahir al-Umar, created a de facto independent Emirate in the Galilee. Ottoman attempts to subdue the Sheikh failed, but after Zahir's death the Ottomans restored their rule in the area. In 1799, Napoleon briefly occupied the country and planned a proclamation inviting Jews to create a state. The proclamation was shelved following his defeat at Acre. In 1831, Muhammad Ali of Egypt, an Ottoman ruler who left the Empire and tried to modernize Egypt, conquered Ottoman Syria and imposed conscription, leading to the Arab revolt. In 1838, there was another Druze revolt. In 1839 Moses Montefiore met with Muhammed Pasha in Egypt and signed an agreement to establish 100–200 Jewish villages in the Damascus Eyalet of Ottoman Syria, but in 1840 the Egyptians withdrew before the deal was implemented, returning the area to Ottoman governorship. In 1844, Jews constituted the largest population group in Jerusalem. By 1896 Jews constituted an absolute majority in Jerusalem, but the overall population in Palestine was 88% Muslim and 9% Christian. Between 1882 and 1903, approximately 35,000 Jews moved to Palestine, known as the First Aliyah. In the Russian Empire, Jews faced growing persecution and legal restrictions. Half the world's Jews lived in the Russian Empire, where they were restricted to living in the Pale of Settlement. Severe pogroms in the early 1880s and legal repression led to 2 million Jews emigrating from the Russian Empire. 1.5 million went to the United States. Popular destinations were also Germany, France, the United Kingdom, the Netherlands, Argentina and Palestine. The Zionist movement began in earnest in 1882 with Leon Pinsker's pamphlet Auto-Emancipation, which argued for the creation of a Jewish national homeland as a means to avoid the violence plaguing Jewish communities in Eastern Europe. At the 1884 Katowice Conference, Russian Jews established the Bilu and Hovevei Zion ("Lovers of Zion") movements with the aim of settling in Palestine. In 1878, Russian Jewish emigrants established the village of Petah Tikva ("The Beginning of Hope"), followed by Rishon LeZion ("First to Zion") in 1882. The existing Ashkenazi communities were concentrated in the Four Holy Cities, extremely poor and relied on donations (halukka) from groups abroad, while the new settlements were small farming communities, but still relied on funding by the French Baron, Edmond James de Rothschild, who sought to establish profitable enterprises. Many early migrants could not find work and left, but despite the problems, more settlements arose and the community grew. After the Ottoman conquest of Yemen in 1881, a large number of Yemenite Jews also emigrated to Palestine, often driven by Messianism. In 1896 Theodor Herzl published Der Judenstaat (The Jewish State), in which he asserted that the solution to growing antisemitism in Europe (the so-called "Jewish Question") was to establish a Jewish state. In 1897, the World Zionist Organization was founded and the First Zionist Congress proclaimed its aim "to establish a home for the Jewish people in Palestine secured under public law." The Congress chose Hatikvah ("The Hope") as its anthem. Between 1904 and 1914, around 40,000 Jews settled in the area now known as Israel (the Second Aliyah). In 1908, the World Zionist Organization set up the Palestine Bureau (also known as the "Eretz Israel Office") in Jaffa and began to adopt a systematic Jewish settlement policy. In 1909, residents of Jaffa bought land outside the city walls and built the first entirely Hebrew-speaking town, Ahuzat Bayit (later renamed Tel Aviv). In 1915–1916, Talaat Pasha of the Young Turks forced around a million Armenian Christians from their homes in Eastern Turkey, marching them south through Syria, in what is now known as the Armenian genocide. The number of dead is thought to be around 700,000. Hundreds of thousands were forcibly converted to Islam. A community of survivors settled in Jerusalem, one of whom developed the now iconic Armenian pottery. During World War I, most Jews supported the Germans because they were fighting the Russians who were regarded as the Jews' main enemy. In Britain, the government sought Jewish support for the war effort for a variety of reasons including an antisemitic perception of "Jewish power" in the Ottoman Empire's Young Turks movement which was based in Thessaloniki, the most Jewish city in Europe (40% of the 160,000 population were Jewish). The British also hoped to secure American Jewish support for US intervention on Britain's behalf. There was already sympathy for the aims of Zionism in the British government, including the Prime Minister Lloyd George. Over 14,000 Jews were expelled by the Ottoman military commander from the Jaffa area in 1914–1915, due to suspicions they were subjects of Russia, an enemy, or Zionists wishing to detach Palestine from the Ottoman Empire, and when the entire population, including Muslims, of both Jaffa and Tel Aviv was subject to an expulsion order in April 1917, the affected Jews could not return until the British conquest ended in 1918, which drove the Turks out of Southern Syria. A year prior, in 1917, the British foreign minister, Arthur Balfour, sent a public letter to the British Lord Rothschild, a leading member of his party and leader of the Jewish community. The letter subsequently became known as the Balfour Declaration. It stated that the British Government "view[ed] with favour the establishment in Palestine of a national home for the Jewish people". The declaration provided the British government with a pretext for claiming and governing the country. New Middle Eastern boundaries were decided by an agreement between British and French bureaucrats. A Jewish Legion composed largely of Zionist volunteers organized by Ze'ev Jabotinsky and Joseph Trumpeldor participated in the British invasion. It also participated in the failed Gallipoli Campaign. The Nili Zionist spy network provided the British with details of Ottoman plans and troop concentrations. The Ottoman Empire chose to ally itself with Germany when the first war began. Arab leaders dreamed of freeing themselves from Ottoman rule and establishing self-government or forming an independent Arab state. Therefore, Britain contacted Hussein bin Ali of the Kingdom of Hejaz and proposed cooperation. Together they organized the Arab revolt that Britain supplied with very large quantities of rifles and ammunition. In cooperation between British artillery and Arab infantry, the city of Aqaba on the Red Sea was conquered. The Arab army then continued north while Britain attacked the ottomans from the sea. In 1917–1918, Jerusalem and Damascus were conquered from the ottomans. Britain then broke off cooperation with the Arab army. It turned out that Britain had already entered into the secret Sykes–Picot Agreement that meant that only Britain and France would be allowed to administer the land conquered from the Ottoman Empire. After pushing out the Ottomans, Palestine came under martial law. The British, French and Arab Occupied Enemy Territory Administration governed the area shortly before the armistice with the Ottomans until the promulgation of the mandate in 1920. Mandatory Palestine The British Mandate (in effect, British rule) of Palestine, including the Balfour Declaration, was confirmed by the League of Nations in 1922 and came into effect in 1923. The territory of Transjordan was also covered by the Mandate but under separate rules that excluded it from the Balfour Declaration. Britain signed a treaty with the United States (which did not join the League of Nations) in which the United States endorsed the terms of the Mandate, which was approved unanimously by both the U.S. Senate and House of Representatives. The Balfour declaration was published on the 2nd of November 1917 and the Bolsheviks seized control of Russia a week later. This led to civil war in the Russian Empire. Between 1918 and 1921, a series of pogroms led to the death of at least 100,000 Jews (mainly in what is now Ukraine), and the displacement as refugees of a further 600,000. This led to further migration to Palestine. Between 1919 and 1923, some 40,000 Jews arrived in Palestine in what is known as the Third Aliyah. Many of the Jewish immigrants of this period were Socialist Zionists and supported the Bolsheviks. The migrants became known as pioneers (halutzim), experienced or trained in agriculture who established self-sustaining communes called kibbutzim. Malarial marshes in the Jezreel Valley and Hefer Plain were drained and converted to agricultural use. Land was bought by the Jewish National Fund, a Zionist charity that collected money abroad for that purpose. After the French victory over the Arab Kingdom of Syria ended hopes of Arab independence, there were clashes between Arabs and Jews in Jerusalem during the 1920 Nebi Musa riots and in Jaffa the following year, leading to the establishment of the Haganah underground Jewish militia. A Jewish Agency was created which issued the entry permits granted by the British and distributed funds donated by Jews abroad. Between 1924 and 1929, over 80,000 Jews arrived in the Fourth Aliyah, fleeing antisemitism and heavy tax burdens imposed on trade in Poland and Hungary, inspired by Zionism and motivated by the closure of United States borders by the Immigration Act of 1924 which severely limited immigration from Eastern and Southern Europe. Pinhas Rutenberg, a former Commissar of St Petersburg in Russia's pre-Bolshevik Kerensky Government, built the first electricity generators in Palestine. In 1925, the Jewish Agency established the Hebrew University in Jerusalem and the Technion (technological university) in Haifa. British authorities introduced the Palestine pound (worth 1000 "mils") in 1927, replacing the Egyptian pound as the unit of currency in the Mandate. From 1928, the democratically elected Va'ad Leumi (Jewish National Council or JNC) became the main administrative institution of the Palestine Jewish community (Yishuv) and included non-Zionist Jews. As the Yishuv grew, the JNC adopted more government-type functions, such as education, health care, and security. With British permission, the Va'ad Leumi raised its own taxes and ran independent services for the Jewish population. In 1929, tensions grew over the Kotel (Wailing Wall), the holiest spot in the world for modern Judaism,[citation needed] which was then a narrow alleyway where the British banned Jews from using chairs or curtains: Many of the worshippers were elderly and needed seats; they also wanted to separate women from men. The Mufti of Jerusalem said it was Muslim property and deliberately had cattle driven through the alley.[citation needed] He alleged that the Jews were seeking control of the Temple Mount. This provided the spark for the August 1929 Palestine riots. The main victims were the (non-Zionist) ancient Jewish community at Hebron, who were massacred. The riots led to right-wing Zionists establishing their own militia in 1931, the Irgun Tzvai Leumi (National Military Organization, known in Hebrew by its acronym "Etzel"), which was committed to a more aggressive policy towards the Arab population. During the interwar period, the perception grew that there was an irreconciliable tension between the two Mandatory functions, of providing for a Jewish homeland in Palestine, and the goal of preparing the country for self-determination. The British rejected the principle of majority rule or any other measure that would give the Arab population, who formed the majority of the population, control over Palestinian territory. Between 1929 and 1938, 250,000 Jews arrived in Palestine (Fifth Aliyah). In 1933, the Jewish Agency and the Nazis negotiated the Ha'avara Agreement (transfer agreement), under which 50,000 German Jews would be transferred to Palestine. The Jews' possessions were confiscated and in return the Nazis allowed the Ha'avara organization to purchase 14 million pounds worth of German goods for export to Palestine and use it to compensate the immigrants. Although many Jews wanted to leave Nazi Germany, the Nazis prevented Jews from taking any money and restricted them to two suitcases so few could pay the British entry tax.[citation needed] The agreement was controversial and the Labour Zionist leader who negotiated the agreement, Haim Arlosoroff, was assassinated in Tel Aviv in 1933. The assassination was used by the British to create tension between the Zionist left and the Zionist right.[citation needed] Arlosoroff had been the boyfriend of Magda Ritschel some years before she married Joseph Goebbels. There has been speculation that he was assassinated by the Nazis to hide the connection but there is no evidence for it. Between 1933 and 1936, 174,000 arrived despite the large sums the British demanded for immigration permits: Jews had to prove they had 1,000 pounds for families with capital (equivalent to £85,824 in 2023), 500 pounds if they had a profession and 250 pounds if they were skilled labourers.[better source needed] Jewish immigration and Nazi propaganda contributed to the large-scale 1936–1939 Arab revolt in Palestine, a largely nationalist uprising directed at ending British rule. The head of the Jewish Agency, Ben-Gurion, responded to the Arab Revolt with a policy of "Havlagah"—self-restraint and a refusal to be provoked by Arab attacks in order to prevent polarization. The Etzel group broke off from the Haganah in opposition to this policy. The British responded to the revolt with the Peel Commission (1936–37), a public inquiry that recommended that an exclusively Jewish territory be created in the Galilee and western coast (including the population transfer of 225,000 Arabs); the rest becoming an exclusively Arab area. The two main Jewish leaders, Chaim Weizmann and David Ben-Gurion, had convinced the Zionist Congress to approve equivocally the Peel recommendations as a basis for more negotiation. The plan was rejected outright by the Palestinian Arab leadership and they renewed the revolt, which caused the British to abandon the plan as unworkable. Testifying before the Peel Commission, Weizmann said "There are in Europe 6,000,000 people ... for whom the world is divided into places where they cannot live and places where they cannot enter." In 1938, the US called an international conference to address the question of the vast numbers of Jews trying to escape Europe. Britain made its attendance contingent on Palestine being kept out of the discussion. No Jewish representatives were invited. The Nazis proposed their own solution: that the Jews of Europe be shipped to Madagascar (the Madagascar Plan). The agreement proved fruitless, and the Jews were stuck in Europe. With millions of Jews trying to leave Europe and every country closed to Jewish migration, the British decided to close Palestine. The White Paper of 1939, recommended that an independent Palestine, governed jointly by Arabs and Jews, be established within 10 years. The White Paper agreed to allow 75,000 Jewish immigrants into Palestine over the period 1940–44, after which migration would require Arab approval. Both the Arab and Jewish leadership rejected the White Paper. In March 1940 the British High Commissioner for Palestine issued an edict banning Jews from purchasing land in 95% of Palestine. Jews now resorted to illegal immigration: (Aliyah Bet or "Ha'apalah"), often organized by the Mossad Le'aliyah Bet and the Irgun. With no outside help and no countries ready to admit them, very few Jews managed to escape Europe between 1939 and 1945. Those caught by the British were mostly imprisoned in Mauritius. During the Second World War, the Jewish Agency worked to establish a Jewish army that would fight alongside the British forces. Churchill supported the plan but British military and government opposition led to its rejection. The British demanded that the number of Jewish recruits match the number of Arab recruits. In June 1940, Italy declared war on the British Commonwealth and sided with Germany. Within a month, Italian planes bombed Tel Aviv and Haifa, inflicting multiple casualties. In May 1941, the Palmach was established to defend the Yishuv against the planned Axis invasion through North Africa. The British refusal to provide arms to the Jews, even when Rommel's forces were advancing through Egypt in June 1942 (intent on occupying Palestine), and the 1939 White Paper led to the emergence of a Zionist leadership in Palestine that believed conflict with Britain was inevitable. Despite this, the Jewish Agency called on Palestine's Jewish youth to volunteer for the British Army. 30,000 Palestinian Jews and 12,000 Palestinian Arabs enlisted in the British armed forces during the war. In June 1944 the British agreed to create a Jewish Brigade that would fight in Italy. Approximately 1.5 million Jews around the world served in every branch of the allied armies, mainly in the Soviet and US armies. 200,000 Jews died serving in the Soviet army alone. A small group (about 200 activists), dedicated to resisting the British administration in Palestine, broke away from the Etzel (which advocated support for Britain during the war) and formed the "Lehi" (Stern Gang), led by Avraham Stern. In 1942, the USSR released the Revisionist Zionist leader Menachem Begin from the Gulag and he went to Palestine, taking command of the Etzel organization with a policy of increased conflict against the British. At about the same time Yitzhak Shamir escaped from the camp in Eritrea where the British were holding Lehi activists without trial, taking command of the Lehi (Stern Gang). Jews in the Middle East were also affected by the war. Most of North Africa came under Nazi control and many Jews were used as slaves. The 1941 pro-Axis coup in Iraq was accompanied by massacres of Jews. The Jewish Agency put together plans for a last stand in the event of Rommel invading Palestine (the Nazis planned to exterminate Palestine's Jews). Between 1939 and 1945, the Nazis, aided by local forces, led systematic efforts to kill every person of Jewish extraction in Europe (The Holocaust), causing the deaths of approximately 6 million Jews. A quarter of those killed were children. The Polish and German Jewish communities, which played an important role in defining the pre-1945 Jewish world, mostly ceased to exist. In the United States and Palestine, Jews of European origin became disconnected from their families and roots. As the Holocaust mainly affected Ashkenazi Jews, Sepharadi and Mizrahi Jews, who had been a minority, became a much more significant factor in the Jewish world. Those Jews who survived in central Europe, were displaced persons (refugees); an Anglo-American Committee of Inquiry, established to examine the Palestine issue, surveyed their ambitions and found that over 95% wanted to migrate to Palestine. In the Zionist movement the moderate Pro-British (and British citizen) Weizmann, whose son died flying in the RAF, was undermined by Britain's anti-Zionist policies. Leadership of the movement passed to the Jewish Agency in Palestine, now led by the anti-British Socialist-Zionist party (Mapai) led by David Ben-Gurion. The British Empire was severely weakened by the war. In the Middle East, the war had made Britain conscious of its dependence on Arab oil. Shortly after VE Day, the Labour Party won the general election in Britain. Although Labour Party conferences had for years called for the establishment of a Jewish state in Palestine, the Labour government now decided to maintain the 1939 White Paper policies. Illegal migration (Aliyah Bet) became the main form of Jewish entry into Palestine. Across Europe Bricha ("flight"), an organization of former partisans and ghetto fighters, smuggled Holocaust survivors from Eastern Europe to Mediterranean ports, where small boats tried to breach the British blockade of Palestine. Meanwhile, Jews from Arab countries began moving into Palestine overland. Despite British efforts to curb immigration, during the 14 years of the Aliyah Bet, over 110,000 Jews entered Palestine. By the end of World War II, the Jewish population of Palestine had increased to 33% of the total population. In an effort to win independence, Zionists now waged a guerrilla war against the British. The main underground Jewish militia, the Haganah, formed an alliance called the Jewish Resistance Movement with the Etzel and Stern Gang to fight the British. In June 1946, following instances of Jewish sabotage, such as in the Night of the Bridges, the British launched Operation Agatha, arresting 2,700 Jews, including the leadership of the Jewish Agency, whose headquarters were raided. Those arrested were held without trial. On 4 July 1946 a massive pogrom in Poland led to a wave of Holocaust survivors fleeing Europe for Palestine. Three weeks later, Irgun bombed the British Military Headquarters of the King David Hotel in Jerusalem, killing 91 people. In the days following the bombing, Tel Aviv was placed under curfew and over 120,000 Jews, nearly 20% of the Jewish population of Palestine, were questioned by the police. In the US, Congress criticized British handling of the situation and considered delaying loans that were vital to British post-war recovery. The alliance between Haganah and Etzel was dissolved after the King David bombings. Between 1945 and 1948, 100,000–120,000 Jews left Poland. Their departure was largely organized by Zionist activists under the umbrella of the semi-clandestine organization Berihah ("Flight"). Berihah was also responsible for the organized emigration of Jews from Romania, Hungary, Czechoslovakia and Yugoslavia, totalling 250,000 (including Poland) Holocaust survivors. The British imprisoned the Jews trying to enter Palestine in the Atlit detainee camp and Cyprus internment camps. Those held were mainly Holocaust survivors, including large numbers of children and orphans. In response to Cypriot fears that the Jews would never leave and because the 75,000 quota established by the 1939 White Paper had never been filled, the British allowed the refugees to enter Palestine at a rate of 750 per month. On 2 April 1947, the United Kingdom requested that the question of Palestine be handled by the General Assembly. The General Assembly created a committee, United Nations Special Committee on Palestine (UNSCOP), to report on "the question of Palestine". In July 1947 the UNSCOP visited Palestine and met with Jewish and Zionist delegations. The Arab Higher Committee boycotted the meetings. During the visit the British Foreign Secretary Ernest Bevin ordered that passengers from an Aliyah Bet ship, SS Exodus 1947, be sent back to Europe. The Holocaust surviving migrants on the ship were forcibly removed by British troops at Hamburg, Germany. The principal non-Zionist Orthodox Jewish (or Haredi) party, Agudat Israel, recommended to UNSCOP that a Jewish state be set up after reaching a religious status quo agreement with Ben-Gurion. The agreement granted an exemption from military service to a quota of yeshiva (religious seminary) students and to all Orthodox women, made the Sabbath the national weekend, guaranteed kosher food in government institutions and allowed Orthodox Jews to maintain a separate education system. The majority report of UNSCOP proposed "an independent Arab State, an independent Jewish State, and the City of Jerusalem", the last to be under "an International Trusteeship System". On 29 November 1947, in Resolution 181 (II), the General Assembly adopted the majority report of UNSCOP, but with slight modifications. The Plan also called for the British to allow "substantial" Jewish migration by 1 February 1948. Neither Britain nor the UN Security Council took any action to implement the recommendation made by the resolution and Britain continued detaining Jews attempting to enter Palestine. Concerned that partition would severely damage Anglo-Arab relations, Britain denied UN representatives access to Palestine during the period between the adoption of Resolution 181 (II) and the termination of the British Mandate. The British withdrawal was completed in May 1948. However, Britain continued to hold Jewish immigrants of "fighting age" and their families on Cyprus until March 1949. The General Assembly's vote caused joy in the Jewish community and anger in the Arab community. Violence broke out between the sides, escalating into civil war. From January 1948, operations became increasingly militarized, with the intervention of a number of Arab Liberation Army regiments inside Palestine, each active in a variety of distinct sectors around the different coastal towns. They consolidated their presence in Galilee and Samaria. Abd al-Qadir al-Husayni came from Egypt with several hundred men of the Army of the Holy War. Having recruited a few thousand volunteers, he organized the blockade of the 100,000 Jewish residents of Jerusalem. The Yishuv tried to supply the city using convoys of up to 100 armoured vehicles, but largely failed. By March, almost all Haganah's armoured vehicles had been destroyed, the blockade was in full operation, and hundreds of Haganah members who had tried to bring supplies into the city were killed. Up to 100,000 Arabs, from the urban upper and middle classes in Haifa, Jaffa and Jerusalem, or Jewish-dominated areas, evacuated abroad or to Arab centres eastwards. This situation caused the US to withdraw their support for the Partition plan, thus encouraging the Arab League to believe that the Palestinian Arabs, reinforced by the Arab Liberation Army, could put an end to the plan for partition. The British, on the other hand, decided on 7 February 1948 to support the annexation of the Arab part of Palestine by Transjordan. The Jordanian army was commanded by the British. David Ben-Gurion reorganized the Haganah and made conscription obligatory. Every Jewish man and woman in the country had to receive military training. Thanks to funds raised by Golda Meir from sympathisers in the United States, and Stalin's decision to support the Zionist cause, the Jewish representatives of Palestine were able to purchase important arms in Eastern Europe. Ben-Gurion gave Yigael Yadin the responsibility to plan for the announced intervention of the Arab states. The result of his analysis was Plan Dalet, in which Haganah passed from the defensive to the offensive. The plan sought to establish Jewish territorial continuity by conquering mixed zones. Tiberias, Haifa, Safed, Beisan, Jaffa and Acre fell, resulting in the flight of more than 250,000 Palestinian Arabs. On 14 May 1948, on the day the last British forces left Haifa, the Jewish People's Council gathered at the Tel Aviv Museum and proclaimed the establishment of a Jewish state, to be known as the State of Israel. State of Israel In 1948, following the 1947–1948 war in Mandatory Palestine, the Israeli Declaration of Independence sparked the 1948 Arab–Israeli War. This resulted in the 1948 Palestinian expulsion and flight from the land that the State of Israel came to control, and led to waves of Jewish immigration from other parts of the Middle East. The latter half of the 20th century saw further conflicts between Israel and its neighbouring Arab nations. In 1967, the Six-Day War erupted; in its aftermath, Israel captured and occupied the Golan Heights from Syria, the West Bank from Jordan, and the Gaza Strip and the Sinai Peninsula from Egypt. In 1973, the Yom Kippur War began with an attack by Egypt on the Israeli-occupied Sinai Peninsula. In 1979, the Egypt–Israel peace treaty was signed, based on the Camp David Accords. In 1993, Israel signed the Oslo I Accord with the Palestine Liberation Organization, which was followed by the establishment of the Palestinian National Authority. In 1994, the Israel–Jordan peace treaty was signed. Despite efforts to finalize the peace agreement, the conflict continues. Demographics See also Notes References Further reading External links Israeli settlementsTimeline, International law West BankJudea and Samaria Area Gaza StripHof Aza Regional Council |
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Contents Elon Musk Elon Reeve Musk (/ˈiːlɒn/ EE-lon; born June 28, 1971) is a businessman and entrepreneur known for his leadership of Tesla, SpaceX, Twitter, and xAI. Musk has been the wealthiest person in the world since 2025; as of February 2026,[update] Forbes estimates his net worth to be around US$852 billion. Born into a wealthy family in Pretoria, South Africa, Musk emigrated in 1989 to Canada; he has Canadian citizenship since his mother was born there. He received bachelor's degrees in 1997 from the University of Pennsylvania before moving to California to pursue business ventures. In 1995, Musk co-founded the software company Zip2. Following its sale in 1999, he co-founded X.com, an online payment company that later merged to form PayPal, which was acquired by eBay in 2002. Musk also became an American citizen in 2002. In 2002, Musk founded the space technology company SpaceX, becoming its CEO and chief engineer; the company has since led innovations in reusable rockets and commercial spaceflight. Musk joined the automaker Tesla as an early investor in 2004 and became its CEO and product architect in 2008; it has since become a leader in electric vehicles. In 2015, he co-founded OpenAI to advance artificial intelligence (AI) research, but later left; growing discontent with the organization's direction and their leadership in the AI boom in the 2020s led him to establish xAI, which became a subsidiary of SpaceX in 2026. In 2022, he acquired the social network Twitter, implementing significant changes, and rebranding it as X in 2023. His other businesses include the neurotechnology company Neuralink, which he co-founded in 2016, and the tunneling company the Boring Company, which he founded in 2017. In November 2025, a Tesla pay package worth $1 trillion for Musk was approved, which he is to receive over 10 years if he meets specific goals. Musk was the largest donor in the 2024 U.S. presidential election, where he supported Donald Trump. After Trump was inaugurated as president in early 2025, Musk served as Senior Advisor to the President and as the de facto head of the Department of Government Efficiency (DOGE). After a public feud with Trump, Musk left the Trump administration and returned to managing his companies. Musk is a supporter of global far-right figures, causes, and political parties. His political activities, views, and statements have made him a polarizing figure. Musk has been criticized for COVID-19 misinformation, promoting conspiracy theories, and affirming antisemitic, racist, and transphobic comments. His acquisition of Twitter was controversial due to a subsequent increase in hate speech and the spread of misinformation on the service, following his pledge to decrease censorship. His role in the second Trump administration attracted public backlash, particularly in response to DOGE. The emails he sent to Jeffrey Epstein are included in the Epstein files, which were published between 2025–26 and became a topic of worldwide debate. Early life Elon Reeve Musk was born on June 28, 1971, in Pretoria, South Africa's administrative capital. He is of British and Pennsylvania Dutch ancestry. His mother, Maye (née Haldeman), is a model and dietitian born in Saskatchewan, Canada, and raised in South Africa. Musk therefore holds both South African and Canadian citizenship from birth. His father, Errol Musk, is a South African electromechanical engineer, pilot, sailor, consultant, emerald dealer, and property developer, who partly owned a rental lodge at Timbavati Private Nature Reserve. His maternal grandfather, Joshua N. Haldeman, who died in a plane crash when Elon was a toddler, was an American-born Canadian chiropractor, aviator and political activist in the technocracy movement who moved to South Africa in 1950. Elon has a younger brother, Kimbal, a younger sister, Tosca, and four paternal half-siblings. Musk was baptized as a child in the Anglican Church of Southern Africa. Despite both Elon and Errol previously stating that Errol was a part owner of a Zambian emerald mine, in 2023, Errol recounted that the deal he made was to receive "a portion of the emeralds produced at three small mines". Errol was elected to the Pretoria City Council as a representative of the anti-apartheid Progressive Party and has said that his children shared their father's dislike of apartheid. After his parents divorced in 1979, Elon, aged around 9, chose to live with his father because Errol Musk had an Encyclopædia Britannica and a computer. Elon later regretted his decision and became estranged from his father. Elon has recounted trips to a wilderness school that he described as a "paramilitary Lord of the Flies" where "bullying was a virtue" and children were encouraged to fight over rations. In one incident, after an altercation with a fellow pupil, Elon was thrown down concrete steps and beaten severely, leading to him being hospitalized for his injuries. Elon described his father berating him after he was discharged from the hospital. Errol denied berating Elon and claimed, "The [other] boy had just lost his father to suicide, and Elon had called him stupid. Elon had a tendency to call people stupid. How could I possibly blame that child?" Elon was an enthusiastic reader of books, and had attributed his success in part to having read The Lord of the Rings, the Foundation series, and The Hitchhiker's Guide to the Galaxy. At age ten, he developed an interest in computing and video games, teaching himself how to program from the VIC-20 user manual. At age twelve, Elon sold his BASIC-based game Blastar to PC and Office Technology magazine for approximately $500 (equivalent to $1,600 in 2025). Musk attended Waterkloof House Preparatory School, Bryanston High School, and then Pretoria Boys High School, where he graduated. Musk was a decent but unexceptional student, earning a 61/100 in Afrikaans and a B on his senior math certification. Musk applied for a Canadian passport through his Canadian-born mother to avoid South Africa's mandatory military service, which would have forced him to participate in the apartheid regime, as well as to ease his path to immigration to the United States. While waiting for his application to be processed, he attended the University of Pretoria for five months. Musk arrived in Canada in June 1989, connected with a second cousin in Saskatchewan, and worked odd jobs, including at a farm and a lumber mill. In 1990, he entered Queen's University in Kingston, Ontario. Two years later, he transferred to the University of Pennsylvania, where he studied until 1995. Although Musk has said that he earned his degrees in 1995, the University of Pennsylvania did not award them until 1997 – a Bachelor of Arts in physics and a Bachelor of Science in economics from the university's Wharton School. He reportedly hosted large, ticketed house parties to help pay for tuition, and wrote a business plan for an electronic book-scanning service similar to Google Books. In 1994, Musk held two internships in Silicon Valley: one at energy storage startup Pinnacle Research Institute, which investigated electrolytic supercapacitors for energy storage, and another at Palo Alto–based startup Rocket Science Games. In 1995, he was accepted to a graduate program in materials science at Stanford University, but did not enroll. Musk decided to join the Internet boom of the 1990s, applying for a job at Netscape, to which he reportedly never received a response. The Washington Post reported that Musk lacked legal authorization to remain and work in the United States after failing to enroll at Stanford. In response, Musk said he was allowed to work at that time and that his student visa transitioned to an H1-B. According to numerous former business associates and shareholders, Musk said he was on a student visa at the time. Business career In 1995, Musk, his brother Kimbal, and Greg Kouri founded the web software company Zip2 with funding from a group of angel investors. They housed the venture at a small rented office in Palo Alto. Replying to Rolling Stone, Musk denounced the notion that they started their company with funds borrowed from Errol Musk, but in a tweet, he recognized that his father contributed 10% of a later funding round. The company developed and marketed an Internet city guide for the newspaper publishing industry, with maps, directions, and yellow pages. According to Musk, "The website was up during the day and I was coding it at night, seven days a week, all the time." To impress investors, Musk built a large plastic structure around a standard computer to create the impression that Zip2 was powered by a small supercomputer. The Musk brothers obtained contracts with The New York Times and the Chicago Tribune, and persuaded the board of directors to abandon plans for a merger with CitySearch. Musk's attempts to become CEO were thwarted by the board. Compaq acquired Zip2 for $307 million in cash in February 1999 (equivalent to $590,000,000 in 2025), and Musk received $22 million (equivalent to $43,000,000 in 2025) for his 7-percent share. In 1999, Musk co-founded X.com, an online financial services and e-mail payment company. The startup was one of the first federally insured online banks, and, in its initial months of operation, over 200,000 customers joined the service. The company's investors regarded Musk as inexperienced and replaced him with Intuit CEO Bill Harris by the end of the year. The following year, X.com merged with online bank Confinity to avoid competition. Founded by Max Levchin and Peter Thiel, Confinity had its own money-transfer service, PayPal, which was more popular than X.com's service. Within the merged company, Musk returned as CEO. Musk's preference for Microsoft software over Unix created a rift in the company and caused Thiel to resign. Due to resulting technological issues and lack of a cohesive business model, the board ousted Musk and replaced him with Thiel in 2000.[b] Under Thiel, the company focused on the PayPal service and was renamed PayPal in 2001. In 2002, PayPal was acquired by eBay for $1.5 billion (equivalent to $2,700,000,000 in 2025) in stock, of which Musk—the largest shareholder with 11.72% of shares—received $175.8 million (equivalent to $320,000,000 in 2025). In 2017, Musk purchased the domain X.com from PayPal for an undisclosed amount, stating that it had sentimental value. In 2001, Musk became involved with the nonprofit Mars Society and discussed funding plans to place a growth-chamber for plants on Mars. Seeking a way to launch the greenhouse payloads into space, Musk made two unsuccessful trips to Moscow to purchase intercontinental ballistic missiles (ICBMs) from Russian companies NPO Lavochkin and Kosmotras. Musk instead decided to start a company to build affordable rockets. With $100 million of his early fortune, (equivalent to $180,000,000 in 2025) Musk founded SpaceX in May 2002 and became the company's CEO and Chief Engineer. SpaceX attempted its first launch of the Falcon 1 rocket in 2006. Although the rocket failed to reach Earth orbit, it was awarded a Commercial Orbital Transportation Services program contract from NASA, then led by Mike Griffin. After two more failed attempts that nearly caused Musk to go bankrupt, SpaceX succeeded in launching the Falcon 1 into orbit in 2008. Later that year, SpaceX received a $1.6 billion NASA contract (equivalent to $2,400,000,000 in 2025) for Falcon 9-launched Dragon spacecraft flights to the International Space Station (ISS), replacing the Space Shuttle after its 2011 retirement. In 2012, the Dragon vehicle docked with the ISS, a first for a commercial spacecraft. Working towards its goal of reusable rockets, in 2015 SpaceX successfully landed the first stage of a Falcon 9 on a land platform. Later landings were achieved on autonomous spaceport drone ships, an ocean-based recovery platform. In 2018, SpaceX launched the Falcon Heavy; the inaugural mission carried Musk's personal Tesla Roadster as a dummy payload. Since 2019, SpaceX has been developing Starship, a reusable, super heavy-lift launch vehicle intended to replace the Falcon 9 and Falcon Heavy. In 2020, SpaceX launched its first crewed flight, the Demo-2, becoming the first private company to place astronauts into orbit and dock a crewed spacecraft with the ISS. In 2024, NASA awarded SpaceX an $843 million (equivalent to $865,000,000 in 2025) contract to build a spacecraft that NASA will use to deorbit the ISS at the end of its lifespan. In 2015, SpaceX began development of the Starlink constellation of low Earth orbit satellites to provide satellite Internet access. After the launch of prototype satellites in 2018, the first large constellation was deployed in May 2019. As of May 2025[update], over 7,600 Starlink satellites are operational, comprising 65% of all operational Earth satellites. The total cost of the decade-long project to design, build, and deploy the constellation was estimated by SpaceX in 2020 to be $10 billion (equivalent to $12,000,000,000 in 2025).[c] During the Russian invasion of Ukraine, Musk provided free Starlink service to Ukraine, permitting Internet access and communication at a yearly cost to SpaceX of $400 million (equivalent to $440,000,000 in 2025). However, Musk refused to block Russian state media on Starlink. In 2023, Musk denied Ukraine's request to activate Starlink over Crimea to aid an attack against the Russian navy, citing fears of a nuclear response. Tesla, Inc., originally Tesla Motors, was incorporated in July 2003 by Martin Eberhard and Marc Tarpenning. Both men played active roles in the company's early development prior to Musk's involvement. Musk led the Series A round of investment in February 2004; he invested $6.35 million (equivalent to $11,000,000 in 2025), became the majority shareholder, and joined Tesla's board of directors as chairman. Musk took an active role within the company and oversaw Roadster product design, but was not deeply involved in day-to-day business operations. Following a series of escalating conflicts in 2007 and the 2008 financial crisis, Eberhard was ousted from the firm.[page needed] Musk assumed leadership of the company as CEO and product architect in 2008. A 2009 lawsuit settlement with Eberhard designated Musk as a Tesla co-founder, along with Tarpenning and two others. Tesla began delivery of the Roadster, an electric sports car, in 2008. With sales of about 2,500 vehicles, it was the first mass production all-electric car to use lithium-ion battery cells. Under Musk, Tesla has since launched several well-selling electric vehicles, including the four-door sedan Model S (2012), the crossover Model X (2015), the mass-market sedan Model 3 (2017), the crossover Model Y (2020), and the pickup truck Cybertruck (2023). In May 2020, Musk resigned as chairman of the board as part of the settlement of a lawsuit from the SEC over him tweeting that funding had been "secured" for potentially taking Tesla private. The company has also constructed multiple lithium-ion battery and electric vehicle factories, called Gigafactories. Since its initial public offering in 2010, Tesla stock has risen significantly; it became the most valuable carmaker in summer 2020, and it entered the S&P 500 later that year. In October 2021, it reached a market capitalization of $1 trillion (equivalent to $1,200,000,000,000 in 2025), the sixth company in U.S. history to do so. Musk provided the initial concept and financial capital for SolarCity, which his cousins Lyndon and Peter Rive founded in 2006. By 2013, SolarCity was the second largest provider of solar power systems in the United States. In 2014, Musk promoted the idea of SolarCity building an advanced production facility in Buffalo, New York, triple the size of the largest solar plant in the United States. Construction of the factory started in 2014 and was completed in 2017. It operated as a joint venture with Panasonic until early 2020. Tesla acquired SolarCity for $2 billion in 2016 (equivalent to $2,700,000,000 in 2025) and merged it with its battery unit to create Tesla Energy. The deal's announcement resulted in a more than 10% drop in Tesla's stock price; at the time, SolarCity was facing liquidity issues. Multiple shareholder groups filed a lawsuit against Musk and Tesla's directors, stating that the purchase of SolarCity was done solely to benefit Musk and came at the expense of Tesla and its shareholders. Tesla directors settled the lawsuit in January 2020, leaving Musk the sole remaining defendant. Two years later, the court ruled in Musk's favor. In 2016, Musk co-founded Neuralink, a neurotechnology startup, with an investment of $100 million. Neuralink aims to integrate the human brain with artificial intelligence (AI) by creating devices that are embedded in the brain. Such technology could enhance memory or allow the devices to communicate with software. The company also hopes to develop devices to treat neurological conditions like spinal cord injuries. In 2022, Neuralink announced that clinical trials would begin by the end of the year. In September 2023, the Food and Drug Administration approved Neuralink to initiate six-year human trials. Neuralink has conducted animal testing on macaques at the University of California, Davis. In 2021, the company released a video in which a macaque played the video game Pong via a Neuralink implant. The company's animal trials—which have caused the deaths of some monkeys—have led to claims of animal cruelty. The Physicians Committee for Responsible Medicine has alleged that Neuralink violated the Animal Welfare Act. Employees have complained that pressure from Musk to accelerate development has led to botched experiments and unnecessary animal deaths. In 2022, a federal probe was launched into possible animal welfare violations by Neuralink.[needs update] In 2017, Musk founded the Boring Company to construct tunnels; he also revealed plans for specialized, underground, high-occupancy vehicles that could travel up to 150 miles per hour (240 km/h) and thus circumvent above-ground traffic in major cities. Early in 2017, the company began discussions with regulatory bodies and initiated construction of a 30-foot (9.1 m) wide, 50-foot (15 m) long, and 15-foot (4.6 m) deep "test trench" on the premises of SpaceX's offices, as that required no permits. The Los Angeles tunnel, less than two miles (3.2 km) in length, debuted to journalists in 2018. It used Tesla Model Xs and was reported to be a rough ride while traveling at suboptimal speeds. Two tunnel projects announced in 2018, in Chicago and West Los Angeles, have been canceled. A tunnel beneath the Las Vegas Convention Center was completed in early 2021. Local officials have approved further expansions of the tunnel system. April 14, 2022 In early 2017, Musk expressed interest in buying Twitter and had questioned the platform's commitment to freedom of speech. By 2022, Musk had reached 9.2% stake in the company, making him the largest shareholder.[d] Musk later agreed to a deal that would appoint him to Twitter's board of directors and prohibit him from acquiring more than 14.9% of the company. Days later, Musk made a $43 billion offer to buy Twitter. By the end of April Musk had successfully concluded his bid for approximately $44 billion. This included approximately $12.5 billion in loans and $21 billion in equity financing. Having backtracked on his initial decision, Musk bought the company on October 27, 2022. Immediately after the acquisition, Musk fired several top Twitter executives including CEO Parag Agrawal; Musk became the CEO instead. Under Elon Musk, Twitter instituted monthly subscriptions for a "blue check", and laid off a significant portion of the company's staff. Musk lessened content moderation and hate speech also increased on the platform after his takeover. In late 2022, Musk released internal documents relating to Twitter's moderation of Hunter Biden's laptop controversy in the lead-up to the 2020 presidential election. Musk also promised to step down as CEO after a Twitter poll, and five months later, Musk stepped down as CEO and transitioned his role to executive chairman and chief technology officer (CTO). Despite Musk stepping down as CEO, X continues to struggle with challenges such as viral misinformation, hate speech, and antisemitism controversies. Musk has been accused of trying to silence some of his critics such as Twitch streamer Asmongold, who criticized him during one of his streams. Musk has been accused of removing their accounts' blue checkmarks, which hinders visibility and is considered a form of shadow banning, or suspending their accounts without justification. Other activities In August 2013, Musk announced plans for a version of a vactrain, and assigned engineers from SpaceX and Tesla to design a transport system between Greater Los Angeles and the San Francisco Bay Area, at an estimated cost of $6 billion. Later that year, Musk unveiled the concept, dubbed the Hyperloop, intended to make travel cheaper than any other mode of transport for such long distances. In December 2015, Musk co-founded OpenAI, a not-for-profit artificial intelligence (AI) research company aiming to develop artificial general intelligence, intended to be safe and beneficial to humanity. Musk pledged $1 billion of funding to the company, and initially gave $50 million. In 2018, Musk left the OpenAI board. Since 2018, OpenAI has made significant advances in machine learning. In July 2023, Musk launched the artificial intelligence company xAI, which aims to develop a generative AI program that competes with existing offerings like OpenAI's ChatGPT. Musk obtained funding from investors in SpaceX and Tesla, and xAI hired engineers from Google and OpenAI. December 16, 2022 Musk uses a private jet owned by Falcon Landing LLC, a SpaceX-linked company, and acquired a second jet in August 2020. His heavy use of the jets and the consequent fossil fuel usage have received criticism. Musk's flight usage is tracked on social media through ElonJet. In December 2022, Musk banned the ElonJet account on Twitter, and made temporary bans on the accounts of journalists that posted stories regarding the incident, including Donie O'Sullivan, Keith Olbermann, and journalists from The New York Times, The Washington Post, CNN, and The Intercept. In October 2025, Musk's company xAI launched Grokipedia, an AI-generated online encyclopedia that he promoted as an alternative to Wikipedia. Articles on Grokipedia are generated and reviewed by xAI's Grok chatbot. Media coverage and academic analysis described Grokipedia as frequently reusing Wikipedia content but framing contested political and social topics in line with Musk's own views and right-wing narratives. A study by Cornell University researchers and NBC News stated that Grokipedia cites sources that are blacklisted or considered "generally unreliable" on Wikipedia, for example, the conspiracy site Infowars and the neo-Nazi forum Stormfront. Wired, The Guardian and Time criticized Grokipedia for factual errors and for presenting Musk himself in unusually positive terms while downplaying controversies. Politics Musk is an outlier among business leaders who typically avoid partisan political advocacy. Musk was a registered independent voter when he lived in California. Historically, he has donated to both Democrats and Republicans, many of whom serve in states in which he has a vested interest. Since 2022, his political contributions have mostly supported Republicans, with his first vote for a Republican going to Mayra Flores in the 2022 Texas's 34th congressional district special election. In 2024, he started supporting international far-right political parties, activists, and causes, and has shared misinformation and numerous conspiracy theories. Since 2024, his views have been generally described as right-wing. Musk supported Barack Obama in 2008 and 2012, Hillary Clinton in 2016, Joe Biden in 2020, and Donald Trump in 2024. In the 2020 Democratic Party presidential primaries, Musk endorsed candidate Andrew Yang and expressed support for Yang's proposed universal basic income, and endorsed Kanye West's 2020 presidential campaign. In 2021, Musk publicly expressed opposition to the Build Back Better Act, a $3.5 trillion legislative package endorsed by Joe Biden that ultimately failed to pass due to unanimous opposition from congressional Republicans and several Democrats. In 2022, gave over $50 million to Citizens for Sanity, a conservative political action committee. In 2023, he supported Republican Ron DeSantis for the 2024 U.S. presidential election, giving $10 million to his campaign, and hosted DeSantis's campaign announcement on a Twitter Spaces event. From June 2023 to January 2024, Musk hosted a bipartisan set of X Spaces with Republican and Democratic candidates, including Robert F. Kennedy Jr., Vivek Ramaswamy, and Dean Phillips. In October 2025, former vice-president Kamala Harris commented that it was a mistake from the Democratic side to not invite Musk to a White House electric vehicle event organized in August 2021 and featuring executives from General Motors, Ford and Stellantis, despite Tesla being "the major American manufacturer of extraordinary innovation in this space." Fortune remarked that this was a nod to United Auto Workers and organized labor. Harris said presidents should put aside political loyalties when it came to recognizing innovation, and guessed that the non-invitation impacted Musk's perspective. Fortune noted that, at the time, Musk said, "Yeah, seems odd that Tesla wasn't invited." A month later, he criticized Biden as "not the friendliest administration." Jacob Silverman, author of the book Gilded Rage: Elon Musk and the Radicalization of Silicon Valley, said that the tech industry represented by Musk, Thiel, Andreessen and other capitalists, actually flourished under Biden, but the tech leaders chose Trump for their common ground on cultural issues. By early 2024, Musk had become a vocal and financial supporter of Donald Trump. In July 2024, minutes after the attempted assassination of Donald Trump, Musk endorsed him for president saying; "I fully endorse President Trump and hope for his rapid recovery." During the presidential campaign, Musk joined Trump on stage at a campaign rally, and during the campaign promoted conspiracy theories and falsehoods about Democrats, election fraud and immigration, in support of Trump. Musk was the largest individual donor of the 2024 election. In 2025, Musk contributed $19 million to the Wisconsin Supreme Court race, hoping to influence the state's future redistricting efforts and its regulations governing car manufacturers and dealers. In 2023, Musk said he shunned the World Economic Forum because it was boring. The organization commented that they had not invited him since 2015. He has participated in Dialog, dubbed "Tech Bilderberg" and organized by Peter Thiel and Auren Hoffman, though. Musk's international political actions and comments have come under increasing scrutiny and criticism, especially from the governments and leaders of France, Germany, Norway, Spain and the United Kingdom, particularly due to his position in the U.S. government as well as ownership of X. An NBC News analysis found he had boosted far-right political movements to cut immigration and curtail regulation of business in at least 18 countries on six continents since 2023. During his speech after the second inauguration of Donald Trump, Musk twice made a gesture interpreted by many as a Nazi or a fascist Roman salute.[e] He thumped his right hand over his heart, fingers spread wide, and then extended his right arm out, emphatically, at an upward angle, palm down and fingers together. He then repeated the gesture to the crowd behind him. As he finished the gestures, he said to the crowd, "My heart goes out to you. It is thanks to you that the future of civilization is assured." It was widely condemned as an intentional Nazi salute in Germany, where making such gestures is illegal. The Anti-Defamation League said it was not a Nazi salute, but other Jewish organizations disagreed and condemned the salute. American public opinion was divided on partisan lines as to whether it was a fascist salute. Musk dismissed the accusations of Nazi sympathies, deriding them as "dirty tricks" and a "tired" attack. Neo-Nazi and white supremacist groups celebrated it as a Nazi salute. Multiple European political parties demanded that Musk be banned from entering their countries. The concept of DOGE emerged in a discussion between Musk and Donald Trump, and in August 2024, Trump committed to giving Musk an advisory role, with Musk accepting the offer. In November and December 2024, Musk suggested that the organization could help to cut the U.S. federal budget, consolidate the number of federal agencies, and eliminate the Consumer Financial Protection Bureau, and that its final stage would be "deleting itself". In January 2025, the organization was created by executive order, and Musk was designated a "special government employee". Musk led the organization and was a senior advisor to the president, although his official role is not clear. In sworn statement during a lawsuit, the director of the White House Office of Administration stated that Musk "is not an employee of the U.S. DOGE Service or U.S. DOGE Service Temporary Organization", "is not the U.S. DOGE Service administrator", and has "no actual or formal authority to make government decisions himself". Trump said two days later that he had put Musk in charge of DOGE. A federal judge has ruled that Musk acted as the de facto leader of DOGE. Musk's role in the second Trump administration, particularly in response to DOGE, has attracted public backlash. He was criticized for his treatment of federal government employees, including his influence over the mass layoffs of the federal workforce. He has prioritized secrecy within the organization and has accused others of violating privacy laws. A Senate report alleged that Musk could avoid up to $2 billion in legal liability as a result of DOGE's actions. In May 2025, Bill Gates accused Musk of "killing the world's poorest children" through his cuts to USAID, which modeling by Boston University estimated had resulted in 300,000 deaths by this time, most of them of children. By November 2025, the estimated death toll had increased to 400,000 children and 200,000 adults. Musk announced on May 28, 2025, that he would depart from the Trump administration as planned when the special government employee's 130 day deadline expired, with a White House official confirming that Musk's offboarding from the Trump administration was already underway. His departure was officially confirmed during a joint Oval Office press conference with Trump on May 30, 2025. @realDonaldTrump is in the Epstein files. That is the real reason they have not been made public. June 5, 2025 After leaving office, Musk criticized the Trump administration's Big Beautiful Bill, calling it a "disgusting abomination" due to its provisions increasing the deficit. A feud began between Musk and Trump, with its most notable event being Musk alleging Trump had ties to sex offender Jeffrey Epstein on X (formerly Twitter) on June 5, 2025. Trump responded on Truth Social stating that Musk went "CRAZY" after the "EV Mandate" was purportedly taken away and threatened to cut Musk's government contracts. Musk then called for a third Trump impeachment. The next day, Trump stated that he did not wish to reconcile with Musk, and added that Musk would face "very serious consequences" if he funds Democratic candidates. On June 11, Musk publicly apologized for the tweets against Trump, saying they "went too far". Views November 6, 2022 Rejecting the conservative label, Musk has described himself as a political moderate, even as his views have become more right-wing over time. His views have been characterized as libertarian and far-right, and after his involvement in European politics, they have received criticism from world leaders such as Emmanuel Macron and Olaf Scholz. Within the context of American politics, Musk supported Democratic candidates up until 2022, at which point he voted for a Republican for the first time. He has stated support for universal basic income, gun rights, freedom of speech, a tax on carbon emissions, and H-1B visas. Musk has expressed concern about issues such as artificial intelligence (AI) and climate change, and has been a critic of wealth tax, short-selling, and government subsidies. An immigrant himself, Musk has been accused of being anti-immigration, and regularly blames immigration policies for illegal immigration. He is also a pronatalist who believes population decline is the biggest threat to civilization, and identifies as a cultural Christian. Musk has long been an advocate for space colonization, especially the colonization of Mars. He has repeatedly pushed for humanity colonizing Mars, in order to become an interplanetary species and lower the risks of human extinction. Musk has promoted conspiracy theories and made controversial statements that have led to accusations of racism, sexism, antisemitism, transphobia, disseminating disinformation, and support of white pride. While describing himself as a "pro-Semite", his comments regarding George Soros and Jewish communities have been condemned by the Anti-Defamation League and the Biden White House. Musk was criticized during the COVID-19 pandemic for making unfounded epidemiological claims, defying COVID-19 lockdowns restrictions, and supporting the Canada convoy protest against vaccine mandates. He has amplified false claims of white genocide in South Africa. Musk has been critical of Israel's actions in the Gaza Strip during the Gaza war, praised China's economic and climate goals, suggested that Taiwan and China should resolve cross-strait relations, and was described as having a close relationship with the Chinese government. In Europe, Musk expressed support for Ukraine in 2022 during the Russian invasion, recommended referendums and peace deals on the annexed Russia-occupied territories, and supported the far-right Alternative for Germany political party in 2024. Regarding British politics, Musk blamed the 2024 UK riots on mass migration and open borders, criticized Prime Minister Keir Starmer for what he described as a "two-tier" policing system, and was subsequently attacked as being responsible for spreading misinformation and amplifying the far-right. He has also voiced his support for far-right activist Tommy Robinson and pledged electoral support for Reform UK. In February 2026, Musk described Spanish Prime Minister Pedro Sánchez as a "tyrant" following Sánchez's proposal to prohibit minors under the age of 16 from accessing social media platforms. Legal affairs In 2018, Musk was sued by the U.S. Securities and Exchange Commission (SEC) for a tweet stating that funding had been secured for potentially taking Tesla private.[f] The securities fraud lawsuit characterized the tweet as false, misleading, and damaging to investors, and sought to bar Musk from serving as CEO of publicly traded companies. Two days later, Musk settled with the SEC, without admitting or denying the SEC's allegations. As a result, Musk and Tesla were fined $20 million each, and Musk was forced to step down for three years as Tesla chairman but was able to remain as CEO. Shareholders filed a lawsuit over the tweet, and in February 2023, a jury found Musk and Tesla not liable. Musk has stated in interviews that he does not regret posting the tweet that triggered the SEC investigation. In 2019, Musk stated in a tweet that Tesla would build half a million cars that year. The SEC reacted by asking a court to hold him in contempt for violating the terms of the 2018 settlement agreement. A joint agreement between Musk and the SEC eventually clarified the previous agreement details, including a list of topics about which Musk needed preclearance. In 2020, a judge blocked a lawsuit that claimed a tweet by Musk regarding Tesla stock price ("too high imo") violated the agreement. Freedom of Information Act (FOIA)-released records showed that the SEC concluded Musk had subsequently violated the agreement twice by tweeting regarding "Tesla's solar roof production volumes and its stock price". In October 2023, the SEC sued Musk over his refusal to testify a third time in an investigation into whether he violated federal law by purchasing Twitter stock in 2022. In February 2024, Judge Laurel Beeler ruled that Musk must testify again. In January 2025, the SEC filed a lawsuit against Musk for securities violations related to his purchase of Twitter. In January 2024, Delaware judge Kathaleen McCormick ruled in a 2018 lawsuit that Musk's $55 billion pay package from Tesla be rescinded. McCormick called the compensation granted by the company's board "an unfathomable sum" that was unfair to shareholders. The Delaware Supreme Court overturned McCormick's decision in December 2025, restoring Musk's compensation package and awarding $1 in nominal damages. Personal life Musk became a U.S. citizen in 2002. From the early 2000s until late 2020, Musk resided in California, where both Tesla and SpaceX were founded. He then relocated to Cameron County, Texas, saying that California had become "complacent" about its economic success. While hosting Saturday Night Live in 2021, Musk stated that he has Asperger syndrome (an outdated term for autism spectrum disorder). When asked about his experience growing up with Asperger's syndrome in a TED2022 conference in Vancouver, Musk stated that "the social cues were not intuitive ... I would just tend to take things very literally ... but then that turned out to be wrong — [people were not] simply saying exactly what they mean, there's all sorts of other things that are meant, and [it] took me a while to figure that out." Musk suffers from back pain and has undergone several spine-related surgeries, including a disc replacement. In 2000, he contracted a severe case of malaria while on vacation in South Africa. Musk has stated he uses doctor-prescribed ketamine for occasional depression and that he doses "a small amount once every other week or something like that"; since January 2024, some media outlets have reported that he takes ketamine, marijuana, LSD, ecstasy, mushrooms, cocaine and other drugs. Musk at first refused to comment on his alleged drug use, before responding that he had not tested positive for drugs, and that if drugs somehow improved his productivity, "I would definitely take them!". The New York Times' investigations revealed Musk's overuse of ketamine and numerous other drugs, as well as strained family relationships and concerns from close associates who have become troubled by his public behavior as he became more involved in political activities and government work. According to The Washington Post, President Trump described Musk as "a big-time drug addict". Through his own label Emo G Records, Musk released a rap track, "RIP Harambe", on SoundCloud in March 2019. The following year, he released an EDM track, "Don't Doubt Ur Vibe", featuring his own lyrics and vocals. Musk plays video games, which he stated has a "'restoring effect' that helps his 'mental calibration'". Some games he plays include Quake, Diablo IV, Elden Ring, and Polytopia. Musk once claimed to be one of the world's top video game players but has since admitted to "account boosting", or cheating by hiring outside services to achieve top player rankings. Musk has justified the boosting by claiming that all top accounts do it so he has to as well to remain competitive. In 2024 and 2025, Musk criticized the video game Assassin's Creed Shadows and its creator Ubisoft for "woke" content. Musk posted to X that "DEI kills art" and specified the inclusion of the historical figure Yasuke in the Assassin's Creed game as offensive; he also called the game "terrible". Ubisoft responded by saying that Musk's comments were "just feeding hatred" and that they were focused on producing a game not pushing politics. Musk has fathered at least 14 children, one of whom died as an infant. The Wall Street Journal reported in 2025 that sources close to Musk suggest that the "true number of Musk's children is much higher than publicly known". He had six children with his first wife, Canadian author Justine Wilson, whom he met while attending Queen's University in Ontario, Canada; they married in 2000. In 2002, their first child Nevada Musk died of sudden infant death syndrome at the age of 10 weeks. After his death, the couple used in vitro fertilization (IVF) to continue their family; they had twins in 2004, followed by triplets in 2006. The couple divorced in 2008 and have shared custody of their children. The elder twin he had with Wilson came out as a trans woman and, in 2022, officially changed her name to Vivian Jenna Wilson, adopting her mother's surname because she no longer wished to be associated with Musk. Musk began dating English actress Talulah Riley in 2008. They married two years later at Dornoch Cathedral in Scotland. In 2012, the couple divorced, then remarried the following year. After briefly filing for divorce in 2014, Musk finalized a second divorce from Riley in 2016. Musk then dated the American actress Amber Heard for several months in 2017; he had reportedly been "pursuing" her since 2012. In 2018, Musk and Canadian musician Grimes confirmed they were dating. Grimes and Musk have three children, born in 2020, 2021, and 2022.[g] Musk and Grimes originally gave their eldest child the name "X Æ A-12", which would have violated California regulations as it contained characters that are not in the modern English alphabet; the names registered on the birth certificate are "X" as a first name, "Æ A-Xii" as a middle name, and "Musk" as a last name. They received criticism for choosing a name perceived to be impractical and difficult to pronounce; Musk has said the intended pronunciation is "X Ash A Twelve". Their second child was born via surrogacy. Despite the pregnancy, Musk confirmed reports that the couple were "semi-separated" in September 2021; in an interview with Time in December 2021, he said he was single. In October 2023, Grimes sued Musk over parental rights and custody of X Æ A-Xii. Elon Musk has taken X Æ A-Xii to multiple official events in Washington, D.C. during Trump's second term in office. Also in July 2022, The Wall Street Journal reported that Musk allegedly had an affair with Nicole Shanahan, the wife of Google co-founder Sergey Brin, in 2021, leading to their divorce the following year. Musk denied the report. Musk also had a relationship with Australian actress Natasha Bassett, who has been described as "an occasional girlfriend". In October 2024, The New York Times reported Musk bought a Texas compound for his children and their mothers, though Musk denied having done so. Musk also has four children with Shivon Zilis, director of operations and special projects at Neuralink: twins born via IVF in 2021, a child born in 2024 via surrogacy and a child born in 2025.[h] On February 14, 2025, Ashley St. Clair, an influencer and author, posted on X claiming to have given birth to Musk's son Romulus five months earlier, which media outlets reported as Musk's supposed thirteenth child.[i] On February 22, 2025, it was reported that St Clair had filed for sole custody of her five-month-old son and for Musk to be recognised as the child's father. On March 31, 2025, Musk wrote that, while he was unsure if he was the father of St. Clair's child, he had paid St. Clair $2.5 million and would continue paying her $500,000 per year.[j] Later reporting from the Wall Street Journal indicated that $1 million of these payments to St. Clair were structured as a loan. In 2014, Musk and Ghislaine Maxwell appeared together in a photograph taken at an Academy Awards after-party, which Musk later described as a "photobomb". The January 2026 Epstein files contain emails between Musk and Epstein from 2012 to 2013, after Epstein's first conviction. Emails released on January 30, 2026, indicated that Epstein invited Musk to visit his private island on multiple occasions. The correspondence showed that while Epstein repeatedly encouraged Musk to attend, Musk did not visit the island. In one instance, Musk discussed the possibility of attending a party with his then-wife Talulah Riley and asked which day would be the "wildest party"; according to the emails, the visit did not take place after Epstein later cancelled the plans.[k] On Christmas day in 2012, Musk emailed Epstein asking "Do you have any parties planned? I’ve been working to the edge of sanity this year and so, once my kids head home after Christmas, I really want to hit the party scene in St Barts or elsewhere and let loose. The invitation is much appreciated, but a peaceful island experience is the opposite of what I’m looking for". Epstein replied that the "ratio on my island" might make Musk's wife uncomfortable to which Musk responded, "Ratio is not a problem for Talulah". On September 11, 2013, Epstein sent an email asking Musk if he had any plans for coming to New York for the opening of the United Nations General Assembly where many "interesting people" would be coming to his house to which Musk responded that "Flying to NY to see UN diplomats do nothing would be an unwise use of time". Epstein responded by stating "Do you think i am retarded. Just kidding, there is no one over 25 and all very cute." Musk has denied any close relationship with Epstein and described him as a "creep" who attempted to ingratiate himself with influential people. When Musk was asked in 2019 if he introduced Epstein to Mark Zuckerberg, Musk responded: "I don’t recall introducing Epstein to anyone, as I don’t know the guy well enough to do so." The released emails nonetheless showed cordial exchanges on a range of topics, including Musk's inquiry about parties on the island. The correspondence also indicated that Musk suggested hosting Epstein at SpaceX, while Epstein separately discussed plans to tour SpaceX and bring "the girls", though there is no evidence that such a visit occurred. Musk has described the release of the files a "distraction", later accusing the second Trump administration of suppressing them to protect powerful individuals, including Trump himself.[l] Wealth Elon Musk is the wealthiest person in the world, with an estimated net worth of US$690 billion as of January 2026, according to the Bloomberg Billionaires Index, and $852 billion according to Forbes, primarily from his ownership stakes in SpaceX and Tesla. Having been first listed on the Forbes Billionaires List in 2012, around 75% of Musk's wealth was derived from Tesla stock in November 2020, although he describes himself as "cash poor". According to Forbes, he became the first person in the world to achieve a net worth of $300 billion in 2021; $400 billion in December 2024; $500 billion in October 2025; $600 billion in mid-December 2025; $700 billion later that month; and $800 billion in February 2026. In November 2025, a Tesla pay package worth potentially $1 trillion for Musk was approved, which he is to receive over 10 years if he meets specific goals. Public image Although his ventures have been highly influential within their separate industries starting in the 2000s, Musk only became a public figure in the early 2010s. He has been described as an eccentric who makes spontaneous and impactful decisions, while also often making controversial statements, contrary to other billionaires who prefer reclusiveness to protect their businesses. Musk's actions and his expressed views have made him a polarizing figure. Biographer Ashlee Vance described people's opinions of Musk as polarized due to his "part philosopher, part troll" persona on Twitter. He has drawn denouncement for using his platform to mock the self-selection of personal pronouns, while also receiving praise for bringing international attention to matters like British survivors of grooming gangs. Musk has been described as an American oligarch due to his extensive influence over public discourse, social media, industry, politics, and government policy. After Trump's re-election, Musk's influence and actions during the transition period and the second presidency of Donald Trump led some to call him "President Musk", the "actual president-elect", "shadow president" or "co-president". Awards for his contributions to the development of the Falcon rockets include the American Institute of Aeronautics and Astronautics George Low Transportation Award in 2008, the Fédération Aéronautique Internationale Gold Space Medal in 2010, and the Royal Aeronautical Society Gold Medal in 2012. In 2015, he received an honorary doctorate in engineering and technology from Yale University and an Institute of Electrical and Electronics Engineers Honorary Membership. Musk was elected a Fellow of the Royal Society (FRS) in 2018.[m] In 2022, Musk was elected to the National Academy of Engineering. Time has listed Musk as one of the most influential people in the world in 2010, 2013, 2018, and 2021. Musk was selected as Time's "Person of the Year" for 2021. Then Time editor-in-chief Edward Felsenthal wrote that, "Person of the Year is a marker of influence, and few individuals have had more influence than Musk on life on Earth, and potentially life off Earth too." Notes References Works cited Further reading External links |
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[SOURCE: https://forum.webflow.com/] | [TOKENS: 327] |
Webflow Forum Connect with the community, ask questions, learn something, and help each other. Quickly search the Forum and Webflow University, or browse by category. Thank you! Your submission has been received! Oops! Something went wrong while submitting the form Forum categories Find general information about Webflow, share your work and contact our team if you're having any trouble. We're here to help! Get updates about the Webflow Community, the product, and events. Check out our getting started lesson to learn how Webflow works. Let us know if you're experiencing a bug, or need help with your Webflow account, billing or DNS configurations. Share your Webflow creations with the community. Explore this content for solutions and help with Webflow site layouts, designs, interactions & animations, dynamic content, or building out an Ecommerce experience. Explore unique community-shared layouts and ask questions about your own designs. Explore and ask questions about building unique interactions and animations in your Webflow site. Ask questions and learn about building websites with dynamic content and the Webflow CMS. Research, explore, and learn how to implement custom Ecommerce experiences. Learn how to optimize your site for search engines, work with custom code, set up automations with our API, or configure third-party integrations. Read about and get help optimizing your Webflow website for search engines. Share and ask questions about integrating custom code into your Webflow site. Ask questions about the Webflow API, and how to configure automations for Webflow sites. Share how you use any of Webflow’s hundreds of integrations, troubleshoot, and learn together. |
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[SOURCE: https://www.theverge.com/headphone-review] | [TOKENS: 1374] |
Headphone Reviews After the smartphone, headphones are the gadget we reach for most often in our daily lives. Here, The Verge tracks the best headphones for every budget and purpose, whether they be wireless, noise cancelling, in-ear, or over-ear. With all the big brands — from Bose and Beats to Sony and Sennheiser — and a few of the over-performing smaller ones, there’s a perfect pair of headphones out there for everyone, and we’ll have it covered. The best from Apple, Bose, Samsung, Sony, Beats, Google, and more. The new flagship earbuds are the best at ANC, if you can get a good seal in your ear. Latest In Headphone Reviews 7 Verge Score The Sony LinkBuds Clip are comfortable with good sound, but are light on features for the price. 8 Verge Score While the noise-canceling improvements are great, there’s not much to set them apart from the first gen. 6 Verge Score Innovative earbuds with a microphone built into the charging case. 7 Verge Score Good for side sleepers but ANC kills battery life. 9 Verge Score Everything you already liked about these earbuds just got better. 7 Verge Score Bluetooth headphones these days are computers, and Nothing’s over-the-ear headphones will always remind you of that. Better sound, better noise cancellation, and some design improvements, but a higher price. 8 Verge Score The wait was worth it thanks to a host of smart updates to sound and fit. I guess heart rate monitoring is there, too. 8 Verge Score Three-way multipoint, even better sound, and a more comfortable design make these appealing if you’re willing to splurge. SteelSeries brings its EQ audio expertise to consoles and mobile devices. 8 Verge Score The company’s latest flagship earbuds might lack originality, but they nail sound quality, transparency mode, and voice call performance. 9 Verge Score With a slew of improvements led by a far more comfortable design, Google’s latest earbuds are a compelling upgrade for Pixel owners. The AirPods 4 with active noise cancellation are worth springing for compared to the regular pair. Both sound good, but the ANC works surprisingly well — most of the time. The OpenRun Pro 2 add USB-C charging, a dedicated speaker for bass, reduced vibration, and AI noise cancellation. The bass is pretty good for open-ear fitness buds, but alas, my glasses foiled the ear hook design. Usually, I’m all about the bass for workout headphones, so I was surprised by how much I enjoyed the Suunto Sonic and Wing. 7 Verge Score The first headphones from Sonos deliver on comfort, sound, and more — with a unique TV Audio Swap feature that’s very convenient (when it works). But the ongoing app fiasco casts a cloud over the company’s big moment. 7 Verge Score Beats’ on-ear headphones get an overdue refresh with a more comfortable design, longer battery life, and wired audio over both USB-C and the 3.5mm jack — but no ANC. 7 Verge Score The Soundcore Sleep A20 are decent passive earbuds that are great for side sleepers, even if Anker overpromises. For once, I didn’t have to worry about a fiddly fit getting in the way of heart rate tracking. 8 Verge Score The company has always delivered on audio quality, but after stumbling with some bugs and hardware issues on the Momentum True Wireless 3 earbuds, Sennheiser is focusing on the little things — and it shows. 6 Verge Score With a design that clings to your outer ear, these earbuds are unlike anything the company has made before. The first wireless earbuds from Sony’s PlayStation unit have unique planar magnetic drivers and an equally unique style. 7 Verge Score These $100 earbuds offer good sound and impressive noise cancellation for the price, and they bring back the wing tip design of the Galaxy Buds Plus. 8 Verge Score With a traveler-friendly design and superb comfort, Bose’s latest flagship headphones right the course after the Noise Cancelling Headphones 700 — but they don’t come cheap. 8 Verge Score Spatial audio and voice call improvements are the main new features, but these earbuds are largely identical to last year’s QuietComfort Earbuds II otherwise. 8 Verge Score With sound quality worthy of Technics’ name and unique three-way multipoint, the EAH-AZ80 are a comprehensive package worth their $300 price. 8 Verge Score Sony’s latest flagship earbuds are excellent on multiple fronts, but the lack of an ecosystem will hold them back in the not-too-distant future. 7 Verge Score They look like a lazy refresh from the outside, but the noise-canceling Studio Pros include a ton of new features like transparency mode and lossless USB-C audio. And they solidify Beats’ unique appeal as a dual-ecosystem brand. Foam earplugs are convenient and cost virtually nothing. But with ticket prices these days, it’s worth spending a bit more on earplugs that preserve the fidelity of live music. With better sound, improved noise cancellation, and a standout translucent design, these are everything the original Beats Studio Buds should’ve been. The WF-C700N earbuds fit great, sound decent, and offer plenty of software tricks. But even within Sony’s own lineup, you might have better options. With readily available spare parts and a modular construction, Fairphone’s first over-ear headphones are a suitable companion to its repairable smartphones. I just wish they sounded better. The touchscreen offers quick access to earbud settings along with extras like timers and even a flashlight. It’s not a super compelling addition right now, but this is only the beginning of what’s sure to become a trend. The second-generation earbuds might look almost identical to the Ear 1s but with a $50 higher asking price. Lucky for Nothing, their sound quality is in a different league. Our top fitness earbuds pick from Beats now comes in more colors, but there are also great options from Sony, Jabra, Sennheiser, and more. We all get tired of Bluetooth sometimes, and the IE 200s are a nice reminder of what we’ve lost by trading the headphone jack for wireless convenience and platform-specific earbud features. Pagination Most Popular The Verge Daily A free daily digest of the news that matters most. This is the title for the native ad © 2026 Vox Media, LLC. All Rights Reserved |
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[SOURCE: https://www.wired.com/#main-content] | [TOKENS: 781] |
WIRED Today's Picks Curating... Comments and other data left on a PDF detailing Homeland Security’s proposal to build “mega” detention and processing centers reveal the personnel involved in its creation. After the US Supreme Court struck down President Donald Trump’s tariff regime, investment firms are in line for a whopping return on a niche trade. In a 6-3 ruling, justices upended the Trump administration’s signature economic policy, potentially putting the US government on the hook for at least $175 billion in tariff refunds. Reviews ICE in Focus Forum members have discussed their discomfort with mass deportation efforts, debate how federal agents have interacted with civilians, and complain about their working conditions. 2026 Winter Olympics The Olympics often provide a moment of unity and celebration during times of geopolitical uncertainty. But blind nationalism didn’t win at the 2026 Winter Games. DHS Opens a Billion-Dollar Tab With Palantir Burnt Hair and Soft Power: A Night Out With Evie Magazine Elon Musk’s X Appears to Be Violating US Sanctions by Selling Premium Accounts to Iranian Leaders A Vast Trove of Exposed Social Security Numbers May Put Millions at Risk of Identity Theft The El Paso No-Fly Debacle Is Just the Beginning of a Drone Defense Mess Ring Kills Flock Safety Deal After Super Bowl Ad Uproar A Galaxy Composed Almost Entirely of Dark Matter Has Been Confirmed Could AI Data Centers Be Moved to Outer Space? Big Tech Says Generative AI Will Save the Planet. It Doesn’t Offer Much Proof Trump Imposes New Tariffs to Sidestep Supreme Court Ruling AI Safety Meets the War Machine The War Over Prediction Markets Is Just Getting Started Meet Scotland’s Whisky-Sniffing Robot Dog Gmail Is Killing POP and Gmailify Access. Here’s What It Means for You This AI Tool Will Tell You to Stop Slacking Off This Gadget Lets You Play Game Boy Games on a Laptop—If You Have the Cartridge This Infrared Heater Hangs on Your Wall. Alas, It Heats the Wall Too The Best Mushroom Gummies, Capsules, and Wellness Supplements After the 2026 Winter Olympics, Figure Skating Will Never Be the Same The Search Engine for OnlyFans Models Who Look Like Your Crush Inside the App Where Queer Gooners Run Free The 10 Best TV Shows to Stream This Month The 24 Best Movies on Amazon Prime Right Now The 45 Best Movies on HBO Max Right Now Uncanny Valley: ICE’s Secret Expansion Plans, Palantir Workers’ Ethical Concerns, and AI Assistants Uncanny Valley: Tech Elites in the Epstein Files, Musk’s Mega Merger, and a Crypto Scam Compound Fallout Producer Jonathan Nolan on AI: ‘We’re in Such a Frothy Moment’ The Big Story Doctors, nurses, and other officers are increasingly being deployed to ICE detention centers. Some have resigned in protest, while others offer a rare look into bleak conditions. Subscriber Exclusives On TikTok, Chinese manufacturers are advertising signal-blocking weapons with the breezy cadence of consumer lifestyle advertising. Special Editions Ice hockey, curling, influencers—the 2026 Winter Olympics promise to be the most talked about Games in recent memory. WIRED has all the news you need coming out of Milan and Cortina d’Ampezzo. WIRED Classics Originally published April 2018: We leave traces of our genetic material everywhere, even on things we’ve never touched. That got Lukis Anderson charged with a brutal crime he didn’t commit. Videos © 2026 Condé Nast. All rights reserved. WIRED may earn a portion of sales from products that are purchased through our site as part of our Affiliate Partnerships with retailers. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Condé Nast. Ad Choices |
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[SOURCE: https://en.wikipedia.org/wiki/PlayStation_(console)#cite_ref-NGen36_130-0] | [TOKENS: 10728] |
Contents PlayStation (console) The PlayStation[a] (codenamed PSX, abbreviated as PS, and retroactively PS1 or PS one) is a home video game console developed and marketed by Sony Computer Entertainment. It was released in Japan on 3 December 1994, followed by North America on 9 September 1995, Europe on 29 September 1995, and other regions following thereafter. As a fifth-generation console, the PlayStation primarily competed with the Nintendo 64 and the Sega Saturn. Sony began developing the PlayStation after a failed venture with Nintendo to create a CD-ROM peripheral for the Super Nintendo Entertainment System in the early 1990s. The console was primarily designed by Ken Kutaragi and Sony Computer Entertainment in Japan, while additional development was outsourced in the United Kingdom. An emphasis on 3D polygon graphics was placed at the forefront of the console's design. PlayStation game production was designed to be streamlined and inclusive, enticing the support of many third party developers. The console proved popular for its extensive game library, popular franchises, low retail price, and aggressive youth marketing which advertised it as the preferable console for adolescents and adults. Critically acclaimed games that defined the console include Gran Turismo, Crash Bandicoot, Spyro the Dragon, Tomb Raider, Resident Evil, Metal Gear Solid, Tekken 3, and Final Fantasy VII. Sony ceased production of the PlayStation on 23 March 2006—over eleven years after it had been released, and in the same year the PlayStation 3 debuted. More than 4,000 PlayStation games were released, with cumulative sales of 962 million units. The PlayStation signaled Sony's rise to power in the video game industry. It received acclaim and sold strongly; in less than a decade, it became the first computer entertainment platform to ship over 100 million units. Its use of compact discs heralded the game industry's transition from cartridges. The PlayStation's success led to a line of successors, beginning with the PlayStation 2 in 2000. In the same year, Sony released a smaller and cheaper model, the PS one. History The PlayStation was conceived by Ken Kutaragi, a Sony executive who managed a hardware engineering division and was later dubbed "the Father of the PlayStation". Kutaragi's interest in working with video games stemmed from seeing his daughter play games on Nintendo's Famicom. Kutaragi convinced Nintendo to use his SPC-700 sound processor in the Super Nintendo Entertainment System (SNES) through a demonstration of the processor's capabilities. His willingness to work with Nintendo was derived from both his admiration of the Famicom and conviction in video game consoles becoming the main home-use entertainment systems. Although Kutaragi was nearly fired because he worked with Nintendo without Sony's knowledge, president Norio Ohga recognised the potential in Kutaragi's chip and decided to keep him as a protégé. The inception of the PlayStation dates back to a 1988 joint venture between Nintendo and Sony. Nintendo had produced floppy disk technology to complement cartridges in the form of the Family Computer Disk System, and wanted to continue this complementary storage strategy for the SNES. Since Sony was already contracted to produce the SPC-700 sound processor for the SNES, Nintendo contracted Sony to develop a CD-ROM add-on, tentatively titled the "Play Station" or "SNES-CD". The PlayStation name had already been trademarked by Yamaha, but Nobuyuki Idei liked it so much that he agreed to acquire it for an undisclosed sum rather than search for an alternative. Sony was keen to obtain a foothold in the rapidly expanding video game market. Having been the primary manufacturer of the MSX home computer format, Sony had wanted to use their experience in consumer electronics to produce their own video game hardware. Although the initial agreement between Nintendo and Sony was about producing a CD-ROM drive add-on, Sony had also planned to develop a SNES-compatible Sony-branded console. This iteration was intended to be more of a home entertainment system, playing both SNES cartridges and a new CD format named the "Super Disc", which Sony would design. Under the agreement, Sony would retain sole international rights to every Super Disc game, giving them a large degree of control despite Nintendo's leading position in the video game market. Furthermore, Sony would also be the sole benefactor of licensing related to music and film software that it had been aggressively pursuing as a secondary application. The Play Station was to be announced at the 1991 Consumer Electronics Show (CES) in Las Vegas. However, Nintendo president Hiroshi Yamauchi was wary of Sony's increasing leverage at this point and deemed the original 1988 contract unacceptable upon realising it essentially handed Sony control over all games written on the SNES CD-ROM format. Although Nintendo was dominant in the video game market, Sony possessed a superior research and development department. Wanting to protect Nintendo's existing licensing structure, Yamauchi cancelled all plans for the joint Nintendo–Sony SNES CD attachment without telling Sony. He sent Nintendo of America president Minoru Arakawa (his son-in-law) and chairman Howard Lincoln to Amsterdam to form a more favourable contract with Dutch conglomerate Philips, Sony's rival. This contract would give Nintendo total control over their licences on all Philips-produced machines. Kutaragi and Nobuyuki Idei, Sony's director of public relations at the time, learned of Nintendo's actions two days before the CES was due to begin. Kutaragi telephoned numerous contacts, including Philips, to no avail. On the first day of the CES, Sony announced their partnership with Nintendo and their new console, the Play Station. At 9 am on the next day, in what has been called "the greatest ever betrayal" in the industry, Howard Lincoln stepped onto the stage and revealed that Nintendo was now allied with Philips and would abandon their work with Sony. Incensed by Nintendo's renouncement, Ohga and Kutaragi decided that Sony would develop their own console. Nintendo's contract-breaking was met with consternation in the Japanese business community, as they had broken an "unwritten law" of native companies not turning against each other in favour of foreign ones. Sony's American branch considered allying with Sega to produce a CD-ROM-based machine called the Sega Multimedia Entertainment System, but the Sega board of directors in Tokyo vetoed the idea when Sega of America CEO Tom Kalinske presented them the proposal. Kalinske recalled them saying: "That's a stupid idea, Sony doesn't know how to make hardware. They don't know how to make software either. Why would we want to do this?" Sony halted their research, but decided to develop what it had developed with Nintendo and Sega into a console based on the SNES. Despite the tumultuous events at the 1991 CES, negotiations between Nintendo and Sony were still ongoing. A deal was proposed: the Play Station would still have a port for SNES games, on the condition that it would still use Kutaragi's audio chip and that Nintendo would own the rights and receive the bulk of the profits. Roughly two hundred prototype machines were created, and some software entered development. Many within Sony were still opposed to their involvement in the video game industry, with some resenting Kutaragi for jeopardising the company. Kutaragi remained adamant that Sony not retreat from the growing industry and that a deal with Nintendo would never work. Knowing that they had to take decisive action, Sony severed all ties with Nintendo on 4 May 1992. To determine the fate of the PlayStation project, Ohga chaired a meeting in June 1992, consisting of Kutaragi and several senior Sony board members. Kutaragi unveiled a proprietary CD-ROM-based system he had been secretly working on which played games with immersive 3D graphics. Kutaragi was confident that his LSI chip could accommodate one million logic gates, which exceeded the capabilities of Sony's semiconductor division at the time. Despite gaining Ohga's enthusiasm, there remained opposition from a majority present at the meeting. Older Sony executives also opposed it, who saw Nintendo and Sega as "toy" manufacturers. The opposers felt the game industry was too culturally offbeat and asserted that Sony should remain a central player in the audiovisual industry, where companies were familiar with one another and could conduct "civili[s]ed" business negotiations. After Kutaragi reminded him of the humiliation he suffered from Nintendo, Ohga retained the project and became one of Kutaragi's most staunch supporters. Ohga shifted Kutaragi and nine of his team from Sony's main headquarters to Sony Music Entertainment Japan (SMEJ), a subsidiary of the main Sony group, so as to retain the project and maintain relationships with Philips for the MMCD development project. The involvement of SMEJ proved crucial to the PlayStation's early development as the process of manufacturing games on CD-ROM format was similar to that used for audio CDs, with which Sony's music division had considerable experience. While at SMEJ, Kutaragi worked with Epic/Sony Records founder Shigeo Maruyama and Akira Sato; both later became vice-presidents of the division that ran the PlayStation business. Sony Computer Entertainment (SCE) was jointly established by Sony and SMEJ to handle the company's ventures into the video game industry. On 27 October 1993, Sony publicly announced that it was entering the game console market with the PlayStation. According to Maruyama, there was uncertainty over whether the console should primarily focus on 2D, sprite-based graphics or 3D polygon graphics. After Sony witnessed the success of Sega's Virtua Fighter (1993) in Japanese arcades, the direction of the PlayStation became "instantly clear" and 3D polygon graphics became the console's primary focus. SCE president Teruhisa Tokunaka expressed gratitude for Sega's timely release of Virtua Fighter as it proved "just at the right time" that making games with 3D imagery was possible. Maruyama claimed that Sony further wanted to emphasise the new console's ability to utilise redbook audio from the CD-ROM format in its games alongside high quality visuals and gameplay. Wishing to distance the project from the failed enterprise with Nintendo, Sony initially branded the PlayStation the "PlayStation X" (PSX). Sony formed their European division and North American division, known as Sony Computer Entertainment Europe (SCEE) and Sony Computer Entertainment America (SCEA), in January and May 1995. The divisions planned to market the new console under the alternative branding "PSX" following the negative feedback regarding "PlayStation" in focus group studies. Early advertising prior to the console's launch in North America referenced PSX, but the term was scrapped before launch. The console was not marketed with Sony's name in contrast to Nintendo's consoles. According to Phil Harrison, much of Sony's upper management feared that the Sony brand would be tarnished if associated with the console, which they considered a "toy". Since Sony had no experience in game development, it had to rely on the support of third-party game developers. This was in contrast to Sega and Nintendo, which had versatile and well-equipped in-house software divisions for their arcade games and could easily port successful games to their home consoles. Recent consoles like the Atari Jaguar and 3DO suffered low sales due to a lack of developer support, prompting Sony to redouble their efforts in gaining the endorsement of arcade-savvy developers. A team from Epic Sony visited more than a hundred companies throughout Japan in May 1993 in hopes of attracting game creators with the PlayStation's technological appeal. Sony found that many disliked Nintendo's practices, such as favouring their own games over others. Through a series of negotiations, Sony acquired initial support from Namco, Konami, and Williams Entertainment, as well as 250 other development teams in Japan alone. Namco in particular was interested in developing for PlayStation since Namco rivalled Sega in the arcade market. Attaining these companies secured influential games such as Ridge Racer (1993) and Mortal Kombat 3 (1995), Ridge Racer being one of the most popular arcade games at the time, and it was already confirmed behind closed doors that it would be the PlayStation's first game by December 1993, despite Namco being a longstanding Nintendo developer. Namco's research managing director Shegeichi Nakamura met with Kutaragi in 1993 to discuss the preliminary PlayStation specifications, with Namco subsequently basing the Namco System 11 arcade board on PlayStation hardware and developing Tekken to compete with Virtua Fighter. The System 11 launched in arcades several months before the PlayStation's release, with the arcade release of Tekken in September 1994. Despite securing the support of various Japanese studios, Sony had no developers of their own by the time the PlayStation was in development. This changed in 1993 when Sony acquired the Liverpudlian company Psygnosis (later renamed SCE Liverpool) for US$48 million, securing their first in-house development team. The acquisition meant that Sony could have more launch games ready for the PlayStation's release in Europe and North America. Ian Hetherington, Psygnosis' co-founder, was disappointed after receiving early builds of the PlayStation and recalled that the console "was not fit for purpose" until his team got involved with it. Hetherington frequently clashed with Sony executives over broader ideas; at one point it was suggested that a television with a built-in PlayStation be produced. In the months leading up to the PlayStation's launch, Psygnosis had around 500 full-time staff working on games and assisting with software development. The purchase of Psygnosis marked another turning point for the PlayStation as it played a vital role in creating the console's development kits. While Sony had provided MIPS R4000-based Sony NEWS workstations for PlayStation development, Psygnosis employees disliked the thought of developing on these expensive workstations and asked Bristol-based SN Systems to create an alternative PC-based development system. Andy Beveridge and Martin Day, owners of SN Systems, had previously supplied development hardware for other consoles such as the Mega Drive, Atari ST, and the SNES. When Psygnosis arranged an audience for SN Systems with Sony's Japanese executives at the January 1994 CES in Las Vegas, Beveridge and Day presented their prototype of the condensed development kit, which could run on an ordinary personal computer with two extension boards. Impressed, Sony decided to abandon their plans for a workstation-based development system in favour of SN Systems's, thus securing a cheaper and more efficient method for designing software. An order of over 600 systems followed, and SN Systems supplied Sony with additional software such as an assembler, linker, and a debugger. SN Systems produced development kits for future PlayStation systems, including the PlayStation 2 and was bought out by Sony in 2005. Sony strived to make game production as streamlined and inclusive as possible, in contrast to the relatively isolated approach of Sega and Nintendo. Phil Harrison, representative director of SCEE, believed that Sony's emphasis on developer assistance reduced most time-consuming aspects of development. As well as providing programming libraries, SCE headquarters in London, California, and Tokyo housed technical support teams that could work closely with third-party developers if needed. Sony did not favour their own over non-Sony products, unlike Nintendo; Peter Molyneux of Bullfrog Productions admired Sony's open-handed approach to software developers and lauded their decision to use PCs as a development platform, remarking that "[it was] like being released from jail in terms of the freedom you have". Another strategy that helped attract software developers was the PlayStation's use of the CD-ROM format instead of traditional cartridges. Nintendo cartridges were expensive to manufacture, and the company controlled all production, prioritising their own games, while inexpensive compact disc manufacturing occurred at dozens of locations around the world. The PlayStation's architecture and interconnectability with PCs was beneficial to many software developers. The use of the programming language C proved useful, as it safeguarded future compatibility of the machine should developers decide to make further hardware revisions. Despite the inherent flexibility, some developers found themselves restricted due to the console's lack of RAM. While working on beta builds of the PlayStation, Molyneux observed that its MIPS processor was not "quite as bullish" compared to that of a fast PC and said that it took his team two weeks to port their PC code to the PlayStation development kits and another fortnight to achieve a four-fold speed increase. An engineer from Ocean Software, one of Europe's largest game developers at the time, thought that allocating RAM was a challenging aspect given the 3.5 megabyte restriction. Kutaragi said that while it would have been easy to double the amount of RAM for the PlayStation, the development team refrained from doing so to keep the retail cost down. Kutaragi saw the biggest challenge in developing the system to be balancing the conflicting goals of high performance, low cost, and being easy to program for, and felt he and his team were successful in this regard. Its technical specifications were finalised in 1993 and its design during 1994. The PlayStation name and its final design were confirmed during a press conference on May 10, 1994, although the price and release dates had not been disclosed yet. Sony released the PlayStation in Japan on 3 December 1994, a week after the release of the Sega Saturn, at a price of ¥39,800. Sales in Japan began with a "stunning" success with long queues in shops. Ohga later recalled that he realised how important PlayStation had become for Sony when friends and relatives begged for consoles for their children. PlayStation sold 100,000 units on the first day and two million units within six months, although the Saturn outsold the PlayStation in the first few weeks due to the success of Virtua Fighter. By the end of 1994, 300,000 PlayStation units were sold in Japan compared to 500,000 Saturn units. A grey market emerged for PlayStations shipped from Japan to North America and Europe, with buyers of such consoles paying up to £700. "When September 1995 arrived and Sony's Playstation roared out of the gate, things immediately felt different than [sic] they did with the Saturn launch earlier that year. Sega dropped the Saturn $100 to match the Playstation's $299 debut price, but sales weren't even close—Playstations flew out the door as fast as we could get them in stock. Before the release in North America, Sega and Sony presented their consoles at the first Electronic Entertainment Expo (E3) in Los Angeles on 11 May 1995. At their keynote presentation, Sega of America CEO Tom Kalinske revealed that their Saturn console would be released immediately to select retailers at a price of $399. Next came Sony's turn: Olaf Olafsson, the head of SCEA, summoned Steve Race, the head of development, to the conference stage, who said "$299" and left the audience with a round of applause. The attention to the Sony conference was further bolstered by the surprise appearance of Michael Jackson and the showcase of highly anticipated games, including Wipeout (1995), Ridge Racer and Tekken (1994). In addition, Sony announced that no games would be bundled with the console. Although the Saturn had released early in the United States to gain an advantage over the PlayStation, the surprise launch upset many retailers who were not informed in time, harming sales. Some retailers such as KB Toys responded by dropping the Saturn entirely. The PlayStation went on sale in North America on 9 September 1995. It sold more units within two days than the Saturn had in five months, with almost all of the initial shipment of 100,000 units sold in advance and shops across the country running out of consoles and accessories. The well-received Ridge Racer contributed to the PlayStation's early success, — with some critics considering it superior to Sega's arcade counterpart Daytona USA (1994) — as did Battle Arena Toshinden (1995). There were over 100,000 pre-orders placed and 17 games available on the market by the time of the PlayStation's American launch, in comparison to the Saturn's six launch games. The PlayStation released in Europe on 29 September 1995 and in Australia on 15 November 1995. By November it had already outsold the Saturn by three to one in the United Kingdom, where Sony had allocated a £20 million marketing budget during the Christmas season compared to Sega's £4 million. Sony found early success in the United Kingdom by securing listings with independent shop owners as well as prominent High Street chains such as Comet and Argos. Within its first year, the PlayStation secured over 20% of the entire American video game market. From September to the end of 1995, sales in the United States amounted to 800,000 units, giving the PlayStation a commanding lead over the other fifth-generation consoles,[b] though the SNES and Mega Drive from the fourth generation still outsold it. Sony reported that the attach rate of sold games and consoles was four to one. To meet increasing demand, Sony chartered jumbo jets and ramped up production in Europe and North America. By early 1996, the PlayStation had grossed $2 billion (equivalent to $4.106 billion 2025) from worldwide hardware and software sales. By late 1996, sales in Europe totalled 2.2 million units, including 700,000 in the UK. Approximately 400 PlayStation games were in development, compared to around 200 games being developed for the Saturn and 60 for the Nintendo 64. In India, the PlayStation was launched in test market during 1999–2000 across Sony showrooms, selling 100 units. Sony finally launched the console (PS One model) countrywide on 24 January 2002 with the price of Rs 7,990 and 26 games available from start. PlayStation was also doing well in markets where it was never officially released. For example, in Brazil, due to the registration of the trademark by a third company, the console could not be released, which was why the market was taken over by the officially distributed Sega Saturn during the first period, but as the Sega console withdraws, PlayStation imports and large piracy increased. In another market, China, the most popular 32-bit console was Sega Saturn, but after leaving the market, PlayStation grown with a base of 300,000 users until January 2000, although Sony China did not have plans to release it. The PlayStation was backed by a successful marketing campaign, allowing Sony to gain an early foothold in Europe and North America. Initially, PlayStation demographics were skewed towards adults, but the audience broadened after the first price drop. While the Saturn was positioned towards 18- to 34-year-olds, the PlayStation was initially marketed exclusively towards teenagers. Executives from both Sony and Sega reasoned that because younger players typically looked up to older, more experienced players, advertising targeted at teens and adults would draw them in too. Additionally, Sony found that adults reacted best to advertising aimed at teenagers; Lee Clow surmised that people who started to grow into adulthood regressed and became "17 again" when they played video games. The console was marketed with advertising slogans stylised as "LIVE IN YUR WRLD. PLY IN URS" (Live in Your World. Play in Ours.) and "U R NOT E" (red E). The four geometric shapes were derived from the symbols for the four buttons on the controller. Clow thought that by invoking such provocative statements, gamers would respond to the contrary and say "'Bullshit. Let me show you how ready I am.'" As the console's appeal enlarged, Sony's marketing efforts broadened from their earlier focus on mature players to specifically target younger children as well. Shortly after the PlayStation's release in Europe, Sony tasked marketing manager Geoff Glendenning with assessing the desires of a new target audience. Sceptical over Nintendo and Sega's reliance on television campaigns, Glendenning theorised that young adults transitioning from fourth-generation consoles would feel neglected by marketing directed at children and teenagers. Recognising the influence early 1990s underground clubbing and rave culture had on young people, especially in the United Kingdom, Glendenning felt that the culture had become mainstream enough to help cultivate PlayStation's emerging identity. Sony partnered with prominent nightclub owners such as Ministry of Sound and festival promoters to organise dedicated PlayStation areas where demonstrations of select games could be tested. Sheffield-based graphic design studio The Designers Republic was contracted by Sony to produce promotional materials aimed at a fashionable, club-going audience. Psygnosis' Wipeout in particular became associated with nightclub culture as it was widely featured in venues. By 1997, there were 52 nightclubs in the United Kingdom with dedicated PlayStation rooms. Glendenning recalled that he had discreetly used at least £100,000 a year in slush fund money to invest in impromptu marketing. In 1996, Sony expanded their CD production facilities in the United States due to the high demand for PlayStation games, increasing their monthly output from 4 million discs to 6.5 million discs. This was necessary because PlayStation sales were running at twice the rate of Saturn sales, and its lead dramatically increased when both consoles dropped in price to $199 that year. The PlayStation also outsold the Saturn at a similar ratio in Europe during 1996, with 2.2 million consoles sold in the region by the end of the year. Sales figures for PlayStation hardware and software only increased following the launch of the Nintendo 64. Tokunaka speculated that the Nintendo 64 launch had actually helped PlayStation sales by raising public awareness of the gaming market through Nintendo's added marketing efforts. Despite this, the PlayStation took longer to achieve dominance in Japan. Tokunaka said that, even after the PlayStation and Saturn had been on the market for nearly two years, the competition between them was still "very close", and neither console had led in sales for any meaningful length of time. By 1998, Sega, encouraged by their declining market share and significant financial losses, launched the Dreamcast as a last-ditch attempt to stay in the industry. Although its launch was successful, the technically superior 128-bit console was unable to subdue Sony's dominance in the industry. Sony still held 60% of the overall video game market share in North America at the end of 1999. Sega's initial confidence in their new console was undermined when Japanese sales were lower than expected, with disgruntled Japanese consumers reportedly returning their Dreamcasts in exchange for PlayStation software. On 2 March 1999, Sony officially revealed details of the PlayStation 2, which Kutaragi announced would feature a graphics processor designed to push more raw polygons than any console in history, effectively rivalling most supercomputers. The PlayStation continued to sell strongly at the turn of the new millennium: in June 2000, Sony released the PSOne, a smaller, redesigned variant which went on to outsell all other consoles in that year, including the PlayStation 2. In 2005, PlayStation became the first console to ship 100 million units with the PlayStation 2 later achieving this faster than its predecessor. The combined successes of both PlayStation consoles led to Sega retiring the Dreamcast in 2001, and abandoning the console business entirely. The PlayStation was eventually discontinued on 23 March 2006—over eleven years after its release, and less than a year before the debut of the PlayStation 3. Hardware The main microprocessor is a R3000 CPU made by LSI Logic operating at a clock rate of 33.8688 MHz and 30 MIPS. This 32-bit CPU relies heavily on the "cop2" 3D and matrix math coprocessor on the same die to provide the necessary speed to render complex 3D graphics. The role of the separate GPU chip is to draw 2D polygons and apply shading and textures to them: the rasterisation stage of the graphics pipeline. Sony's custom 16-bit sound chip supports ADPCM sources with up to 24 sound channels and offers a sampling rate of up to 44.1 kHz and music sequencing. It features 2 MB of main RAM, with an additional 1 MB of video RAM. The PlayStation has a maximum colour depth of 16.7 million true colours with 32 levels of transparency and unlimited colour look-up tables. The PlayStation can output composite, S-Video or RGB video signals through its AV Multi connector (with older models also having RCA connectors for composite), displaying resolutions from 256×224 to 640×480 pixels. Different games can use different resolutions. Earlier models also had proprietary parallel and serial ports that could be used to connect accessories or multiple consoles together; these were later removed due to a lack of usage. The PlayStation uses a proprietary video compression unit, MDEC, which is integrated into the CPU and allows for the presentation of full motion video at a higher quality than other consoles of its generation. Unusual for the time, the PlayStation lacks a dedicated 2D graphics processor; 2D elements are instead calculated as polygons by the Geometry Transfer Engine (GTE) so that they can be processed and displayed on screen by the GPU. While running, the GPU can also generate a total of 4,000 sprites and 180,000 polygons per second, in addition to 360,000 per second flat-shaded. The PlayStation went through a number of variants during its production run. Externally, the most notable change was the gradual reduction in the number of external connectors from the rear of the unit. This started with the original Japanese launch units; the SCPH-1000, released on 3 December 1994, was the only model that had an S-Video port, as it was removed from the next model. Subsequent models saw a reduction in number of parallel ports, with the final version only retaining one serial port. Sony marketed a development kit for amateur developers known as the Net Yaroze (meaning "Let's do it together" in Japanese). It was launched in June 1996 in Japan, and following public interest, was released the next year in other countries. The Net Yaroze allowed hobbyists to create their own games and upload them via an online forum run by Sony. The console was only available to buy through an ordering service and with the necessary documentation and software to program PlayStation games and applications through C programming compilers. On 7 July 2000, Sony released the PS One (stylised as "PS one" or "PSone"), a smaller, redesigned version of the original PlayStation. It was the highest-selling console through the end of the year, outselling all other consoles—including the PlayStation 2. In 2002, Sony released a 5-inch (130 mm) LCD screen add-on for the PS One, referred to as the "Combo pack". It also included a car cigarette lighter adaptor adding an extra layer of portability. Production of the LCD "Combo Pack" ceased in 2004, when the popularity of the PlayStation began to wane in markets outside Japan. A total of 28.15 million PS One units had been sold by the time it was discontinued in March 2006. Three iterations of the PlayStation's controller were released over the console's lifespan. The first controller, the PlayStation controller, was released alongside the PlayStation in December 1994. It features four individual directional buttons (as opposed to a conventional D-pad), a pair of shoulder buttons on both sides, Start and Select buttons in the centre, and four face buttons consisting of simple geometric shapes: a green triangle, red circle, blue cross, and a pink square (, , , ). Rather than depicting traditionally used letters or numbers onto its buttons, the PlayStation controller established a trademark which would be incorporated heavily into the PlayStation brand. Teiyu Goto, the designer of the original PlayStation controller, said that the circle and cross represent "yes" and "no", respectively (though this layout is reversed in Western versions); the triangle symbolises a point of view and the square is equated to a sheet of paper to be used to access menus. The European and North American models of the original PlayStation controllers are roughly 10% larger than its Japanese variant, to account for the fact the average person in those regions has larger hands than the average Japanese person. Sony's first analogue gamepad, the PlayStation Analog Joystick (often erroneously referred to as the "Sony Flightstick"), was first released in Japan in April 1996. Featuring two parallel joysticks, it uses potentiometer technology previously used on consoles such as the Vectrex; instead of relying on binary eight-way switches, the controller detects minute angular changes through the entire range of motion. The stick also features a thumb-operated digital hat switch on the right joystick, corresponding to the traditional D-pad, and used for instances when simple digital movements were necessary. The Analog Joystick sold poorly in Japan due to its high cost and cumbersome size. The increasing popularity of 3D games prompted Sony to add analogue sticks to its controller design to give users more freedom over their movements in virtual 3D environments. The first official analogue controller, the Dual Analog Controller, was revealed to the public in a small glass booth at the 1996 PlayStation Expo in Japan, and released in April 1997 to coincide with the Japanese releases of analogue-capable games Tobal 2 and Bushido Blade. In addition to the two analogue sticks (which also introduced two new buttons mapped to clicking in the analogue sticks), the Dual Analog controller features an "Analog" button and LED beneath the "Start" and "Select" buttons which toggles analogue functionality on or off. The controller also features rumble support, though Sony decided that haptic feedback would be removed from all overseas iterations before the United States release. A Sony spokesman stated that the feature was removed for "manufacturing reasons", although rumours circulated that Nintendo had attempted to legally block the release of the controller outside Japan due to similarities with the Nintendo 64 controller's Rumble Pak. However, a Nintendo spokesman denied that Nintendo took legal action. Next Generation's Chris Charla theorised that Sony dropped vibration feedback to keep the price of the controller down. In November 1997, Sony introduced the DualShock controller. Its name derives from its use of two (dual) vibration motors (shock). Unlike its predecessor, its analogue sticks feature textured rubber grips, longer handles, slightly different shoulder buttons and has rumble feedback included as standard on all versions. The DualShock later replaced its predecessors as the default controller. Sony released a series of peripherals to add extra layers of functionality to the PlayStation. Such peripherals include memory cards, the PlayStation Mouse, the PlayStation Link Cable, the Multiplayer Adapter (a four-player multitap), the Memory Drive (a disk drive for 3.5-inch floppy disks), the GunCon (a light gun), and the Glasstron (a monoscopic head-mounted display). Released exclusively in Japan, the PocketStation is a memory card peripheral which acts as a miniature personal digital assistant. The device features a monochrome liquid crystal display (LCD), infrared communication capability, a real-time clock, built-in flash memory, and sound capability. Sharing similarities with the Dreamcast's VMU peripheral, the PocketStation was typically distributed with certain PlayStation games, enhancing them with added features. The PocketStation proved popular in Japan, selling over five million units. Sony planned to release the peripheral outside Japan but the release was cancelled, despite receiving promotion in Europe and North America. In addition to playing games, most PlayStation models are equipped to play CD-Audio. The Asian model SCPH-5903 can also play Video CDs. Like most CD players, the PlayStation can play songs in a programmed order, shuffle the playback order of the disc and repeat one song or the entire disc. Later PlayStation models use a music visualisation function called SoundScope. This function, as well as a memory card manager, is accessed by starting the console without either inserting a game or closing the CD tray, thereby accessing a graphical user interface (GUI) for the PlayStation BIOS. The GUI for the PS One and PlayStation differ depending on the firmware version: the original PlayStation GUI had a dark blue background with rainbow graffiti used as buttons, while the early PAL PlayStation and PS One GUI had a grey blocked background with two icons in the middle. PlayStation emulation is versatile and can be run on numerous modern devices. Bleem! was a commercial emulator which was released for IBM-compatible PCs and the Dreamcast in 1999. It was notable for being aggressively marketed during the PlayStation's lifetime, and was the centre of multiple controversial lawsuits filed by Sony. Bleem! was programmed in assembly language, which allowed it to emulate PlayStation games with improved visual fidelity, enhanced resolutions, and filtered textures that was not possible on original hardware. Sony sued Bleem! two days after its release, citing copyright infringement and accusing the company of engaging in unfair competition and patent infringement by allowing use of PlayStation BIOSs on a Sega console. Bleem! were subsequently forced to shut down in November 2001. Sony was aware that using CDs for game distribution could have left games vulnerable to piracy, due to the growing popularity of CD-R and optical disc drives with burning capability. To preclude illegal copying, a proprietary process for PlayStation disc manufacturing was developed that, in conjunction with an augmented optical drive in Tiger H/E assembly, prevented burned copies of games from booting on an unmodified console. Specifically, all genuine PlayStation discs were printed with a small section of deliberate irregular data, which the PlayStation's optical pick-up was capable of detecting and decoding. Consoles would not boot game discs without a specific wobble frequency contained in the data of the disc pregap sector (the same system was also used to encode discs' regional lockouts). This signal was within Red Book CD tolerances, so PlayStation discs' actual content could still be read by a conventional disc drive; however, the disc drive could not detect the wobble frequency (therefore duplicating the discs omitting it), since the laser pick-up system of any optical disc drive would interpret this wobble as an oscillation of the disc surface and compensate for it in the reading process. Early PlayStations, particularly early 1000 models, experience skipping full-motion video or physical "ticking" noises from the unit. The problems stem from poorly placed vents leading to overheating in some environments, causing the plastic mouldings inside the console to warp slightly and create knock-on effects with the laser assembly. The solution is to sit the console on a surface which dissipates heat efficiently in a well vented area or raise the unit up slightly from its resting surface. Sony representatives also recommended unplugging the PlayStation when it is not in use, as the system draws in a small amount of power (and therefore heat) even when turned off. The first batch of PlayStations use a KSM-440AAM laser unit, whose case and movable parts are all built out of plastic. Over time, the plastic lens sled rail wears out—usually unevenly—due to friction. The placement of the laser unit close to the power supply accelerates wear, due to the additional heat, which makes the plastic more vulnerable to friction. Eventually, one side of the lens sled will become so worn that the laser can tilt, no longer pointing directly at the CD; after this, games will no longer load due to data read errors. Sony fixed the problem by making the sled out of die-cast metal and placing the laser unit further away from the power supply on later PlayStation models. Due to an engineering oversight, the PlayStation does not produce a proper signal on several older models of televisions, causing the display to flicker or bounce around the screen. Sony decided not to change the console design, since only a small percentage of PlayStation owners used such televisions, and instead gave consumers the option of sending their PlayStation unit to a Sony service centre to have an official modchip installed, allowing play on older televisions. Game library The PlayStation featured a diverse game library which grew to appeal to all types of players. Critically acclaimed PlayStation games included Final Fantasy VII (1997), Crash Bandicoot (1996), Spyro the Dragon (1998), Metal Gear Solid (1998), all of which became established franchises. Final Fantasy VII is credited with allowing role-playing games to gain mass-market appeal outside Japan, and is considered one of the most influential and greatest video games ever made. The PlayStation's bestselling game is Gran Turismo (1997), which sold 10.85 million units. After the PlayStation's discontinuation in 2006, the cumulative software shipment was 962 million units. Following its 1994 launch in Japan, early games included Ridge Racer, Crime Crackers, King's Field, Motor Toon Grand Prix, Toh Shin Den (i.e. Battle Arena Toshinden), and Kileak: The Blood. The first two games available at its later North American launch were Jumping Flash! (1995) and Ridge Racer, with Jumping Flash! heralded as an ancestor for 3D graphics in console gaming. Wipeout, Air Combat, Twisted Metal, Warhawk and Destruction Derby were among the popular first-year games, and the first to be reissued as part of Sony's Greatest Hits or Platinum range. At the time of the PlayStation's first Christmas season, Psygnosis had produced around 70% of its launch catalogue; their breakthrough racing game Wipeout was acclaimed for its techno soundtrack and helped raise awareness of Britain's underground music community. Eidos Interactive's action-adventure game Tomb Raider contributed substantially to the success of the console in 1996, with its main protagonist Lara Croft becoming an early gaming icon and garnering unprecedented media promotion. Licensed tie-in video games of popular films were also prevalent; Argonaut Games' 2001 adaptation of Harry Potter and the Philosopher's Stone went on to sell over eight million copies late in the console's lifespan. Third-party developers committed largely to the console's wide-ranging game catalogue even after the launch of the PlayStation 2; some of the notable exclusives in this era include Harry Potter and the Philosopher's Stone, Fear Effect 2: Retro Helix, Syphon Filter 3, C-12: Final Resistance, Dance Dance Revolution Konamix and Digimon World 3.[c] Sony assisted with game reprints as late as 2008 with Metal Gear Solid: The Essential Collection, this being the last PlayStation game officially released and licensed by Sony. Initially, in the United States, PlayStation games were packaged in long cardboard boxes, similar to non-Japanese 3DO and Saturn games. Sony later switched to the jewel case format typically used for audio CDs and Japanese video games, as this format took up less retailer shelf space (which was at a premium due to the large number of PlayStation games being released), and focus testing showed that most consumers preferred this format. Reception The PlayStation was mostly well received upon release. Critics in the west generally welcomed the new console; the staff of Next Generation reviewed the PlayStation a few weeks after its North American launch, where they commented that, while the CPU is "fairly average", the supplementary custom hardware, such as the GPU and sound processor, is stunningly powerful. They praised the PlayStation's focus on 3D, and complemented the comfort of its controller and the convenience of its memory cards. Giving the system 41⁄2 out of 5 stars, they concluded, "To succeed in this extremely cut-throat market, you need a combination of great hardware, great games, and great marketing. Whether by skill, luck, or just deep pockets, Sony has scored three out of three in the first salvo of this war." Albert Kim from Entertainment Weekly praised the PlayStation as a technological marvel, rivalling that of Sega and Nintendo. Famicom Tsūshin scored the console a 19 out of 40, lower than the Saturn's 24 out of 40, in May 1995. In a 1997 year-end review, a team of five Electronic Gaming Monthly editors gave the PlayStation scores of 9.5, 8.5, 9.0, 9.0, and 9.5—for all five editors, the highest score they gave to any of the five consoles reviewed in the issue. They lauded the breadth and quality of the games library, saying it had vastly improved over previous years due to developers mastering the system's capabilities in addition to Sony revising their stance on 2D and role playing games. They also complimented the low price point of the games compared to the Nintendo 64's, and noted that it was the only console on the market that could be relied upon to deliver a solid stream of games for the coming year, primarily due to third party developers almost unanimously favouring it over its competitors. Legacy SCE was an upstart in the video game industry in late 1994, as the video game market in the early 1990s was dominated by Nintendo and Sega. Nintendo had been the clear leader in the industry since the introduction of the Nintendo Entertainment System in 1985 and the Nintendo 64 was initially expected to maintain this position. The PlayStation's target audience included the generation which was the first to grow up with mainstream video games, along with 18- to 29-year-olds who were not the primary focus of Nintendo. By the late 1990s, Sony became a highly regarded console brand due to the PlayStation, with a significant lead over second-place Nintendo, while Sega was relegated to a distant third. The PlayStation became the first "computer entertainment platform" to ship over 100 million units worldwide, with many critics attributing the console's success to third-party developers. It remains the sixth best-selling console of all time as of 2025[update], with a total of 102.49 million units sold. Around 7,900 individual games were published for the console during its 11-year life span, the second-most games ever produced for a console. Its success resulted in a significant financial boon for Sony as profits from their video game division contributed to 23%. Sony's next-generation PlayStation 2, which is backward compatible with the PlayStation's DualShock controller and games, was announced in 1999 and launched in 2000. The PlayStation's lead in installed base and developer support paved the way for the success of its successor, which overcame the earlier launch of the Sega's Dreamcast and then fended off competition from Microsoft's newcomer Xbox and Nintendo's GameCube. The PlayStation 2's immense success and failure of the Dreamcast were among the main factors which led to Sega abandoning the console market. To date, five PlayStation home consoles have been released, which have continued the same numbering scheme, as well as two portable systems. The PlayStation 3 also maintained backward compatibility with original PlayStation discs. Hundreds of PlayStation games have been digitally re-released on the PlayStation Portable, PlayStation 3, PlayStation Vita, PlayStation 4, and PlayStation 5. The PlayStation has often ranked among the best video game consoles. In 2018, Retro Gamer named it the third best console, crediting its sophisticated 3D capabilities as one of its key factors in gaining mass success, and lauding it as a "game-changer in every sense possible". In 2009, IGN ranked the PlayStation the seventh best console in their list, noting its appeal towards older audiences to be a crucial factor in propelling the video game industry, as well as its assistance in transitioning game industry to use the CD-ROM format. Keith Stuart from The Guardian likewise named it as the seventh best console in 2020, declaring that its success was so profound it "ruled the 1990s". In January 2025, Lorentio Brodesco announced the nsOne project, attempting to reverse engineer PlayStation's motherboard. Brodesco stated that "detailed documentation on the original motherboard was either incomplete or entirely unavailable". The project was successfully crowdfunded via Kickstarter. In June, Brodesco manufactured the first working motherboard, promising to bring a fully rooted version with multilayer routing as well as documentation and design files in the near future. The success of the PlayStation contributed to the demise of cartridge-based home consoles. While not the first system to use an optical disc format, it was the first highly successful one, and ended up going head-to-head with the proprietary cartridge-relying Nintendo 64,[d] which the industry had expected to use CDs like PlayStation. After the demise of the Sega Saturn, Nintendo was left as Sony's main competitor in Western markets. Nintendo chose not to use CDs for the Nintendo 64; they were likely concerned with the proprietary cartridge format's ability to help enforce copy protection, given their substantial reliance on licensing and exclusive games for their revenue. Besides their larger capacity, CD-ROMs could be produced in bulk quantities at a much faster rate than ROM cartridges, a week compared to two to three months. Further, the cost of production per unit was far cheaper, allowing Sony to offer games about 40% lower cost to the user compared to ROM cartridges while still making the same amount of net revenue. In Japan, Sony published fewer copies of a wide variety of games for the PlayStation as a risk-limiting step, a model that had been used by Sony Music for CD audio discs. The production flexibility of CD-ROMs meant that Sony could produce larger volumes of popular games to get onto the market quickly, something that could not be done with cartridges due to their manufacturing lead time. The lower production costs of CD-ROMs also allowed publishers an additional source of profit: budget-priced reissues of games which had already recouped their development costs. Tokunaka remarked in 1996: Choosing CD-ROM is one of the most important decisions that we made. As I'm sure you understand, PlayStation could just as easily have worked with masked ROM [cartridges]. The 3D engine and everything—the whole PlayStation format—is independent of the media. But for various reasons (including the economies for the consumer, the ease of the manufacturing, inventory control for the trade, and also the software publishers) we deduced that CD-ROM would be the best media for PlayStation. The increasing complexity of developing games pushed cartridges to their storage limits and gradually discouraged some third-party developers. Part of the CD format's appeal to publishers was that they could be produced at a significantly lower cost and offered more production flexibility to meet demand. As a result, some third-party developers switched to the PlayStation, including Square and Enix, whose Final Fantasy VII and Dragon Quest VII respectively had been planned for the Nintendo 64 (both companies later merged to form Square Enix). Other developers released fewer games for the Nintendo 64 (Konami, releasing only thirteen N64 games but over fifty on the PlayStation). Nintendo 64 game releases were less frequent than the PlayStation's, with many being developed by either Nintendo themselves or second-parties such as Rare. The PlayStation Classic is a dedicated video game console made by Sony Interactive Entertainment that emulates PlayStation games. It was announced in September 2018 at the Tokyo Game Show, and released on 3 December 2018, the 24th anniversary of the release of the original console. As a dedicated console, the PlayStation Classic features 20 pre-installed games; the games run off the open source emulator PCSX. The console is bundled with two replica wired PlayStation controllers (those without analogue sticks), an HDMI cable, and a USB-Type A cable. Internally, the console uses a MediaTek MT8167a Quad A35 system on a chip with four central processing cores clocked at @ 1.5 GHz and a Power VR GE8300 graphics processing unit. It includes 16 GB of eMMC flash storage and 1 Gigabyte of DDR3 SDRAM. The PlayStation Classic is 45% smaller than the original console. The PlayStation Classic received negative reviews from critics and was compared unfavorably to Nintendo's rival Nintendo Entertainment System Classic Edition and Super Nintendo Entertainment System Classic Edition. Criticism was directed at its meagre game library, user interface, emulation quality, use of PAL versions for certain games, use of the original controller, and high retail price, though the console's design received praise. The console sold poorly. See also Notes References |
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[SOURCE: https://en.wikipedia.org/wiki/Mars#cite_ref-ag44_4_42-0] | [TOKENS: 11899] |
Contents Mars Mars is the fourth planet from the Sun. It is also known as the "Red Planet", for its orange-red appearance. Mars is a desert-like rocky planet with a tenuous atmosphere that is primarily carbon dioxide (CO2). At the average surface level the atmospheric pressure is a few thousandths of Earth's, atmospheric temperature ranges from −153 to 20 °C (−243 to 68 °F), and cosmic radiation is high. Mars retains some water, in the ground as well as thinly in the atmosphere, forming cirrus clouds, fog, frost, larger polar regions of permafrost and ice caps (with seasonal CO2 snow), but no bodies of liquid surface water. Its surface gravity is roughly a third of Earth's or double that of the Moon. Its diameter, 6,779 km (4,212 mi), is about half the Earth's, or twice the Moon's, and its surface area is the size of all the dry land of Earth. Fine dust is prevalent across the surface and the atmosphere, being picked up and spread at the low Martian gravity even by the weak wind of the tenuous atmosphere. The terrain of Mars roughly follows a north-south divide, the Martian dichotomy, with the northern hemisphere mainly consisting of relatively flat, low lying plains, and the southern hemisphere of cratered highlands. Geologically, the planet is fairly active with marsquakes trembling underneath the ground, but also hosts many enormous volcanoes that are extinct (the tallest is Olympus Mons, 21.9 km or 13.6 mi tall), as well as one of the largest canyons in the Solar System (Valles Marineris, 4,000 km or 2,500 mi long). Mars has two natural satellites that are small and irregular in shape: Phobos and Deimos. With a significant axial tilt of 25 degrees, Mars experiences seasons, like Earth (which has an axial tilt of 23.5 degrees). A Martian solar year is equal to 1.88 Earth years (687 Earth days), a Martian solar day (sol) is equal to 24.6 hours. Mars formed along with the other planets approximately 4.5 billion years ago. During the martian Noachian period (4.5 to 3.5 billion years ago), its surface was marked by meteor impacts, valley formation, erosion, the possible presence of water oceans and the loss of its magnetosphere. The Hesperian period (beginning 3.5 billion years ago and ending 3.3–2.9 billion years ago) was dominated by widespread volcanic activity and flooding that carved immense outflow channels. The Amazonian period, which continues to the present, is the currently dominating and remaining influence on geological processes. Because of Mars's geological history, the possibility of past or present life on Mars remains an area of active scientific investigation, with some possible traces needing further examination. Being visible with the naked eye in Earth's sky as a red wandering star, Mars has been observed throughout history, acquiring diverse associations in different cultures. In 1963 the first flight to Mars took place with Mars 1, but communication was lost en route. The first successful flyby exploration of Mars was conducted in 1965 with Mariner 4. In 1971 Mariner 9 entered orbit around Mars, being the first spacecraft to orbit any body other than the Moon, Sun or Earth; following in the same year were the first uncontrolled impact (Mars 2) and first successful landing (Mars 3) on Mars. Probes have been active on Mars continuously since 1997. At times, more than ten probes have simultaneously operated in orbit or on the surface, more than at any other planet beyond Earth. Mars is an often proposed target for future crewed exploration missions, though no such mission is currently planned. Natural history Scientists have theorized that during the Solar System's formation, Mars was created as the result of a random process of run-away accretion of material from the protoplanetary disk that orbited the Sun. Mars has many distinctive chemical features caused by its position in the Solar System. Elements with comparatively low boiling points, such as chlorine, phosphorus, and sulfur, are much more common on Mars than on Earth; these elements were probably pushed outward by the young Sun's energetic solar wind. After the formation of the planets, the inner Solar System may have been subjected to the so-called Late Heavy Bombardment. About 60% of the surface of Mars shows a record of impacts from that era, whereas much of the remaining surface is probably underlain by immense impact basins caused by those events. However, more recent modeling has disputed the existence of the Late Heavy Bombardment. There is evidence of an enormous impact basin in the Northern Hemisphere of Mars, spanning 10,600 by 8,500 kilometres (6,600 by 5,300 mi), or roughly four times the size of the Moon's South Pole–Aitken basin, which would be the largest impact basin yet discovered if confirmed. It has been hypothesized that the basin was formed when Mars was struck by a Pluto-sized body about four billion years ago. The event, thought to be the cause of the Martian hemispheric dichotomy, created the smooth Borealis basin that covers 40% of the planet. A 2023 study shows evidence, based on the orbital inclination of Deimos (a small moon of Mars), that Mars may once have had a ring system 3.5 billion years to 4 billion years ago. This ring system may have been formed from a moon, 20 times more massive than Phobos, orbiting Mars billions of years ago; and Phobos would be a remnant of that ring. Epochs: The geological history of Mars can be split into many periods, but the following are the three primary periods: Geological activity is still taking place on Mars. The Athabasca Valles is home to sheet-like lava flows created about 200 million years ago. Water flows in the grabens called the Cerberus Fossae occurred less than 20 million years ago, indicating equally recent volcanic intrusions. The Mars Reconnaissance Orbiter has captured images of avalanches. Physical characteristics Mars is approximately half the diameter of Earth or twice that of the Moon, with a surface area only slightly less than the total area of Earth's dry land. Mars is less dense than Earth, having about 15% of Earth's volume and 11% of Earth's mass, resulting in about 38% of Earth's surface gravity. Mars is the only presently known example of a desert planet, a rocky planet with a surface akin to that of Earth's deserts. The red-orange appearance of the Martian surface is caused by iron(III) oxide (nanophase Fe2O3) and the iron(III) oxide-hydroxide mineral goethite. It can look like butterscotch; other common surface colors include golden, brown, tan, and greenish, depending on the minerals present. Like Earth, Mars is differentiated into a dense metallic core overlaid by less dense rocky layers. The outermost layer is the crust, which is on average about 42–56 kilometres (26–35 mi) thick, with a minimum thickness of 6 kilometres (3.7 mi) in Isidis Planitia, and a maximum thickness of 117 kilometres (73 mi) in the southern Tharsis plateau. For comparison, Earth's crust averages 27.3 ± 4.8 km in thickness. The most abundant elements in the Martian crust are silicon, oxygen, iron, magnesium, aluminum, calcium, and potassium. Mars is confirmed to be seismically active; in 2019, it was reported that InSight had detected and recorded over 450 marsquakes and related events. Beneath the crust is a silicate mantle responsible for many of the tectonic and volcanic features on the planet's surface. The upper Martian mantle is a low-velocity zone, where the velocity of seismic waves is lower than surrounding depth intervals. The mantle appears to be rigid down to the depth of about 250 km, giving Mars a very thick lithosphere compared to Earth. Below this the mantle gradually becomes more ductile, and the seismic wave velocity starts to grow again. The Martian mantle does not appear to have a thermally insulating layer analogous to Earth's lower mantle; instead, below 1050 km in depth, it becomes mineralogically similar to Earth's transition zone. At the bottom of the mantle lies a basal liquid silicate layer approximately 150–180 km thick. The Martian mantle appears to be highly heterogenous, with dense fragments up to 4 km across, likely injected deep into the planet by colossal impacts ~4.5 billion years ago; high-frequency waves from eight marsquakes slowed as they passed these localized regions, and modeling indicates the heterogeneities are compositionally distinct debris preserved because Mars lacks plate tectonics and has a sluggishly convecting interior that prevents complete homogenization. Mars's iron and nickel core is at least partially molten, and may have a solid inner core. It is around half of Mars's radius, approximately 1650–1675 km, and is enriched in light elements such as sulfur, oxygen, carbon, and hydrogen. The temperature of the core is estimated to be 2000–2400 K, compared to 5400–6230 K for Earth's solid inner core. In 2025, based on data from the InSight lander, a group of researchers reported the detection of a solid inner core 613 kilometres (381 mi) ± 67 kilometres (42 mi) in radius. Mars is a terrestrial planet with a surface that consists of minerals containing silicon and oxygen, metals, and other elements that typically make up rock. The Martian surface is primarily composed of tholeiitic basalt, although parts are more silica-rich than typical basalt and may be similar to andesitic rocks on Earth, or silica glass. Regions of low albedo suggest concentrations of plagioclase feldspar, with northern low albedo regions displaying higher than normal concentrations of sheet silicates and high-silicon glass. Parts of the southern highlands include detectable amounts of high-calcium pyroxenes. Localized concentrations of hematite and olivine have been found. Much of the surface is deeply covered by finely grained iron(III) oxide dust. The Phoenix lander returned data showing Martian soil to be slightly alkaline and containing elements such as magnesium, sodium, potassium and chlorine. These nutrients are found in soils on Earth, and are necessary for plant growth. Experiments performed by the lander showed that the Martian soil has a basic pH of 7.7, and contains 0.6% perchlorate by weight, concentrations that are toxic to humans. Streaks are common across Mars and new ones appear frequently on steep slopes of craters, troughs, and valleys. The streaks are dark at first and get lighter with age. The streaks can start in a tiny area, then spread out for hundreds of metres. They have been seen to follow the edges of boulders and other obstacles in their path. The commonly accepted hypotheses include that they are dark underlying layers of soil revealed after avalanches of bright dust or dust devils. Several other explanations have been put forward, including those that involve water or even the growth of organisms. Environmental radiation levels on the surface are on average 0.64 millisieverts of radiation per day, and significantly less than the radiation of 1.84 millisieverts per day or 22 millirads per day during the flight to and from Mars. For comparison the radiation levels in low Earth orbit, where Earth's space stations orbit, are around 0.5 millisieverts of radiation per day. Hellas Planitia has the lowest surface radiation at about 0.342 millisieverts per day, featuring lava tubes southwest of Hadriacus Mons with potentially levels as low as 0.064 millisieverts per day, comparable to radiation levels during flights on Earth. Although Mars has no evidence of a structured global magnetic field, observations show that parts of the planet's crust have been magnetized, suggesting that alternating polarity reversals of its dipole field have occurred in the past. This paleomagnetism of magnetically susceptible minerals is similar to the alternating bands found on Earth's ocean floors. One hypothesis, published in 1999 and re-examined in October 2005 (with the help of the Mars Global Surveyor), is that these bands suggest plate tectonic activity on Mars four billion years ago, before the planetary dynamo ceased to function and the planet's magnetic field faded. Geography and features Although better remembered for mapping the Moon, Johann Heinrich von Mädler and Wilhelm Beer were the first areographers. They began by establishing that most of Mars's surface features were permanent and by more precisely determining the planet's rotation period. In 1840, Mädler combined ten years of observations and drew the first map of Mars. Features on Mars are named from a variety of sources. Albedo features are named for classical mythology. Craters larger than roughly 50 km are named for deceased scientists and writers and others who have contributed to the study of Mars. Smaller craters are named for towns and villages of the world with populations of less than 100,000. Large valleys are named for the word "Mars" or "star" in various languages; smaller valleys are named for rivers. Large albedo features retain many of the older names but are often updated to reflect new knowledge of the nature of the features. For example, Nix Olympica (the snows of Olympus) has become Olympus Mons (Mount Olympus). The surface of Mars as seen from Earth is divided into two kinds of areas, with differing albedo. The paler plains covered with dust and sand rich in reddish iron oxides were once thought of as Martian "continents" and given names like Arabia Terra (land of Arabia) or Amazonis Planitia (Amazonian plain). The dark features were thought to be seas, hence their names Mare Erythraeum, Mare Sirenum and Aurorae Sinus. The largest dark feature seen from Earth is Syrtis Major Planum. The permanent northern polar ice cap is named Planum Boreum. The southern cap is called Planum Australe. Mars's equator is defined by its rotation, but the location of its Prime Meridian was specified, as was Earth's (at Greenwich), by choice of an arbitrary point; Mädler and Beer selected a line for their first maps of Mars in 1830. After the spacecraft Mariner 9 provided extensive imagery of Mars in 1972, a small crater (later called Airy-0), located in the Sinus Meridiani ("Middle Bay" or "Meridian Bay"), was chosen by Merton E. Davies, Harold Masursky, and Gérard de Vaucouleurs for the definition of 0.0° longitude to coincide with the original selection. Because Mars has no oceans, and hence no "sea level", a zero-elevation surface had to be selected as a reference level; this is called the areoid of Mars, analogous to the terrestrial geoid. Zero altitude was defined by the height at which there is 610.5 Pa (6.105 mbar) of atmospheric pressure. This pressure corresponds to the triple point of water, and it is about 0.6% of the sea level surface pressure on Earth (0.006 atm). For mapping purposes, the United States Geological Survey divides the surface of Mars into thirty cartographic quadrangles, each named for a classical albedo feature it contains. In April 2023, The New York Times reported an updated global map of Mars based on images from the Hope spacecraft. A related, but much more detailed, global Mars map was released by NASA on 16 April 2023. The vast upland region Tharsis contains several massive volcanoes, which include the shield volcano Olympus Mons. The edifice is over 600 km (370 mi) wide. Because the mountain is so large, with complex structure at its edges, giving a definite height to it is difficult. Its local relief, from the foot of the cliffs which form its northwest margin to its peak, is over 21 km (13 mi), a little over twice the height of Mauna Kea as measured from its base on the ocean floor. The total elevation change from the plains of Amazonis Planitia, over 1,000 km (620 mi) to the northwest, to the summit approaches 26 km (16 mi), roughly three times the height of Mount Everest, which in comparison stands at just over 8.8 kilometres (5.5 mi). Consequently, Olympus Mons is either the tallest or second-tallest mountain in the Solar System; the only known mountain which might be taller is the Rheasilvia peak on the asteroid Vesta, at 20–25 km (12–16 mi). The dichotomy of Martian topography is striking: northern plains flattened by lava flows contrast with the southern highlands, pitted and cratered by ancient impacts. It is possible that, four billion years ago, the Northern Hemisphere of Mars was struck by an object one-tenth to two-thirds the size of Earth's Moon. If this is the case, the Northern Hemisphere of Mars would be the site of an impact crater 10,600 by 8,500 kilometres (6,600 by 5,300 mi) in size, or roughly the area of Europe, Asia, and Australia combined, surpassing Utopia Planitia and the Moon's South Pole–Aitken basin as the largest impact crater in the Solar System. Mars is scarred by 43,000 impact craters with a diameter of 5 kilometres (3.1 mi) or greater. The largest exposed crater is Hellas, which is 2,300 kilometres (1,400 mi) wide and 7,000 metres (23,000 ft) deep, and is a light albedo feature clearly visible from Earth. There are other notable impact features, such as Argyre, which is around 1,800 kilometres (1,100 mi) in diameter, and Isidis, which is around 1,500 kilometres (930 mi) in diameter. Due to the smaller mass and size of Mars, the probability of an object colliding with the planet is about half that of Earth. Mars is located closer to the asteroid belt, so it has an increased chance of being struck by materials from that source. Mars is more likely to be struck by short-period comets, i.e., those that lie within the orbit of Jupiter. Martian craters can[discuss] have a morphology that suggests the ground became wet after the meteor impact. The large canyon, Valles Marineris (Latin for 'Mariner Valleys, also known as Agathodaemon in the old canal maps), has a length of 4,000 kilometres (2,500 mi) and a depth of up to 7 kilometres (4.3 mi). The length of Valles Marineris is equivalent to the length of Europe and extends across one-fifth the circumference of Mars. By comparison, the Grand Canyon on Earth is only 446 kilometres (277 mi) long and nearly 2 kilometres (1.2 mi) deep. Valles Marineris was formed due to the swelling of the Tharsis area, which caused the crust in the area of Valles Marineris to collapse. In 2012, it was proposed that Valles Marineris is not just a graben, but a plate boundary where 150 kilometres (93 mi) of transverse motion has occurred, making Mars a planet with possibly a two-tectonic plate arrangement. Images from the Thermal Emission Imaging System (THEMIS) aboard NASA's Mars Odyssey orbiter have revealed seven possible cave entrances on the flanks of the volcano Arsia Mons. The caves, named after loved ones of their discoverers, are collectively known as the "seven sisters". Cave entrances measure from 100 to 252 metres (328 to 827 ft) wide and they are estimated to be at least 73 to 96 metres (240 to 315 ft) deep. Because light does not reach the floor of most of the caves, they may extend much deeper than these lower estimates and widen below the surface. "Dena" is the only exception; its floor is visible and was measured to be 130 metres (430 ft) deep. The interiors of these caverns may be protected from micrometeoroids, UV radiation, solar flares and high energy particles that bombard the planet's surface. Martian geysers (or CO2 jets) are putative sites of small gas and dust eruptions that occur in the south polar region of Mars during the spring thaw. "Dark dune spots" and "spiders" – or araneiforms – are the two most visible types of features ascribed to these eruptions. Similarly sized dust will settle from the thinner Martian atmosphere sooner than it would on Earth. For example, the dust suspended by the 2001 global dust storms on Mars only remained in the Martian atmosphere for 0.6 years, while the dust from Mount Pinatubo took about two years to settle. However, under current Martian conditions, the mass movements involved are generally much smaller than on Earth. Even the 2001 global dust storms on Mars moved only the equivalent of a very thin dust layer – about 3 μm thick if deposited with uniform thickness between 58° north and south of the equator. Dust deposition at the two rover sites has proceeded at a rate of about the thickness of a grain every 100 sols. Atmosphere Mars lost its magnetosphere 4 billion years ago, possibly because of numerous asteroid strikes, so the solar wind interacts directly with the Martian ionosphere, lowering the atmospheric density by stripping away atoms from the outer layer. Both Mars Global Surveyor and Mars Express have detected ionized atmospheric particles trailing off into space behind Mars, and this atmospheric loss is being studied by the MAVEN orbiter. Compared to Earth, the atmosphere of Mars is quite rarefied. Atmospheric pressure on the surface today ranges from a low of 30 Pa (0.0044 psi) on Olympus Mons to over 1,155 Pa (0.1675 psi) in Hellas Planitia, with a mean pressure at the surface level of 600 Pa (0.087 psi). The highest atmospheric density on Mars is equal to that found 35 kilometres (22 mi) above Earth's surface. The resulting mean surface pressure is only 0.6% of Earth's 101.3 kPa (14.69 psi). The scale height of the atmosphere is about 10.8 kilometres (6.7 mi), which is higher than Earth's 6 kilometres (3.7 mi), because the surface gravity of Mars is only about 38% of Earth's. The atmosphere of Mars consists of about 96% carbon dioxide, 1.93% argon and 1.89% nitrogen along with traces of oxygen and water. The atmosphere is quite dusty, containing particulates about 1.5 μm in diameter which give the Martian sky a tawny color when seen from the surface. It may take on a pink hue due to iron oxide particles suspended in it. Despite repeated detections of methane on Mars, there is no scientific consensus as to its origin. One suggestion is that methane exists on Mars and that its concentration fluctuates seasonally. The existence of methane could be produced by non-biological process such as serpentinization involving water, carbon dioxide, and the mineral olivine, which is known to be common on Mars, or by Martian life. Compared to Earth, its higher concentration of atmospheric CO2 and lower surface pressure may be why sound is attenuated more on Mars, where natural sources are rare apart from the wind. Using acoustic recordings collected by the Perseverance rover, researchers concluded that the speed of sound there is approximately 240 m/s for frequencies below 240 Hz, and 250 m/s for those above. Auroras have been detected on Mars. Because Mars lacks a global magnetic field, the types and distribution of auroras there differ from those on Earth; rather than being mostly restricted to polar regions as is the case on Earth, a Martian aurora can encompass the planet. In September 2017, NASA reported radiation levels on the surface of the planet Mars were temporarily doubled, and were associated with an aurora 25 times brighter than any observed earlier, due to a massive, and unexpected, solar storm in the middle of the month. Mars has seasons, alternating between its northern and southern hemispheres, similar to on Earth. Additionally the orbit of Mars has, compared to Earth's, a large eccentricity and approaches perihelion when it is summer in its southern hemisphere and winter in its northern, and aphelion when it is winter in its southern hemisphere and summer in its northern. As a result, the seasons in its southern hemisphere are more extreme and the seasons in its northern are milder than would otherwise be the case. The summer temperatures in the south can be warmer than the equivalent summer temperatures in the north by up to 30 °C (54 °F). Martian surface temperatures vary from lows of about −110 °C (−166 °F) to highs of up to 35 °C (95 °F) in equatorial summer. The wide range in temperatures is due to the thin atmosphere which cannot store much solar heat, the low atmospheric pressure (about 1% that of the atmosphere of Earth), and the low thermal inertia of Martian soil. The planet is 1.52 times as far from the Sun as Earth, resulting in just 43% of the amount of sunlight. Mars has the largest dust storms in the Solar System, reaching speeds of over 160 km/h (100 mph). These can vary from a storm over a small area, to gigantic storms that cover the entire planet. They tend to occur when Mars is closest to the Sun, and have been shown to increase global temperature. Seasons also produce dry ice covering polar ice caps. Hydrology While Mars contains water in larger amounts, most of it is dust covered water ice at the Martian polar ice caps. The volume of water ice in the south polar ice cap, if melted, would be enough to cover most of the surface of the planet with a depth of 11 metres (36 ft). Water in its liquid form cannot persist on the surface due to Mars's low atmospheric pressure, which is less than 1% that of Earth. Only at the lowest of elevations are the pressure and temperature high enough for liquid water to exist for short periods. Although little water is present in the atmosphere, there is enough to produce clouds of water ice and different cases of snow and frost, often mixed with snow of carbon dioxide dry ice. Landforms visible on Mars strongly suggest that liquid water has existed on the planet's surface. Huge linear swathes of scoured ground, known as outflow channels, cut across the surface in about 25 places. These are thought to be a record of erosion caused by the catastrophic release of water from subsurface aquifers, though some of these structures have been hypothesized to result from the action of glaciers or lava. One of the larger examples, Ma'adim Vallis, is 700 kilometres (430 mi) long, much greater than the Grand Canyon, with a width of 20 kilometres (12 mi) and a depth of 2 kilometres (1.2 mi) in places. It is thought to have been carved by flowing water early in Mars's history. The youngest of these channels is thought to have formed only a few million years ago. Elsewhere, particularly on the oldest areas of the Martian surface, finer-scale, dendritic networks of valleys are spread across significant proportions of the landscape. Features of these valleys and their distribution strongly imply that they were carved by runoff resulting from precipitation in early Mars history. Subsurface water flow and groundwater sapping may play important subsidiary roles in some networks, but precipitation was probably the root cause of the incision in almost all cases. Along craters and canyon walls, there are thousands of features that appear similar to terrestrial gullies. The gullies tend to be in the highlands of the Southern Hemisphere and face the Equator; all are poleward of 30° latitude. A number of authors have suggested that their formation process involves liquid water, probably from melting ice, although others have argued for formation mechanisms involving carbon dioxide frost or the movement of dry dust. No partially degraded gullies have formed by weathering and no superimposed impact craters have been observed, indicating that these are young features, possibly still active. Other geological features, such as deltas and alluvial fans preserved in craters, are further evidence for warmer, wetter conditions at an interval or intervals in earlier Mars history. Such conditions necessarily require the widespread presence of crater lakes across a large proportion of the surface, for which there is independent mineralogical, sedimentological and geomorphological evidence. Further evidence that liquid water once existed on the surface of Mars comes from the detection of specific minerals such as hematite and goethite, both of which sometimes form in the presence of water. The chemical signature of water vapor on Mars was first unequivocally demonstrated in 1963 by spectroscopy using an Earth-based telescope. In 2004, Opportunity detected the mineral jarosite. This forms only in the presence of acidic water, showing that water once existed on Mars. The Spirit rover found concentrated deposits of silica in 2007 that indicated wet conditions in the past, and in December 2011, the mineral gypsum, which also forms in the presence of water, was found on the surface by NASA's Mars rover Opportunity. It is estimated that the amount of water in the upper mantle of Mars, represented by hydroxyl ions contained within Martian minerals, is equal to or greater than that of Earth at 50–300 parts per million of water, which is enough to cover the entire planet to a depth of 200–1,000 metres (660–3,280 ft). On 18 March 2013, NASA reported evidence from instruments on the Curiosity rover of mineral hydration, likely hydrated calcium sulfate, in several rock samples including the broken fragments of "Tintina" rock and "Sutton Inlier" rock as well as in veins and nodules in other rocks like "Knorr" rock and "Wernicke" rock. Analysis using the rover's DAN instrument provided evidence of subsurface water, amounting to as much as 4% water content, down to a depth of 60 centimetres (24 in), during the rover's traverse from the Bradbury Landing site to the Yellowknife Bay area in the Glenelg terrain. In September 2015, NASA announced that they had found strong evidence of hydrated brine flows in recurring slope lineae, based on spectrometer readings of the darkened areas of slopes. These streaks flow downhill in Martian summer, when the temperature is above −23 °C, and freeze at lower temperatures. These observations supported earlier hypotheses, based on timing of formation and their rate of growth, that these dark streaks resulted from water flowing just below the surface. However, later work suggested that the lineae may be dry, granular flows instead, with at most a limited role for water in initiating the process. A definitive conclusion about the presence, extent, and role of liquid water on the Martian surface remains elusive. Researchers suspect much of the low northern plains of the planet were covered with an ocean hundreds of meters deep, though this theory remains controversial. In March 2015, scientists stated that such an ocean might have been the size of Earth's Arctic Ocean. This finding was derived from the ratio of protium to deuterium in the modern Martian atmosphere compared to that ratio on Earth. The amount of Martian deuterium (D/H = 9.3 ± 1.7 10−4) is five to seven times the amount on Earth (D/H = 1.56 10−4), suggesting that ancient Mars had significantly higher levels of water. Results from the Curiosity rover had previously found a high ratio of deuterium in Gale Crater, though not significantly high enough to suggest the former presence of an ocean. Other scientists caution that these results have not been confirmed, and point out that Martian climate models have not yet shown that the planet was warm enough in the past to support bodies of liquid water. Near the northern polar cap is the 81.4 kilometres (50.6 mi) wide Korolev Crater, which the Mars Express orbiter found to be filled with approximately 2,200 cubic kilometres (530 cu mi) of water ice. In November 2016, NASA reported finding a large amount of underground ice in the Utopia Planitia region. The volume of water detected has been estimated to be equivalent to the volume of water in Lake Superior (which is 12,100 cubic kilometers). During observations from 2018 through 2021, the ExoMars Trace Gas Orbiter spotted indications of water, probably subsurface ice, in the Valles Marineris canyon system. Orbital motion Mars's average distance from the Sun is roughly 230 million km (143 million mi), and its orbital period is 687 (Earth) days. The solar day (or sol) on Mars is only slightly longer than an Earth day: 24 hours, 39 minutes, and 35.244 seconds. A Martian year is equal to 1.8809 Earth years, or 1 year, 320 days, and 18.2 hours. The gravitational potential difference and thus the delta-v needed to transfer between Mars and Earth is the second lowest for Earth. The axial tilt of Mars is 25.19° relative to its orbital plane, which is similar to the axial tilt of Earth. As a result, Mars has seasons like Earth, though on Mars they are nearly twice as long because its orbital period is that much longer. In the present day, the orientation of the north pole of Mars is close to the star Deneb. Mars has a relatively pronounced orbital eccentricity of about 0.09; of the seven other planets in the Solar System, only Mercury has a larger orbital eccentricity. It is known that in the past, Mars has had a much more circular orbit. At one point, 1.35 million Earth years ago, Mars had an eccentricity of roughly 0.002, much less than that of Earth today. Mars's cycle of eccentricity is 96,000 Earth years compared to Earth's cycle of 100,000 years. Mars has its closest approach to Earth (opposition) in a synodic period of 779.94 days. It should not be confused with Mars conjunction, where the Earth and Mars are at opposite sides of the Solar System and form a straight line crossing the Sun. The average time between the successive oppositions of Mars, its synodic period, is 780 days; but the number of days between successive oppositions can range from 764 to 812. The distance at close approach varies between about 54 and 103 million km (34 and 64 million mi) due to the planets' elliptical orbits, which causes comparable variation in angular size. At their furthest Mars and Earth can be as far as 401 million km (249 million mi) apart. Mars comes into opposition from Earth every 2.1 years. The planets come into opposition near Mars's perihelion in 2003, 2018 and 2035, with the 2020 and 2033 events being particularly close to perihelic opposition. The mean apparent magnitude of Mars is +0.71 with a standard deviation of 1.05. Because the orbit of Mars is eccentric, the magnitude at opposition from the Sun can range from about −3.0 to −1.4. The minimum brightness is magnitude +1.86 when the planet is near aphelion and in conjunction with the Sun. At its brightest, Mars (along with Jupiter) is second only to Venus in apparent brightness. Mars usually appears distinctly yellow, orange, or red. When farthest away from Earth, it is more than seven times farther away than when it is closest. Mars is usually close enough for particularly good viewing once or twice at 15-year or 17-year intervals. Optical ground-based telescopes are typically limited to resolving features about 300 kilometres (190 mi) across when Earth and Mars are closest because of Earth's atmosphere. As Mars approaches opposition, it begins a period of retrograde motion, which means it will appear to move backwards in a looping curve with respect to the background stars. This retrograde motion lasts for about 72 days, and Mars reaches its peak apparent brightness in the middle of this interval. Moons Mars has two relatively small (compared to Earth's) natural moons, Phobos (about 22 km (14 mi) in diameter) and Deimos (about 12 km (7.5 mi) in diameter), which orbit at 9,376 km (5,826 mi) and 23,460 km (14,580 mi) around the planet. The origin of both moons is unclear, although a popular theory states that they were asteroids captured into Martian orbit. Both satellites were discovered in 1877 by Asaph Hall and were named after the characters Phobos (the deity of panic and fear) and Deimos (the deity of terror and dread), twins from Greek mythology who accompanied their father Ares, god of war, into battle. Mars was the Roman equivalent to Ares. In modern Greek, the planet retains its ancient name Ares (Aris: Άρης). From the surface of Mars, the motions of Phobos and Deimos appear different from that of the Earth's satellite, the Moon. Phobos rises in the west, sets in the east, and rises again in just 11 hours. Deimos, being only just outside synchronous orbit – where the orbital period would match the planet's period of rotation – rises as expected in the east, but slowly. Because the orbit of Phobos is below a synchronous altitude, tidal forces from Mars are gradually lowering its orbit. In about 50 million years, it could either crash into Mars's surface or break up into a ring structure around the planet. The origin of the two satellites is not well understood. Their low albedo and carbonaceous chondrite composition have been regarded as similar to asteroids, supporting a capture theory. The unstable orbit of Phobos would seem to point toward a relatively recent capture. But both have circular orbits near the equator, which is unusual for captured objects, and the required capture dynamics are complex. Accretion early in the history of Mars is plausible, but would not account for a composition resembling asteroids rather than Mars itself, if that is confirmed. Mars may have yet-undiscovered moons, smaller than 50 to 100 metres (160 to 330 ft) in diameter, and a dust ring is predicted to exist between Phobos and Deimos. A third possibility for their origin as satellites of Mars is the involvement of a third body or a type of impact disruption. More-recent lines of evidence for Phobos having a highly porous interior, and suggesting a composition containing mainly phyllosilicates and other minerals known from Mars, point toward an origin of Phobos from material ejected by an impact on Mars that reaccreted in Martian orbit, similar to the prevailing theory for the origin of Earth's satellite. Although the visible and near-infrared (VNIR) spectra of the moons of Mars resemble those of outer-belt asteroids, the thermal infrared spectra of Phobos are reported to be inconsistent with chondrites of any class. It is also possible that Phobos and Deimos were fragments of an older moon, formed by debris from a large impact on Mars, and then destroyed by a more recent impact upon the satellite. More recently, a study conducted by a team of researchers from multiple countries suggests that a lost moon, at least fifteen times the size of Phobos, may have existed in the past. By analyzing rocks which point to tidal processes on the planet, it is possible that these tides may have been regulated by a past moon. Human observations and exploration The history of observations of Mars is marked by oppositions of Mars when the planet is closest to Earth and hence is most easily visible, which occur every couple of years. Even more notable are the perihelic oppositions of Mars, which are distinguished because Mars is close to perihelion, making it even closer to Earth. The ancient Sumerians named Mars Nergal, the god of war and plague. During Sumerian times, Nergal was a minor deity of little significance, but, during later times, his main cult center was the city of Nineveh. In Mesopotamian texts, Mars is referred to as the "star of judgement of the fate of the dead". The existence of Mars as a wandering object in the night sky was also recorded by the ancient Egyptian astronomers and, by 1534 BCE, they were familiar with the retrograde motion of the planet. By the period of the Neo-Babylonian Empire, the Babylonian astronomers were making regular records of the positions of the planets and systematic observations of their behavior. For Mars, they knew that the planet made 37 synodic periods, or 42 circuits of the zodiac, every 79 years. They invented arithmetic methods for making minor corrections to the predicted positions of the planets. In Ancient Greece, the planet was known as Πυρόεις. Commonly, the Greek name for the planet now referred to as Mars, was Ares. It was the Romans who named the planet Mars, for their god of war, often represented by the sword and shield of the planet's namesake. In the fourth century BCE, Aristotle noted that Mars disappeared behind the Moon during an occultation, indicating that the planet was farther away. Ptolemy, a Greek living in Alexandria, attempted to address the problem of the orbital motion of Mars. Ptolemy's model and his collective work on astronomy was presented in the multi-volume collection later called the Almagest (from the Arabic for "greatest"), which became the authoritative treatise on Western astronomy for the next fourteen centuries. Literature from ancient China confirms that Mars was known by Chinese astronomers by no later than the fourth century BCE. In the East Asian cultures, Mars is traditionally referred to as the "fire star" (火星) based on the Wuxing system. In 1609 Johannes Kepler published a 10 year study of Martian orbit, using the diurnal parallax of Mars, measured by Tycho Brahe, to make a preliminary calculation of the relative distance to the planet. From Brahe's observations of Mars, Kepler deduced that the planet orbited the Sun not in a circle, but in an ellipse. Moreover, Kepler showed that Mars sped up as it approached the Sun and slowed down as it moved farther away, in a manner that later physicists would explain as a consequence of the conservation of angular momentum.: 433–437 In 1610 the first use of a telescope for astronomical observation, including Mars, was performed by Italian astronomer Galileo Galilei. With the telescope the diurnal parallax of Mars was again measured in an effort to determine the Sun-Earth distance. This was first performed by Giovanni Domenico Cassini in 1672. The early parallax measurements were hampered by the quality of the instruments. The only occultation of Mars by Venus observed was that of 13 October 1590, seen by Michael Maestlin at Heidelberg. By the 19th century, the resolution of telescopes reached a level sufficient for surface features to be identified. On 5 September 1877, a perihelic opposition to Mars occurred. The Italian astronomer Giovanni Schiaparelli used a 22-centimetre (8.7 in) telescope in Milan to help produce the first detailed map of Mars. These maps notably contained features he called canali, which, with the possible exception of the natural canyon Valles Marineris, were later shown to be an optical illusion. These canali were supposedly long, straight lines on the surface of Mars, to which he gave names of famous rivers on Earth. His term, which means "channels" or "grooves", was popularly mistranslated in English as "canals". Influenced by the observations, the orientalist Percival Lowell founded an observatory which had 30- and 45-centimetre (12- and 18-in) telescopes. The observatory was used for the exploration of Mars during the last good opportunity in 1894, and the following less favorable oppositions. He published several books on Mars and life on the planet, which had a great influence on the public. The canali were independently observed by other astronomers, like Henri Joseph Perrotin and Louis Thollon in Nice, using one of the largest telescopes of that time. The seasonal changes (consisting of the diminishing of the polar caps and the dark areas formed during Martian summers) in combination with the canals led to speculation about life on Mars, and it was a long-held belief that Mars contained vast seas and vegetation. As bigger telescopes were used, fewer long, straight canali were observed. During observations in 1909 by Antoniadi with an 84-centimetre (33 in) telescope, irregular patterns were observed, but no canali were seen. The first spacecraft from Earth to visit Mars was Mars 1 of the Soviet Union, which flew by in 1963, but contact was lost en route. NASA's Mariner 4 followed and became the first spacecraft to successfully transmit from Mars; launched on 28 November 1964, it made its closest approach to the planet on 15 July 1965. Mariner 4 detected the weak Martian radiation belt, measured at about 0.1% that of Earth, and captured the first images of another planet from deep space. Once spacecraft visited the planet during the 1960s and 1970s, many previous concepts of Mars were radically broken. After the results of the Viking life-detection experiments, the hypothesis of a dead planet was generally accepted. The data from Mariner 9 and Viking allowed better maps of Mars to be made. Until 1997 and after Viking 1 shut down in 1982, Mars was only visited by three unsuccessful probes, two flying past without contact (Phobos 1, 1988; Mars Observer, 1993), and one (Phobos 2 1989) malfunctioning in orbit before reaching its destination Phobos. In 1997 Mars Pathfinder became the first successful rover mission beyond the Moon and started together with Mars Global Surveyor (operated until late 2006) an uninterrupted active robotic presence at Mars that has lasted until today. It produced complete, extremely detailed maps of the Martian topography, magnetic field and surface minerals. Starting with these missions a range of new improved crewless spacecraft, including orbiters, landers, and rovers, have been sent to Mars, with successful missions by the NASA (United States), Jaxa (Japan), ESA, United Kingdom, ISRO (India), Roscosmos (Russia), the United Arab Emirates, and CNSA (China) to study the planet's surface, climate, and geology, uncovering the different elements of the history and dynamic of the hydrosphere of Mars and possible traces of ancient life. As of 2023[update], Mars is host to ten functioning spacecraft. Eight are in orbit: 2001 Mars Odyssey, Mars Express, Mars Reconnaissance Orbiter, MAVEN, ExoMars Trace Gas Orbiter, the Hope orbiter, and the Tianwen-1 orbiter. Another two are on the surface: the Mars Science Laboratory Curiosity rover and the Perseverance rover. Collected maps are available online at websites including Google Mars. NASA provides two online tools: Mars Trek, which provides visualizations of the planet using data from 50 years of exploration, and Experience Curiosity, which simulates traveling on Mars in 3-D with Curiosity. Planned missions to Mars include: As of February 2024[update], debris from these types of missions has reached over seven tons. Most of it consists of crashed and inactive spacecraft as well as discarded components. In April 2024, NASA selected several companies to begin studies on providing commercial services to further enable robotic science on Mars. Key areas include establishing telecommunications, payload delivery and surface imaging. Habitability and habitation During the late 19th century, it was widely accepted in the astronomical community that Mars had life-supporting qualities, including the presence of oxygen and water. However, in 1894 W. W. Campbell at Lick Observatory observed the planet and found that "if water vapor or oxygen occur in the atmosphere of Mars it is in quantities too small to be detected by spectroscopes then available". That observation contradicted many of the measurements of the time and was not widely accepted. Campbell and V. M. Slipher repeated the study in 1909 using better instruments, but with the same results. It was not until the findings were confirmed by W. S. Adams in 1925 that the myth of the Earth-like habitability of Mars was finally broken. However, even in the 1960s, articles were published on Martian biology, putting aside explanations other than life for the seasonal changes on Mars. The current understanding of planetary habitability – the ability of a world to develop environmental conditions favorable to the emergence of life – favors planets that have liquid water on their surface. Most often this requires the orbit of a planet to lie within the habitable zone, which for the Sun is estimated to extend from within the orbit of Earth to about that of Mars. During perihelion, Mars dips inside this region, but Mars's thin (low-pressure) atmosphere prevents liquid water from existing over large regions for extended periods. The past flow of liquid water demonstrates the planet's potential for habitability. Recent evidence has suggested that any water on the Martian surface may have been too salty and acidic to support regular terrestrial life. The environmental conditions on Mars are a challenge to sustaining organic life: the planet has little heat transfer across its surface, it has poor insulation against bombardment by the solar wind due to the absence of a magnetosphere and has insufficient atmospheric pressure to retain water in a liquid form (water instead sublimes to a gaseous state). Mars is nearly, or perhaps totally, geologically dead; the end of volcanic activity has apparently stopped the recycling of chemicals and minerals between the surface and interior of the planet. Evidence suggests that the planet was once significantly more habitable than it is today, but whether living organisms ever existed there remains unknown. The Viking probes of the mid-1970s carried experiments designed to detect microorganisms in Martian soil at their respective landing sites and had positive results, including a temporary increase in CO2 production on exposure to water and nutrients. This sign of life was later disputed by scientists, resulting in a continuing debate, with NASA scientist Gilbert Levin asserting that Viking may have found life. A 2014 analysis of Martian meteorite EETA79001 found chlorate, perchlorate, and nitrate ions in sufficiently high concentrations to suggest that they are widespread on Mars. UV and X-ray radiation would turn chlorate and perchlorate ions into other, highly reactive oxychlorines, indicating that any organic molecules would have to be buried under the surface to survive. Small quantities of methane and formaldehyde detected by Mars orbiters are both claimed to be possible evidence for life, as these chemical compounds would quickly break down in the Martian atmosphere. Alternatively, these compounds may instead be replenished by volcanic or other geological means, such as serpentinite. Impact glass, formed by the impact of meteors, which on Earth can preserve signs of life, has also been found on the surface of the impact craters on Mars. Likewise, the glass in impact craters on Mars could have preserved signs of life, if life existed at the site. The Cheyava Falls rock discovered on Mars in June 2024 has been designated by NASA as a "potential biosignature" and was core sampled by the Perseverance rover for possible return to Earth and further examination. Although highly intriguing, no definitive final determination on a biological or abiotic origin of this rock can be made with the data currently available. Several plans for a human mission to Mars have been proposed, but none have come to fruition. The NASA Authorization Act of 2017 directed NASA to study the feasibility of a crewed Mars mission in the early 2030s; the resulting report concluded that this would be unfeasible. In addition, in 2021, China was planning to send a crewed Mars mission in 2033. Privately held companies such as SpaceX have also proposed plans to send humans to Mars, with the eventual goal to settle on the planet. As of 2024, SpaceX has proceeded with the development of the Starship launch vehicle with the goal of Mars colonization. In plans shared with the company in April 2024, Elon Musk envisions the beginning of a Mars colony within the next twenty years. This would be enabled by the planned mass manufacturing of Starship and initially sustained by resupply from Earth, and in situ resource utilization on Mars, until the Mars colony reaches full self sustainability. Any future human mission to Mars will likely take place within the optimal Mars launch window, which occurs every 26 months. The moon Phobos has been proposed as an anchor point for a space elevator. Besides national space agencies and space companies, groups such as the Mars Society and The Planetary Society advocate for human missions to Mars. In culture Mars is named after the Roman god of war (Greek Ares), but was also associated with the demi-god Heracles (Roman Hercules) by ancient Greek astronomers, as detailed by Aristotle. This association between Mars and war dates back at least to Babylonian astronomy, in which the planet was named for the god Nergal, deity of war and destruction. It persisted into modern times, as exemplified by Gustav Holst's orchestral suite The Planets, whose famous first movement labels Mars "The Bringer of War". The planet's symbol, a circle with a spear pointing out to the upper right, is also used as a symbol for the male gender. The symbol dates from at least the 11th century, though a possible predecessor has been found in the Greek Oxyrhynchus Papyri. The idea that Mars was populated by intelligent Martians became widespread in the late 19th century. Schiaparelli's "canali" observations combined with Percival Lowell's books on the subject put forward the standard notion of a planet that was a drying, cooling, dying world with ancient civilizations constructing irrigation works. Many other observations and proclamations by notable personalities added to what has been termed "Mars Fever". In the present day, high-resolution mapping of the surface of Mars has revealed no artifacts of habitation, but pseudoscientific speculation about intelligent life on Mars still continues. Reminiscent of the canali observations, these speculations are based on small scale features perceived in the spacecraft images, such as "pyramids" and the "Face on Mars". In his book Cosmos, planetary astronomer Carl Sagan wrote: "Mars has become a kind of mythic arena onto which we have projected our Earthly hopes and fears." The depiction of Mars in fiction has been stimulated by its dramatic red color and by nineteenth-century scientific speculations that its surface conditions might support not just life but intelligent life. This gave way to many science fiction stories involving these concepts, such as H. G. Wells's The War of the Worlds, in which Martians seek to escape their dying planet by invading Earth; Ray Bradbury's The Martian Chronicles, in which human explorers accidentally destroy a Martian civilization; as well as Edgar Rice Burroughs's series Barsoom, C. S. Lewis's novel Out of the Silent Planet (1938), and a number of Robert A. Heinlein stories before the mid-sixties. Since then, depictions of Martians have also extended to animation. A comic figure of an intelligent Martian, Marvin the Martian, appeared in Haredevil Hare (1948) as a character in the Looney Tunes animated cartoons of Warner Brothers, and has continued as part of popular culture to the present. After the Mariner and Viking spacecraft had returned pictures of Mars as a lifeless and canal-less world, these ideas about Mars were abandoned; for many science-fiction authors, the new discoveries initially seemed like a constraint, but eventually the post-Viking knowledge of Mars became itself a source of inspiration for works like Kim Stanley Robinson's Mars trilogy. See also Notes References Further reading External links Solar System → Local Interstellar Cloud → Local Bubble → Gould Belt → Orion Arm → Milky Way → Milky Way subgroup → Local Group → Local Sheet → Local Volume → Virgo Supercluster → Laniakea Supercluster → Pisces–Cetus Supercluster Complex → Local Hole → Observable universe → UniverseEach arrow (→) may be read as "within" or "part of". |
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[SOURCE: https://www.mako.co.il] | [TOKENS: 12810] |
"אם הייתי איראני הייתי מודאג": כך תשותק טהרןחשיפה חריגה של ארה"ב מראה את יכולות התקיפה שלה במזרח התיכון, אבל מערך אחד בולט מעל כולם: זה מה שבאמת צריך להדאיג את האיראנים12:45שי לויהמערך המסווג נחשף "אם הייתי איראני הייתי מודאג": כך תשותק טהרן חשיפה חריגה של ארה"ב מראה את יכולות התקיפה שלה במזרח התיכון, אבל מערך אחד בולט מעל כולם: זה מה שבאמת צריך להדאיג את האיראנים עזה חדשהאיזה כוח זר ישלוט בכל אזור ברצועה: המפה נחשפת10:41שי לוי עדיין סכנה באזורהמצוק בחוף האהוב בשרון קרס - והתיעוד משוגע12:33 אחרי שהואשם במותההשאיר את בת זוגו לקפוא על הר. עכשיו הוא מגיב10:43גיא רייט השחקן האהוב חושף"אבא שלי ישב בכלא, חברים שלו היו נרקומנים"12:07איתמר רונאל בלי מאמץטכנולוגיית ה-AI שתעצב לכם את הארון בתוך דקותבשיתוף רהיטי דורון אני יכולה להתחיל סרטון חצי ערומה. אני אעשה מה שבא לישי זנקו על סערת יעל פוליאקוב: "בעיניי היא בחורה מסכנה" שי זנקו על סערת יעל פוליאקוב: "בעיניי היא בחורה מסכנה" עם פבלו אסקובר על הזרוע: "קבלן הביצוע" של העולם התחתון"עובד מתחת לרדאר": הילד מרחובות הפך לפושע שאף אחד לא מצליח לפצח "עובד מתחת לרדאר": הילד מרחובות הפך לפושע שאף אחד לא מצליח לפצח קוראים לי אוחצ'ה כי הדיבור שלי נשי. אני מדבר עם הידייםשלומי ואסף מ"המירוץ למיליון" על הקשיים הכלכליים, החברות והחלומות שלומי ואסף מ"המירוץ למיליון" על הקשיים הכלכליים, החברות והחלומות 730 אלף העוקבים לא משחררים מהפדיחה של שחר חיון הרגתי בטעות נער וסלחתי לעצמי בזכות סם מסיבות 180 אלף עוקבים לא טועים: הסוד של בן שי לצ'יפס המושלם לפני 14 דקותמצוק קרס בחוף סידני עלי בהרצליה - רשות הטבע והגנים מזהירה: קיימת סכנת התמוטטות מיידית לאורך כל החוף מצוק קרס בחוף סידני עלי בהרצליה - רשות הטבע והגנים מזהירה: קיימת סכנת התמוטטות מיידית לאורך כל החוף 11:01ברצלונה: אחרי עשרות שנות בניה סגרדה פמיליה הגיעה לגובהה המרבי כשאתמול הוצב הצלב הגדול שבראשה ברצלונה: אחרי עשרות שנות בניה סגרדה פמיליה הגיעה לגובהה המרבי כשאתמול הוצב הצלב הגדול שבראשה 10:38צה"ל מאשר את הדיווחים: מספר רב של מחבלי חיזבאללה חוסלו בלבנון צה"ל מאשר את הדיווחים: מספר רב של מחבלי חיזבאללה חוסלו בלבנון 08:17צילומי לוויין שפורסמו בניו יורק טיימס חושפים: יותר מ-60 מטוסי קרב אמריקניים נפרסו בבסיס בירדן צילומי לוויין שפורסמו בניו יורק טיימס חושפים: יותר מ-60 מטוסי קרב אמריקניים נפרסו בבסיס בירדן 08:13משרד החוץ של סרביה: קוראים לכל אזרחינו לעזוב את איראן מיד משרד החוץ של סרביה: קוראים לכל אזרחינו לעזוב את איראן מיד לונה פארק של הטבע:בכל הארץ ממש יפה כרגע - אבל כאן הכי07:00מירב טלמור-קשי "לכו לה****ן"הכוכב הבריטי ששיחק בטהרן מגיב להספד על המפיקה הישראלית10:30גיל משעלי סופו של עידן2 טריליון דולר נמחקו: אפוקליפסת ה-AI כבר פה09:04דרור גלוברמן ודני פלד בולט מעל כולםהשף הכי מפוקפק בטלוויזיה מציג: תראו, ציפור11:54רועי אבן מהפכה במגזר החרדיזה המוצר שהפך לסמל סטטוסבשיתוף GWS 22:37ריקי מרטין נכנס לבר במיאמי. רואה שלט שריקי מרטין ברשימה של מי ששותה חינם. ריקי מרטין שותה ריקי מרטין נכנס לבר במיאמי. רואה שלט שריקי מרטין ברשימה של מי ששותה חינם. ריקי מרטין שותה 22:33עומר וגל אדם עושים את "הסוף הזה" מתוך האלבום החדש שיצא השבוע עומר וגל אדם עושים את "הסוף הזה" מתוך האלבום החדש שיצא השבוע 21:37קורע לב: המילים האחרונות של אריק דיין לבנותיו קורע לב: המילים האחרונות של אריק דיין לבנותיו 16:56"הייתי פה בת 17": נתן דטנר מפתיע את גלית גוטמן בשידור ומחזיר אותה לרגע משותף מהעבר "הייתי פה בת 17": נתן דטנר מפתיע את גלית גוטמן בשידור ומחזיר אותה לרגע משותף מהעבר 20.02.26טיפקס במופע מיוחד 360 בבארבי מבצעים את "ברית עולם" לזכרו של מתי כספי טיפקס במופע מיוחד 360 בבארבי מבצעים את "ברית עולם" לזכרו של מתי כספי התקיפה מתקרבת?"הפנטגון פינה מאות חיילים מבסיסים במזרח התיכון"07:48כתבי החדשות מאות נפלו בפח"כאן מס הכנסה, יש חוק חדש": כך עובד עוקץ המיליונים06:32שמעון איפרגן אחרי 30 שנהאליס מילר חושפת לראשונה את הסיבה שלא התגייסה לטיס06:37דסק קשת 12 לוח הזמנים מצטמצם"חלון הזדמנויות היסטורי להחלשת המשטר - עד כדי הפלתו"20:40ניר דבורי, דנה ויס במקום אי המפציציםהמעצמה שאמרה לא לטראמפ - והתוכנית החלופית למתקפה17:26תומר אלמגור ההסתבכות של "מלך הקזינו" של באטומי14:00שמעון איפרגן חשד לרצח"גרם לחברתו לשתות חומצה כשהיא חשבה שזה מים"10:08שמעון איפרגן הזהב של ארגוני הפשע: "זה בלון החמצן שלהם"08:51שמעון איפרגן "היא כפתה עלינו לקיים יחסי מין בזמן הריון ומחזור"19.02.26שמעון איפרגן החיים החדשים של כראג'ה: "נטש את עולם הפשע"12:18שמעון איפרגן כמעט הרס לה: המתנה של קיילי ג'נר לטימותי שאלאמה08:28mako סלבס "אני חושב שהיא בהיריון וזו הייתה חתונת בזק"06:45mako סלבס מגישת החדשות נפצעה ונזקקה לטיפול רפואי19.02.26לילך מרקוביץ' לפני הלידהדנה פרידר חוגגת 39 עם יהודה לוי בתמונות היריון חדשות19.02.26לילך מרקוביץ' אחרי שהתנגדה: יולי ויצמן על הזוגיות של אמה19.02.26לילך מרקוביץ' לא עצרו לרגעזה מה שהזוגות בחרו לעשות אחרי שבוע סוער בכותרות09:44 סוגרת חשבוןאחרי האמירה של פוליאקוב: יוצרת התוכן סוגרת חשבון22:36משה אבוטבול טרחנות או חברות?טל שמש: "אם את לא מרימה לי - את פשוט קנאית"20.02.26משה אבוטבול שחר טבוך חושף"כל יום הייתי מקבל איום נוסף"19.02.26משה אבוטבול "שומעים פיצוץ"הדרמה הלילית של אליאב זוהר ונבו עמרני18.02.26משה אבוטבול רואה הכל:ארז איסקוב הוא נער הפוסטר של ההתפרקות הישראלית22:15רועי אבן יו לורי תוקף אחרי מותה של דנה עדן: "לא ציוני"10:30גיל משעלי היוצרים הישראלים שהתעמתו עם טיירה בנקס20.02.26דודי כספי, לוס אנג'לס קורע לב: המילים האחרונות של הכוכב לבנותיו06:40mako תרבות ימיו האחרונים של אריק דיין: "איבד את היכולת לדבר"19:10מיכל דאבי בן שי מציג: סוד הצ'יפס המושלם מאמסטרדם (ואיך עושים את זה בבית)למתכון בן שי מציג: סוד הצ'יפס המושלם מאמסטרדם (ואיך עושים את זה בבית) נוסעים צפונה? הכירו את הפנינה האיטלקית שמסתתרת בתוך קיבוץ הגושריםלכתבה נוסעים צפונה? הכירו את הפנינה האיטלקית שמסתתרת בתוך קיבוץ הגושרים ארוחת צהריים טובה והגונה במסעדה משפחתית? אף פעם לא נסרב לדבר כזהלכתבה ארוחת צהריים טובה והגונה במסעדה משפחתית? אף פעם לא נסרב לדבר כזה לא, זאת לא עוגת בננות. מה זה כן?למתכון לא, זאת לא עוגת בננות. מה זה כן? נראה טעים? זה אפילו עוד יותר טעים ממה שנראהלמתכון נראה טעים? זה אפילו עוד יותר טעים ממה שנראה מתכוןבן שי במדור חדש: זה הסוד של הצ'יפס ההולנדי20.02.26בן שי המסעדה שמצליחה לעשות את זה - בלי יחצ וטיקטוק19.02.26ריטה גולדשטיין לא מזמן עמדו כאן טנקים. היום יש כאן מעדנייה20.02.26לין לוי מושיק רוט מרחיב את התפריט, ואתם בוחרים מה לאכול19.02.26לין לוי סרטן הריאה:בדיקה קטנה, חיים ארוכיםבשיתוף אסטרזניקה שינו כיווןזינוק של עשרות אחוזים: היעד שהישראלים כבשו19.02.26אסף וקנין עולם סודי: מה קורה אחרי ששולחים את המזוודה בנתב"ג?20.02.26נטע חורב ישראלים פחדו להגיע לכאן - עכשיו מחכים להם שיגיעו18:11אורלי גנוסר בגלל האוכל הטבע והאווירה: עגלות הקפה הכי טובות בארץ הלונה פארק של הטבע: המקום המושלם לטיול משפחתי07:00מירב טלמור-קשי צמרמורת בכל הגוף: הסיכונים באולימפיאדת החורף הם בלתי צפויים לפעמים צמרמורת בכל הגוף: הסיכונים באולימפיאדת החורף הם בלתי צפויים לפעמים זה הסיבוב דאויין הכי פחות דאויין שראינו זה הסיבוב דאויין הכי פחות דאויין שראינו בירה הוא משקה האלים, ולפעמים גם האלים משתוללים בירה הוא משקה האלים, ולפעמים גם האלים משתוללים החיים של משפיענית אוכל יכולים להיות מסובכים לפעמים. אבל העיקר הנקמה החיים של משפיענית אוכל יכולים להיות מסובכים לפעמים. אבל העיקר הנקמה זוכרים את הימים שהשוער היה עולה למגרש עם כובע מצחייה? אז כזה זוכרים את הימים שהשוער היה עולה למגרש עם כובע מצחייה? אז כזה הוא החליט לתת לכלב שלו סודה. הכלב, תתפלאו לשמוע, פחות התחבר הוא החליט לתת לכלב שלו סודה. הכלב, תתפלאו לשמוע, פחות התחבר "ארוסתי נעלמה. אני לא מוצא אותה בשום מקום"09:50גיא רייט השאיר את בת זוגו לקפוא על הר. עכשיו הוא מגיב06:00גיא רייט התחממות לפני המהפך: הגשם יגיע בתחילת השבוע06:00גיא רייט "מקבלת את האחריות"המורה הורשעה בעבירה חמורה - ותשוחרר בגיל 8519.02.26גיא רייט התעלול שעלה ביוקר"מישהו רוצה להסביר לי מה לעזאזל אני רואה כאן?"19.02.26גיא רייט מאחורי להיט האייטיז הענק מסתתר סוף עצוב18:23זוהר צלח פרסום ראשוןאחרי המלחמה עליו: הבית החדש של נווה לוי19.02.26גיל משעלי פרסום ראשוןהדיג'יי האגדי יגיע לארץ למרות המתיחות עם איראן19.02.26זוהר צלח "בוכה כמו מטומטמת"עומר אדם גרם למעריצה למרר בבכי19.02.26גיל משעלי עם מיליוני צפיותהשיר שמחרפן את הטיקטוק הישראלי19.02.26גיל משעלי שי זנקואני לא יכולה להאשים את יעל פוליאקוב. בעיניי היא מסכנה כבר מעבר לטרנדהמדפים מלאים בביוטי קוריאני. קבלו את המדריך השלם מעורר קנאהעדן פינס ארזה את כל הביקיניז שצריך לחופשה רומנטית מתנה בשישי500 שקלים לקנייה ב-TFU TFU אליס מילר חושפת"חשבתי שמנסים להרעיל אותי בעזרת רעל במים"23:20דסק קשת 12 נריה זינגבוים מ"המירוץ": "לא מגדיר את עצמי"08:00יובל פלד מזהים? זו אחת המשפחות החזקות בישראל12:14יובל פלד איתי אנגל פוגש את המבוקשת מס' 1 באיראן20.02.26איתי אנגל, יהודית וינברגר עינב בובליל: "כששמעתי שאני בהיריון חרב עליי עולמי"19.02.26דסק קשת 12 LIVEקשת 12 בשידור חי27.01.25 "אם הייתי איראני הייתי מודאג": כך תשותק טהרן20.02.26שי לוי רוסיה מתאמנת עם איראן אך מסתירה משבר מבית20.02.26 כך צפויה להתחלק השליטה בעזה בין הכוחות הזרים10:41שי לוי לגיטימי לעזוב? הדילמה של עדי ניצן עוררה סערה20:20נועה יחיאלי 1 מ-6 נשים תחווה מחשבות אובדניות בתקופה הזאת20.02.26ד"ר ישראל יולס שימו לב: ריקול נרחב למוצרי פיסטוק מקולף19.02.26יונתן דושניצקי "פחד מטורף": שלשולים ממושכים שלעתים כללו דם19.02.26יונתן דושניצקי ההתמודדות עם SMA"גילוי מוקדם יכול לשנות חיים"בשיתוף רוש פרמצבטיקה הבוטיק החדששמענו שזה המלון הכי שווה בים המלח אז ירדנו לראות07:50קרן לוי צדק חלום אסייתית"א: זו לא וילה, זה פנטהאוז מטורף של 300 מ"ר19.02.26קליה מור כל הפתרונותיוצאים לכם מים חומים מהברז? זה מה שצריך לעשות13:20 מעצבת:מעצבת: "חשבתי שזה יהיה פוסט מעורר מחלוקת - הופתעתי"19.02.26דנה ברוזה "הייתי מקיאה בעבודה, הגוף ידע שמשהו לא בסדר"11:54זוהר צלח "שלחתי כמויות קורות חיים, קיבלתי מאות פעמים לא"19.02.26דנה גוטרזון כולם בטירוףתשכחו מ-ChatGPT: זה הכלי שבאמת משנה את העולם19.02.26דיגיטל "אנשים אמרו: ׳אנחנו עובדים בחברת סיגריות'"19.02.26דרור גלוברמן 2 טריליון דולר נמחקו: אפוקליפסת ה-AI כבר פה11:56דרור גלוברמן ודני פלד מה באמת קורה בבתים המוזנחים במרכז הארץ?19:20שוקי שדה, שומרים איך חברה כמו דן מצליחה לעשות אקזיט מיליארדיםאפרת נומברג יונגר, נמרוד מירום הסכום המשוגע שקיבלו המשפיעניות ממירי רגב19.02.26אפרת נומברג יונגר עוקץ הדואר: הזמינו אלפי חבילות ומכרו אותן19.02.26אפרת נומברג יונגר לבנון רותחת אחרי שמחירי הדלק זינקו בן לילה19.02.26אפרת נומברג יונגר הדרגנועים של חיפה: הצצה ראשונה למסלול20.02.26עופר פטרסבורג המדד המפתיע: אילו ערים בצמרת הביקושים בדרום?19.02.26עופר פטרסבורג עסקת ענק: ישראל קנדה בולעת את אקרו19.02.26עופר פטרסבורג 137 דירות, 100 חדרי מלון ו-29 קומות משרדים19.02.26עופר פטרסבורג קבוצת מזרחי תבנה 138 דירות חדשות בבת ים19.02.26עופר פטרסבורג ברקת תעמיד 1.15 מיליארד שקל בשדה דב19.02.26עופר פטרסבורג יכול להיות שהאוויר במשרד מזוהם יותר מבחוץ?18.02.26עופר פטרסבורג פרויקט פינוי-בינוי של 1,452 דירות בחדרה18.02.26עופר פטרסבורג "הענף עובר מהפכה": קבלנים ילמדו לתואר ראשון18.02.26עופר פטרסבורג אזורים פורצת לעולם המסחר18.02.26עופר פטרסבורג פרויקט הבינוי ביבנה שמתחיל לזוז אחרי 8 שנים18.02.26עופר פטרסבורג איך נמכרו פתאום עשרות דירות ברחוב אחד בבת ים17.02.26עופר פטרסבורג שני מיליארד שקלים לפרויקט פינוי-בינוי בפ"ת17.02.26עופר פטרסבורג רשות מקרקעי ישראל פינתה 6,000 דונם בנגב17.02.26עופר פטרסבורג "הטרור לא יחליט בשבילי אם להיות אמא"19.02.26נטע חורב יעל ברון"אני מפנק, אבל האמת שכולן רוצות רק כסף"19.02.26יעל ברון החידה השבועיתאם תצליחו לענות בתוך 20 שניות אתם גאונים20.02.26הפרופסור הלא מפוזר "למה ילדה צריכה לדעת?": סערת סרטון המחזור19.02.26שרי שיין ההערה מהגן שגורמת להורים לאבד שינה19.02.26עדי שמיע-עצמון, ליעד גרוס, עדן אלוני המהפכה במגזר החרדי: המוצר שהפך לסמל סטטוסבשיתוף GWS 50 רקדנים ותזמורת: ההפקה שתשתלט על האופרה17.02.26זוהר צלח לייב עם להקה: המופע החדש של הדיג'יי הלוהט15.02.26זוהר צלח הסטארטאפ הישראלי שגייס 30 מיליון דולר12.02.26זוהר צלח הפלירטוטים באינטרנט עלו לבעל עשרות אלפי דולרים19.02.26עו"ד נטלי יורובסקי העסקת עובדים זרים: הרפורמה שאחרי המלחמה19.02.26פסקדין "אב לנערים שעובדים לא צריך לשלם מזונות"18.02.26עו"ד יעקב בלס הלקח המשפטי מהסיפור של מתן בלו17.02.26עו"ד איריס ירדני שינה את חייו: הקשר בין דיילה לניר ביטון11:30 השכר וההשפעה: לקראת הקרב של גורדון11:29 אחרי 102 שנה: אקס מכבי יעשה היסטוריה?11:12 15 נק` ו-13 אס` לדני, 103:157 עצום לדנבר09:03 "היו חגיגות של שעות של סקס קבוצתי וסמים, הכל מעורפל"06:47mako גאווה הזמרת הדתייה על היציאה מהארון בפני הוריה: "זה היה קשה"20.02.26דור בביוף התגובה בישראל לגירוש הצעירה הטרנסית מגיאורגיה20.02.26אלעד שלו התאריך נחשףכל הפרטים על מסיבת הפורים של עופר ניסים18.02.26mako גאווה "הוא משך לי בציציות ואמר 'מה אתה עושה פה'?"18.02.26אלעד שלו בית המשפט נגד העמותה ההומופובית: "צעד חשוב"18.02.26אלעד שלו בעקבות הביקורת: הכוכבת ביטלה את הגעתה לישראל17.02.26אלעד שלו האב הטרנסג’נדר ירה בבני משפחתו והתאבד17.02.26mako גאווה כוכב הריאליטי: "הפסקתי להתנצל על מי שאני"16.02.26 יוצרי הסרט המיתולוגי מתנצלים אחרי 35 שנה16.02.26אלעד שלו "בחרנו לא לעשות ילדים, לא הרגשתי צורך בכך"15.02.26מיכל ליבר-רונן "התאהבתי באשתי באמת, עד שפגשתי גבר"15.02.26ליטן לשינר זוג יוצרי התוכן: "מתחילים בקרוב הליך היריון"14.02.26אלעד שלו הליין החדש שנפתח בת"א: "נמאס ממסיבות ומסמים"13.02.26אלעד שלו מי אחראי פה: זה ג'יפ היוקרה של השף המפורסם יש דבר כזה חשמלית ספורטיבית? בדקנו את אלפין מאחורי ה-0 ק"מ: כך אתם מנפחים את רווחי היבואן טויוטה יאריס הבאה תעבור מהפכה, קטנה וגדולה זה ישתלם לכםכל מה שאתם חייבים לבדוק לפני רכישת רכבבשיתוף ניסאן חופשת שופינגהערים הכי שוות לשופינג באירופה בתקופה הקרובה הזמנה מוקדמת לפסחשריינו מראש וסגרו לכם חופשת פסח חלומית בלי לשבור את הכיסמצאנו לכם הורדת מחיר לחופשות ינואר פברואר Finder TOP20המערכת שמזהה הורדת מחיר ומאתרת את החופשות הכי משתלמות הזמנה מוקדמת לקיץזה הזמן לתפוס את כל החופשות הכי שוות לקיץ לא רק מלון: הפרויקט החדש על חוף הרצליהבשיתוף Medio נדל"ן בשידור חיכך קיבלו הדיירים עיינים באתרי הבנייה - 24/7בשיתוף Medio חיי קהילה מהיום הראשון: לגור בשכונה שיש בה הכול בלי לרדוףהמודל החדש שיחסוך לרוכשי דירות זמן וכסףבשיתוף Medio נדל"ן בשיתוף אונ' הפתוחהמה באמת יעניק לכם יתרון בקריירה העתידית?בשיתוף האונ' הפתוחה בשיתוף פיצה האטחושבים שאת מצליחים לזהות את התמונות המטושטות? בשיתוף GELLYהצטרפנו לפיינליסטים של "הכוכב הבא" בדרך לרגע הסיוםבשיתוף GELLY בשיתוף לבלואפקט ה'וואו': המוצר הגאוני החדש לשפתיים רכות וזוהרותבשיתוף לבלו לאה שנירר ודוד דביר על הטיפולים שעברו18.02.26 הסיכוי לאוסקר: סרט ישראלי יתמודד על הפסלון18.02.26 הרקדן מבוליווד שפתח מסעדה בתל אביב18.02.26 למרות שהודה בתקיפה: שי אביטל מתחיל מחדש17.02.26 נועה קירל חוזרת לביקור בבית ילדותה17.02.26 |
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[SOURCE: https://en.wikipedia.org/wiki/Nubia] | [TOKENS: 12868] |
Contents Nubia Nubia (/ˈnjuːbiə/ NEW-bee-uh; Nobiin: Nobīn; Arabic: النُوبَة, romanized: an-Nūba) is a region along the Nile river encompassing the area between the confluence of the Blue and White Niles (near Khartoum in central Sudan) and the First Cataract (south of Aswan in southern Egypt). It was the seat of one of the earliest civilizations of ancient Africa, the Kerma culture, which lasted from around 2500 BC until its conquest by the New Kingdom of Egypt under Pharaoh Thutmose I around 1500 BC. Egyptian heirs subsequently ruled much of Nubia for the next four centuries. Nubia was home to several empires, most prominently the Kingdom of Kush. This kingdom conquered Egypt in the eighth century BC under Piye, ruling as its 25th Dynasty. From the 3rd century BC to the 3rd century AD, northern Nubia was invaded and annexed by Egypt, then under the rule of the Greeks and later the Romans; this territory was known in the Greco-Roman world as the Dodekaschoinos. The collapse of Kush in the 4th century AD was preceded by an invasion from the Kingdom of Aksum and followed by the rise of three Christian kingdoms: Nobatia, Makuria, and Alodia. Makuria and Alodia endured for roughly a millennium. Their eventual decline precipitated both the partition of Nubia in the 16th century—into a northern half conquered by the Ottoman Empire and a southern half by the Sennar sultanate—and a rapid process of Islamization and partial Arabization of the Nubian people. Nubia was later reunited under the Khedivate of Egypt in the 19th century. Today, the region is divided between Egypt and Sudan. Ancient Nubians pioneered early antibiotics and established a system of geometrics which served as the basis for initial sunclocks. Nubians also exercised a trigonometric methodology comparable to their Egyptian counterparts. The interdisciplinary study of ancient Nubia, combining archaeology, history, and philology, is known as Nubiology. Linguistics Historically, the people of Nubia spoke at least two varieties of Nubian languages, a subfamily that includes Nobiin (the descendant of Old Nubian), Dongolawi, Midob and several related varieties in the northern part of the Nuba Mountains in South Kordofan. The Birgid language was spoken north of Nyala in Darfur, but became extinct as late as 1970. However, the linguistic identity of the ancient Kerma culture of southern and central Nubia (also known as Upper Nubia), is uncertain; some research suggests that it belonged to the Cushitic branch of the Afroasiatic languages, while more recent studies indicate that the Kerma culture belonged to the Eastern Sudanic branch of Nilo-Saharan languages instead, and that other peoples of northern or Lower Nubia north of Kerma (such as the C-Group culture and the Blemmyes) spoke Cushitic languages before the spread of Eastern Sudanic languages from southern or Upper Nubia. Geography Nubia was divided into three major regions: Upper, Middle, and Lower Nubia, in reference to their locations along the Nile. "Lower" referred to regions downstream (further north) and "upper" to regions upstream (further south). Lower Nubia lay between the First and the Second Cataracts within the current borders of Egypt, Middle Nubia lay between the Second and the Third Cataracts, and Upper Nubia lay south of the Third Cataract. History Archaeological evidence attests to long histories of fishing-hunting-gathering, and later herding, throughout the Nile Valley. Affad 23 is an archaeological site located in the Affad region of southern Dongola Reach in northern Sudan, which hosts "the well-preserved remains of prehistoric camps (relics of the oldest open-air hut in the world) and diverse hunting and gathering loci some 50,000 years old". In southern Nubia (near modern Khartoum) from the ninth to the sixth millennia cal BC, Khartoum Mesolithic fisher-hunter-gatherers produced sophisticated pottery. By 5000 BC, the people who inhabited what is now called Nubia participated in the Neolithic Revolution. The Sahara became drier and people began to domesticate sheep, goats, and cattle. Saharan rock reliefs depict scenes that have been thought to suggest the presence of a cattle cult, typical of those seen throughout parts of Eastern Africa and the Nile Valley even to this day. Nubian rock art depicts hunters using bows and arrows in the Neolithic period, which is a precursor to Nubian archer culture in later times. Megaliths discovered at Nabta Playa are early examples of what seems to be one of the world's first astronomical devices, predating Stonehenge by almost 2,000 years. This complexity as expressed by different levels of authority within the society there likely formed the basis for the structure of both the Neolithic society at Nabta and the Old Kingdom of Egypt. American anthropologist, Joseph Vogel wrote that: "The period when sub-Saharan Africa was most influential in Egypt was a time when neither Egypt, as we understand it culturally, nor the Sahara, as we understand it geographically, existed. Populations and cultures now found south of the desert roamed far to the north. The culture of Upper Egypt, which became dynastic Egyptian civilization, could fairly be called a Sudanese transplant." British Africanist Basil Davidson outlined that "The ancient Egyptians belonged, that is, not to any specific Egyptian region or Near Eastern heritage but to that wide community of peoples who lived between the Red Sea and the Atlantic Ocean, shared a common "Saharan-Sudanese culture", and drew their reinforcements from the same great source, even though, as time went by, they also absorbed a number of wanderers from the Near East". Biological anthropologists Shomarka Keita and A.J. Boyce have stated that the "Studies of crania from southern predynastic Egypt, from the formative period (4000-3100 B.C.), show them usually to be more similar to the crania of ancient Nubians, Kushites, Saharans, or modern groups from the Horn of Africa than to those of dynastic northern Egyptians or ancient or modern southern Europeans." Archaeological evidence has attested that population settlements occurred in Nubia as early as the Late Pleistocene era and from the 5th millennium BC onwards, whereas there is "no or scanty evidence" of human presence in the Egyptian Nile Valley during these periods, which may be due to problems in site preservation. Several scholars have argued that the African origins of the Egyptian civilization derived from pastoral communities which emerged in both the Egyptian and Sudanese regions of the Nile Valley in the fifth millennium BCE. Archaeologist Bruce Williams has advanced the view that Nubian elites participated with the early Egyptian rulers in the development of the pharaonic civilization. Williams also clarified in 1987 that his discovery of the Qutsul incense burner proposed no claim of a Nubian origin or genesis for the pharaonic monarchy but that excavations had shown Nubian linkages and contributions. He maintained that detailed, archaeological evidence had found cemeteries of tombs situated in Qustul, Nubia which were described to be vastly wealthier and greater in size than the Abydos tombs of the first dynastic rulers. Dietrich Wildung (2018) examined Eastern Saharan pottery styles and Sudanese stone sculptures and suggested these artefacts were transmitted across the Nile Valley and influenced the pre-dynastic Egyptian culture in the Neolithic period. The poorly known "pre-Kerma" culture existed in Upper (Southern) Nubia on a stretch of fertile farmland just south of the Third Cataract. Nubia has one of the oldest civilizations in the world. This history is often intertwined with Egypt to the north.: 16 Around 3500 BC, the second "Nubian" culture, termed the Early A-Group culture, arose in Lower Nubia. They were sedentary agriculturalists,: 6 traded with the Egyptians and exported gold. This trade is supported archaeologically by large amounts of Egyptian commodities deposited in the A-Group graves. The imports consisted of gold objects, copper tools, faience amulets and beads, seals, slate palettes, stone vessels, and a variety of pots. During this time, the Nubians began creating distinctive black topped, red pottery. The A-Group population have been described as ethnically "very similar" to the pre-dynastic Egyptians in physical characteristics. Around 3100 BC, the A-group transitioned from the Early to Classical phases. "Arguably royal burials are known only at Qustul and possibly Sayala.": 8 During this period, the wealth of A-group kings rivaled Egyptian kings. Royal A-group graves contained gold and richly decorated pottery.: 19 Some scholars believe Nubian A-Group rulers and early Egyptian pharaohs used related royal symbols; similarities in A-Group Nubia and Upper Egypt rock art support this position. Scholars from the University of Chicago Oriental Institute excavated at Qustul (near Abu Simbel in Sudan), in 1960–64, and found artifacts which incorporated images associated with Egyptian pharaohs. Archeologist Bruce Williams studied the artifacts and concluded that "Egypt and Nubia A-Group culture shared the same official culture", "participated in the most complex dynastic developments", and "Nubia and Egypt were both part of the great East African substratum". Williams also wrote that Qustul "could well have been the seat of Egypt's founding dynasty". David O'Connor wrote that the Qustul incense burner provides evidence that the A-group Nubian culture in Qustul marked the "pivotal change" from predynastic to dynastic "Egyptian monumental art". However, "most scholars do not agree with this hypothesis", as more recent finds in Egypt indicate that this iconography originated in Egypt instead of Nubia, and that the Qustul rulers adopted or emulated the symbols of Egyptian pharaohs. According to David Wengrow, the A-Group polity of the late 4th millenninum BCE is poorly understood since most of the archaeological remains are submerged underneath Lake Nasser. Frank Yurco also remarked that depictions of pharonic iconography such as the royal crowns, Horus falcons and victory scenes were concentrated in the Upper Egyptian Naqada culture and A-Group Nubia. He further elaborated that "Egyptian writing arose in Naqadan Upper Egypt and A-Group Nubia, and not in the Delta cultures, where the direct Western Asian contact was made, further vitiates the Mesopotamian-influence argument". The archaeological cemeteries at Qustul are no longer available for excavations since the flooding of Lake Nasser. The earliest representations of pharaonic iconography have been excavated from Nag el-Hamdulab in Aswan, the extreme southern region of Egypt which borders the Sudan, with an estimated dating range between 3200 and 3100 BC. Writing developed in Egypt around 3300 BC. In their writings, Egyptians referred to Nubia as "Ta-Seti", or "The Land of the Bow," as the Nubians were known to be expert archers. More recent and broader studies have determined that the distinct pottery styles, differing burial practices, different grave goods, and site distribution all indicate that the Naqada people and the Nubian A-Group people were from different cultures. Kathryn Bard states that "Naqada cultural burials contain very few Nubian craft goods, which suggests that while Egyptian goods were exported to Nubia and were buried in A-Group graves, A-Group goods were of little interest further north." According to anthropologist Jane Hill, there is no evidence that the pharaohs of the First Dynasty of Egypt buried at Abydos were of Nubian origin. However, several biological anthropological studies have shown the Badarian and Naqada people to be closely related to the Nubian and other, tropical African populations. Also, the proto-dynastic kings emerged from the Naqada region. In the view of Egyptian scholar and editor of UNESCO General History of Africa Volume II (1981), Gamal Mokhtar, Upper Egypt and Nubia held "similar ethnic composition" with comparable material culture. Mokhtar described a notable difference between the communities with Upper Egyptians having adopted a system of writing earlier due to the exigencies of the Nile Valley whilst their Nubian counterparts were more reticent due to their higher reliance on mobile, stock-raising as an expressed feature of their economy. A uniform culture of nomadic herders, called the Gash group, existed from 3000 to 1500 BC to the east and west of Nubia.: 8 In Lower Nubia, the A-group moved from the Classical to Terminal phase. At this time, kings at Qustul likely ruled all of Lower Nubia and demonstrated the political centralization of Nubian society.: 21 The A-Group culture came to an end sometime between 3100 and 2900 BC, when it was apparently destroyed by the First Dynasty rulers of Egypt. There are no records of settlement in Lower Nubia for the next 600 years. Old Kingdom Egyptian dynasties (4th to 6th) controlled uninhabited Lower Nubia and raided Upper Nubia. The pre-Kerma developed into the Middle phase Kerma group. Some A-group people (transitioning to C-group) settled the area and co-existed with the pre-Kerma group.: 25 Like other Nubian groups, the two groups made an abundance of red pottery with black tops, though each group made different shapes.: 29 Traces of the C-group in Upper Nubia vanish by 2000 BC and Kerma culture began to dominate Upper Nubia.: 25 The power of an independent Upper Nubia increased around 1700 BC and Upper Nubia dominated Lower Nubia.: 25 An Egyptian official, Harkhuf, mentions that Irtjet, Setjet, and Wawat all combined under a single ruler. By 1650 BC, Egyptian texts started to refer to only two kingdoms in Nubia: Kush and Shaat.: 32, 38 Kush was centered at Kerma and Shaat was centered on Sai island.: 38 Bonnet posits that Kush actually ruled all of Upper Nubia, since "royal" graves were much larger in Kush than Shaat and Egyptian texts other than the Execration lists only refer to Kush (and not Shaat).: 38–39 C-group Nubians resettled Lower Nubia by 2400 BC.: 25 As trade between Egypt and Nubia increased, so did wealth and stability. Nubia was divided into a series of small kingdoms. There is debate over whether the C-group people, who flourished from 2500 BC to 1500 BC, were another internal evolution or invaders. O'Connor states "a transition from A group into a later culture, the C-group, can be traced" and the C-group culture was typical of Lower Nubia from 2400 to 1650 BC.: 25 Although they lived in close proximity to each other, Nubians did not acculturate much to Egyptian culture. Notable exceptions include C-group Nubians during the 15th Dynasty, isolated Nubian communities in Egypt, and some bowmen communities.: 56 C-Group pottery is characterized by all-over incised geometric lines with white infill and impressed imitations of basketry. Lower Nubia was controlled by Egypt from 2000 to 1700 BC and Upper Nubia from 1700 to 1525 BC. From 2200 to 1700 BC, the Pan Grave culture appeared in Lower Nubia.: 20 Some of the people were likely the Medjay (mḏꜣ,) arriving from the desert east of the Nile river. One feature of Pan Grave culture was shallow grave burial. The Pan Grave and C-Group definitely interacted: Pan Grave pottery is characterized by more limited incised lines than the C-Group's and generally have interspersed undecorated spaces within the geometric schemes. In 2300 BC, Nubia was first mentioned in Old Kingdom Egyptian accounts of trade missions. The Egyptians referred to Lower Nubia as Wawat, Irtjet, and Setju, while they referred to Upper Nubia as Yam. Some authors believe that Irtjet and Setju could also have been in Upper Nubia.: 32 They referred to Nubians dwelling near the river as Nehasyu.: 26 From Aswan, the southern limit of Egyptian control at the time, Egyptians imported gold, incense, ebony, copper, ivory, and exotic animals from tropical Africa through Nubia. Relations between the Egyptians and Nubians showed peaceful cultural interchange, cooperation, and mixed marriages. Nubian bowmen that settled at Gebelein during the First Intermediate Period married Egyptian women, were buried in Egyptian style, and eventually could not be distinguished from Egyptians.: 56 Older scholarship noted that some Egyptian pharaohs may have had Nubian ancestry. Richard Loban expressed the view that Mentuhotep II of the 11th Dynasty "was quite possibly of Nubian origin" and cited historical evidence which mentioned that Amenemhet I, founder of the 12th Dynasty, "had a Ta Seti or Nubian mother". Dietrich Wildung has argued that Nubian features were common in Egyptian iconography since the pre-dynastic era and that several pharaohs such as Khufu and Mentuhotep II were represented with these Nubian features. Frank Yurco wrote that "Egyptian rulers of Nubian ancestry had become Egyptians culturally; as pharaohs, they exhibited typical Egyptian attitudes and adopted typical Egyptian policies". Yurco noted that some Middle Kingdom rulers, particularly some pharaohs of the Twelfth Dynasty had strong Nubian features, due to the origin of the dynasty in the Aswan region of southern Egypt. He also identified the pharaoh Sequenre Tao of the Seventeenth Dynasty, as having Nubian features. Many scholars in recent years have argued that the mother of Amenemhat I, founder of the Twelfth Dynasty was of Nubian origin. After a period of withdrawal, the Middle Kingdom of Egypt conquered Lower Nubia from 2000 to 1700 BC.: 8, 25 By 1900 BC, King Sesostris I began building a series of towns below the Second Cataract with heavy fortresses that had enclosures and drawbridges.: 19 Sesotris III relentlessly expanded his kingdom into Nubia (from 1866 to 1863 BC) and erected massive river forts including Buhen, Semna, Shalfak and Toshka at Uronarti to gain more control over the trade routes in Lower Nubia. They also provided direct access to trade with Upper Nubia, which was independent and increasingly powerful during this time. These Egyptian garrisons seemed to peacefully coexist with the local Nubian people, though they did not interact much with them. Medjay was the name given by ancient Egypt to nomadic desert dwellers from east of the Nile River. The term was used variously to describe a location, the Medjay people, or their role/job in the kingdom. They became part of the Egyptian military as scouts and minor workers before being incorporated into the Egyptian army.[citation needed] In the army, the Medjay served as garrison troops in Egyptian fortifications in Nubia and patrolled the deserts as a kind of gendarmerie, or elite paramilitary police force, to prevent their fellow Medjay tribespeople from further attacking Egyptian assets in the region. The Medjay were often used to protect valuable areas, especially royal and religious complexes. Although they are most notable for their protection of the royal palaces and tombs in Thebes and the surrounding areas, the Medjay were deployed throughout Upper and Lower Egypt; they were even used during Kamose's campaign against the Hyksos and became instrumental in turning the Egyptian state into a military power. After the First Intermediate Period of Egypt, the Medjay district was no longer mentioned in written records. From the Middle Kerma phase, the first Nubian kingdom to unify much of the region arose. The Classic Kerma culture, named for its royal capital at Kerma, was one of the earliest urban centers in the Nile region and oldest city in Africa outside of Egypt.: 50–51 The Kerma group spoke either languages of the Cushitic branch or, according to more recent research, Nilo-Saharan languages of the Eastern Sudanic branch. By 1650 BC (Classic Kerma phase), the kings of Kerma were powerful enough to organize the labor for monumental town walls and large mud brick structures, such as the Eastern and Western Deffufas (50 by 25 by 18 meters). They also had rich tombs with possessions for the afterlife and large human sacrifices. George Andrew Reisner excavated sites at the royal city of Kerma and found distinctive Nubian architecture, such as large pebble covered tombs (90 meters in diameter), a large circular dwelling, and a palace-like structure.: 41 Classic Kerma rulers employed "a good many Egyptians", according to the Egyptian Execration texts.: 57 Kerma culture was militaristic, as attested by many archers' burials and bronze daggers/swords found in their graves.: 31 Other signs of Nubia's military prowess are the frequent use of Nubians in Egypt's military and Egypt's need to construct numerous fortresses to defend their southern border from the Nubians.: 31 Despite assimilation, the Nubian elite remained rebellious during Egyptian occupation. There were numerous rebellions and "military conflict occurred almost under every reign until the 20th dynasty".: 102–103 At one point, Kerma came very close to conquering Egypt: Egypt suffered a serious defeat at the hands of the Kingdom of Kush. According to Davies, head of the joint British Museum and Egyptian archaeological team, the attack was so devastating that, if the Kerma forces had chosen to stay and occupy Egypt, they might have permanently eliminated the Egyptians and brought the nation to extinction. During Egypt's Second Intermediate period, the Kushites reached the height of their Bronze Age power and completely controlled southern trade with Egypt.: 41 They maintained diplomatic ties with the Thebans and Hyksos until the New Kingdom pharaohs brought all of Nubia under Egyptian rule from 1500 to 1070 BC.: 41 After 1070 BC, there were continued hostilities with Egypt, which led Nubians to concentrate in Upper Nubia.: 58 Within 200 years, a fully formed Kushite state, based at Napata, began to exert its influence on Upper (Southern) Egypt.: 58–59 When the Middle Kingdom Egyptians pulled out of the Napata region around 1700 BC, they left a lasting legacy that was merged with indigenous C-group customs. Egyptians remaining at the garrison towns started to merge with the C-group Nubians in Lower Nubia. The C-group quickly adopted Egyptian customs and culture, as attested by their graves, and lived together with the remaining Egyptians in garrison towns.: 41 After Upper Nubia annexed Lower Nubia around 1700 BC, the Kingdom of Kush began to control the area. At this point, C-group Nubians and Egyptians began to proclaim their allegiance to the Kushite King in their inscriptions.: 41 Egypt conquered Lower and Upper Nubia from 1500 to 1070 BC. However, the Kingdom of Kush survived longer than Egypt. After the Theban 17th Dynasty New Kingdom of Egypt (c. 1532–1070 BC) expelled the Canaanite Hyksos from Egypt, they turned their imperial ambitions to Nubia. By the end of Thutmose I's reign (1520 BC), all of Lower Nubia had been annexed. After a long campaign, Egypt also conquered the Kingdom of Kerma in Upper Nubia and held both areas until 1070 BC.: 101–102 : 25 The Egyptian empire expanded into the Fourth Cataract, and a new administrative center was built at Napata, which became a gold and incense production area. Egypt became a prime source of gold in the Middle East. The primitive working conditions for the slaves are recorded by Diodorus Siculus. One of the oldest maps known is of a gold mine in Nubia: the Turin Papyrus Map dating to about 1160 BC; it is also one of the earliest characterized road maps in existence. Nubians were an integral part of New Kingdom Egyptian society. Some scholars state that Nubians were included in the 18th Dynasty of Egypt's royal family. Ahmose-Nefertari, "arguably the most venerated woman in Egyptian history", was thought by some scholars such as Flinders Petrie to be of Nubian origin because she is most often depicted with black skin.: 17 The mummy of Ahmose-Nefertari's father, Seqenenre Tao, has been described as presenting "tightly curled, woolly hair", with "a slight build and strongly Nubian features". Some modern scholars also believe that in some depictions, her skin color is indicative of her role as a goddess of resurrection, since black is both the color of the fertile land of Egypt and that of the underworld.: 90 : 125 However, there is no known depiction of her painted during her lifetime (she is represented with the same light skin as other represented individuals in tomb TT15, before her deification); the earliest black skin depiction appears in tomb TT161, c. 150 years after her death.: 11–12, 23, 74–5 : 125 Egyptologist Barbara Lesko wrote in 1996 that Ahmose-Nefertari was "sometimes portrayed by later generations as having been black, although her coffin portrait gives her the typical light yellow skin of women." In 2009, Egyptologist Elena Vassilika, noting that in a wooden statuette of the queen (now at the Museo Egizio) the face is painted black but the arms and feet are light in color, argued that the reason for the black coloring in that case was religious and not genetic.: 78–9 In 1098–1088 BC, Thebes was "the scene of a civil war-like conflict between the High Priest of Amun of Thebes Amenhotep and the Viceroy of Kush Panehesy (= the Nubian)". It was chaotic and many tombs were plundered. Instead of sending soldiers to restore order, Ramesses XI put Panehesy in control of that area's military and appointed him Director of Granaries. Panehesy stationed his troops in Thebes to protect the city from thieves, but it resembled a military occupation of Thebes to the High Priest, which later led to the Civil war in Thebes.: 104–105 By 1082 BC, Ramesses XI finally sent help to the High Priest. Panehesy continued his revolt and the city of Thebes suffered from "war, famine, and plunderings".: 106 Panehesy initially succeeded and the High Priest fled Thebes. Panehesy pursued the High Priest as far as Middle Egypt before Egyptian forces pushed Panehesy and his troops out of Egypt and into Lower Nubia.: 106 Ramesses sent new leadership to Thebes: Herihor was named the new High Priest of Thebes (and effectively King of Southern Egypt) and Paiankh was named the new Viceroy of Kush. Paiankh recaptured former Egyptian holdings in Lower Nubia as far as the second Nile cataract, but could not defeat Panehesy in Lower Nubia, who ruled the area until his death.: 106 Herihor's descendants became rulers of Egypt's 21st and 22nd Dynasties. There are competing theories on the origins of the Kushite kings of the 25th Dynasty: some scholars believe they were Nubian officials that learned "state level organization" by administering Egyptian-held Nubia from 1500 to 1070 BC,: 59 such as the rebel Viceroy of Kush, Panehesy, who ruled Upper Nubia and some of Lower Nubia after Egyptian forces withdrew.: 110 Other scholars believe they are descended from families of the Egyptianized Nubian elite supported by Egyptian priests or settlers. Children of elite Nubian families were sent to be educated in Egypt then returned to Kush to be appointed in bureaucratic positions to ensure their loyalty. During the Egyptian occupation of Nubia, there were temple towns with Egyptian cults, but "production and redistribution" was based mostly on indigenous social structures.: 111 The El Kurru chiefdom likely played a major role in the development of the Kingdom of Kush due to its access to gold producing areas, control of caravan routes,: 112 more arable land, and participation in international trade.: 121 "There can be no doubt that el-Kurru was the burial place of the ancestors of the Twenty-Fifth Dynasty.": 112 The early el-Kurru burials resemble Nubian Kerma/C-group traditions (contracted body, circular stone structures, burial on a bed).: 121 However, by 880–815 BC, Nubian burials at el-Kurru became more Egyptian in style with "mastabas, or pyramid on mastabas, chapels, and rectangular enclosures".: 117, 121–122 Alara, the first el-Kurru prince, and his successor, Kashta, were buried at el-Kurru.: 123 Later documents mention Alara as the 25th Dynasty's founder and "central to a myth of the origins of the kingdom".: 124–126 Alara's sister was the priestess of Amun, which created a system of royal secession and an "ideology of royal power in which Kushite concepts and practice were united with contemporary Egyptian concepts of kingship".: 144 Later, Kashta's daughter, the Kushite princess Amenirdis, was installed as God's Wife of Amun Elect and later Divine Adoratrice (effectively governor of Upper Egypt), which signaled the Kushite conquest of Egyptian territories.: 148 The Napatan Empire ushered in the age of Egyptian archaism, or a return to a historical past, which was embodied by a concentrated effort at religious renewal and restoration of Egypt's holy places.: 169 Piye expanded the Temple of Amun at Jebel Barkal by adding "an immense colonnaded forecourt".: 163–164 Shabaka restored the great Egyptian monuments and temples, "unlike his Libyan predecessors".: 167–169 Taharqa enriched Thebes on a monumental scale." At Karnak, the Sacred Lake structures, the kiosk in the first court, and the colonnades at the temple entrance are all built by Taharqa and Mentuemhet. In addition to architecture, the Kingdom of Kush was deeply influenced by Egyptian culture. By 780 BC, Amun was the main god of Kush and "intense contacts with Thebes" were maintained.: 144 Kush used the methods of Egyptian art and writing. The Nubian elite adopted many Egyptian customs and gave their children Egyptian names. Although some Nubian customs and beliefs (e.g. burial practices) continued to be practiced,: 111 Egyptianization dominated in ideas, practices, and iconography. The cultural Egyptianization of Nubia was at its highest levels at the times of both Kashta and Piye. Kashta peacefully became King of Upper and Lower Egypt with his daughter Amendiris as Divine Adoratrice of Amun in Thebes.: 144–146 Rulers of the 23rd Dynasty withdrew from Thebes to Heracleopolis, which avoided conflict with the new Kushite rulers of Thebes. Under Kashta's reign, the Kushite elite and professional classes became significantly Egyptianized. The city-state of Napata was the spiritual capital of Kush and it was from there that Piye (spelled Piankhi or Piankhy in older works) invaded and took control of Egypt. Piye personally led the attack on Egypt and recorded his victory in a lengthy hieroglyphic filled stele called the "Stele of Victory".: 166 Piye's success in achieving the double kingship after generations of Kushite planning resulted from "Kushite ambition, political skill, and the Theban decision to reunify Egypt in this particular way", and not Egypt's utter exhaustion, "as frequently suggested in Egyptological studies." Due to archaism, Piye mostly used the royal titulary of Tuthmosis III, but changed the Horus name from "Strong bull appearing (crowned) in Thebes" to "Strong bull appearing in Napata" to announce that the Kushites had reversed history and conquered their former Thebaid Egyptian conquerors.: 154 He also revived one of the greatest features of the Old and Middle Kingdoms: pyramid construction. As an energetic builder, he constructed the oldest known pyramid at the royal burial site of El-Kurru. According to the revised chronology, Shebitku "brought the entire Nile Valley as far as the Delta under the empire of Kush and is 'reputed' to have had Bocchoris, dynast of Sais, burnt to death".: 166–167 Shabaka "transferred the capital to Memphis".: 166 Shebitku's successor, Taharqa, was crowned in Memphis in 690 BC and ruled Upper and Lower Egypt as Pharaoh from Tanis in the Delta. Excavations at el-Kurru and studies of horse skeletons indicate the finest horses used in Kushite and Assyrian warfare were bred in and exported from Nubia. Horses and chariots were key to the Kushite war machine.: 157–158 Taharqa's reign was a prosperous time in the empire with a particularly large Nile river flood and abundant crops and wine. Taharqa's inscriptions indicate that he gave large amounts of gold to the temple of Amun at Kawa. His army undertook successful military campaigns, as attested by the "list of conquered Asiatic principalities" from the Mut temple at Karnak and "conquered peoples and countries (Libyans, Shasu nomads, Phoenicians?, Khor in Palestine)" from Sanam temple inscriptions. László Török mentions the military success was due to Taharqa's efforts to strengthen the army through daily training in long-distance running and Assyria's preoccupation with Babylon and Elam. Taharqa also built military settlements at the Semna and Buhen forts and the fortified site of Qasr Ibrim. Imperial ambitions of the Mesopotamian-based Assyrian Empire made war with the 25th Dynasty inevitable. Taharqa conspired with Levantine kingdoms against Assyria: in 701 BC, Taharqa and his army aided Judah and King Hezekiah in withstanding a siege by King Sennacherib of the Assyrians (2 Kings 19:9; Isaiah 37:9). There are various theories (Taharqa's army, disease, divine intervention, Hezekiah's surrender, Herodotus' mice theory) as to why the Assyrians failed to take Jerusalem and withdrew to Assyria. Sennacherib's annals record Judah was forced into tribute after the siege and Sennacherib became the ruler of the region. However, this is contradicted by Khor's frequent utilization of an Egyptian system of weights for trade and the twenty-year cessation in Assyria's pattern of repeatedly invading Khor (as Assyrians had before 701 and after Sennacherib's death). In 681 BC, Sennacherib was murdered by his own sons in Babylon. In 679 BC, Sennacherib's successor, King Esarhaddon, campaigned in Khor, destroyed Sidon, and forced Tyre into tribute in 677–676 BC. Esarhaddon invaded Egypt proper in 674 BC, but according to Babylonian records, Taharqa and his army outright defeated the Assyrians. In 672 BC, Taharqa brought reserve troops from Kush, as mentioned in rock inscriptions. Taharqa's Egypt still had influence in Khor during this period as Tyre's King Ba'lu "put his trust upon his friend Taharqa". Further evidence was Ashkelon's alliance with Egypt and Esarhaddon's inscription asking "if the Kushite-Egyptian forces 'plan and strive to wage war in any way' and if the Egyptian forces will defeat Esarhaddon at Ashkelon". However, Taharqa was defeated in Egypt in 671 BC when Esarhaddon conquered Northern Egypt, captured Memphis, and imposed tribute before withdrawing. Pharaoh Taharqa escaped to the south, but Esarhaddon captured the Pharaoh's family, including "Prince Nes-Anhuret and the royal wives", and sent them to Assyria. In 669 BC, Taharqa reoccupied Memphis and the Delta, and recommenced intrigues with the king of Tyre. Esarhaddon led his army to Egypt again and, after his death in 668 BC, command passed to Ashurbanipal. Ashurbanipal and the Assyrians defeated Taharqa again and advanced as far south as Thebes, but direct Assyrian control was not established. The rebellion was stopped and Ashurbanipal appointed Necho I, who had been king of the city Sais, as his vassal ruler in Egypt. Necho's son, Psamtik I, was educated at the Assyrian capital of Nineveh during Esarhaddon's reign.[citation needed] As late as 665 BC, the vassal rulers of Sais, Mendes, and Pelusium were still making overtures[a] to Taharqa in Kush. The vassals' plot was uncovered by Ashurbanipal and all rebels but Necho of Sais were executed. Taharqa's successor, Tantamani, sailed north from Napata with a large army to Thebes, where he was "ritually installed as the king of Egypt".: 185 From Thebes, Tantamani began his reconquest and regained control of Egypt as far north as Memphis.: 185 Tantamani's dream stele states that he restored order from the chaos, where royal temples and cults were not being maintained.: 185 After conquering Sais and killing Assyria's vassal, Necho I, in Memphis, "some local dynasts formally surrendered, while others withdrew to their fortresses".: 185 The Kushites had influence over their northern neighbors for nearly 100 years until they were repelled by the invading Assyrians. The Assyrians installed the native 26th Dynasty of Egypt under Psamtik I and they permanently forced the Kushites out of Egypt around 590 BC.: 121–122 The heirs of the Kushite empire established their new capital at Napata, which was also sacked by the Egyptians in 592 BC. The Kushite kingdom survived for another 900 years after being pushed south to Meroë. The Egyptianized culture of Nubia grew increasingly Africanized after the fall of the 25th Dynasty until Queen Amanishakhete acceded in 45 BC.[citation needed] She temporarily arrested the loss of Egyptian culture, but then it continued unchecked. Due to pressure from Assyrians and Egyptians, Meroë (800 BC – c. 350 AD) became the southern capital of the Kingdom of Kush. According to partially deciphered Meroitic texts, the name of the city was Medewi or Bedewi. Meroë was in southern Nubia by the east bank of the Nile, about 6 km north-east of the Kabushiya station near Shendi, Sudan, and about 200 km northeast of Khartoum. Meroë is mentioned in first-century AD Periplus of the Erythraean Sea: "farther inland, in the country towards the west, there lies a city called Meroe". In fifth-century BC, Greek historian Herodotus described it as "a great city...said to be the mother city of the other Ethiopians." Together, Musawwarat es-Sufra, Naqa, and Meroë formed the Island of Meroe. The town's importance gradually increased from the beginning of the Meroitic Period, especially from the reign of Arakamani (c. 280 BC) when the royal burial ground was transferred to Meroë from Napata (Jebel Barkal). Excavations revealed evidence of important, high ranking Kushite burials, from the Napatan Period (c. 800 – c. 280 BC) in the vicinity of the settlement called the Western cemetery. They buried their kings in small pyramids with steeply sloped sides that were based on New Kingdom Viceroy designs. At its peak, the rulers of Meroë controlled the Nile Valley over a north–south straight-line distance of more than 1,000 km (620 mi). People of the Meroitic period preserved many ancient Egyptian customs but were unique in many respects. The Meroitic language was spoken in Meroë and Sudan during the Meroitic period (attested from 300 BC) before becoming extinct around 400 AD. They developed their own form of writing by using Egyptian hieroglyphs before switching to a cursive alphabetic script with 23 signs. It was split into two types: Meroitic Cursive, which was written with a stylus and used for general record-keeping; and Meroitic Hieroglyphic, which was carved in stone or used for royal or religious documents. It is not well understood due to the scarcity of bilingual texts.[clarification needed] The earliest inscription in Meroitic writing dates from between 180 and 170 BC. These hieroglyphics were found engraved on the temple of Queen Shanakdakhete. Meroitic Cursive is written horizontally, and is read from right to left like all Semitic orthographies. The Meroitic people worshiped the Egyptian gods as well as their own, such as Apedemak and the lion-son of Sekhmet (or Bast). Meroë was the base of a flourishing kingdom whose wealth was centered around a strong iron industry and international trade with India and China. Metalworking is believed to have happened in Meroë, possibly through bloomeries and blast furnaces. The centralized control of production within the Meroitic empire and distribution of certain crafts and manufactures may have been politically important. Other important sites were Musawwarat es-Sufra and Naqa. Musawwarat es-Sufra, which is now a UNESCO World Heritage Site, was constructed in sandstone. Its main features were the Great Enclosure, the Lion Temple of Apedemak (14×9×5 meters), and the Great Reservoir. The Great Enclosure is the main structure of the site. Much of the large labyrinth-like building complex, which covers approximately 45,000 m2, was erected in third-century BC. The scheme of the site is, so far, without parallel in Nubia and ancient Egypt. According to Hintze, "the complicated ground plan of this extensive complex of buildings is without parallel in the entire Nile valley". The maze of courtyards includes three (possible) temples, passages, low walls that prevent any contact with the outside world, about 20 columns, ramps and two reservoirs. There is some debate about the purpose of the buildings, with earlier suggestions including a college, a hospital, and an elephant-training camp. The Lion Temple was constructed by Arnekhamani and bears inscriptions in Egyptian hieroglyphs, representations of elephants and lions on the rear inside wall, and reliefs of Apedemak depicted as a three-headed god on the outside walls. The Great Reservoir is a hafir to retain as much as possible of the rainfall of the short, wet season. It is 250 m in diameter and 6.3 m deep. Kandake, often Latinised as Candace, was the Meroitic term for the sister of the king of Kush who, due to matrilineal succession, would bear the next heir, making her a queen mother. According to scholar Basil Davidson, at least four Kushite queens — Amanirenas, Amanishakheto, Nawidemak and Amanitore — probably spent part of their lives in Musawwarat es-Sufra. Pliny writes that the "Queen of the Ethiopians" bore the title Candace, and indicates that the Ethiopians had conquered ancient Syria and the Mediterranean. In 25 BC the Kush kandake Amanirenas, as reported by Strabo, attacked the city of Syene (known as Aswan today) within the territory of the Roman Empire; Emperor Augustus destroyed the city of Napata in retaliation. In the New Testament biblical account, a treasury official of "Candace, queen of the Ethiopians", returning from a trip to Jerusalem, met with Philip the Evangelist and was baptized. Herodotus mentioned an invasion of Kush by the Achaemenid ruler Cambyses II, however, he mentions that "his expedition failed miserably in the desert".: 65–66 Derek Welsby states "scholars have doubted that this Persian expedition ever took place, but... archaeological evidence suggests that the fortress of Dorginarti near the second cataract served as Persia's southern boundary.": 65–66 Ultimately, the Achaemenids under either Cambyses (c. 530 BC) or Darius I (550–486 BC) were successful in occupying the Kushan kingdom, and Darius describes the fealty of Kush (Kušiya) in his inscriptions. The Greek Ptolemaic Kingdom under Ptolemy II Philadelphus invaded Nubia in 275 BC and annexed the northern twelve miles of this territory, subsequently known as the Dodekaschoinos ('twelve-mile land'). Throughout the 160s and 150s BC, Ptolemy VI also reasserted Ptolemaic control over the northern part of Nubia. There is no record of conflict between the Kushites and Ptolemies. However, there was a serious revolt at the end of Ptolemy IV's reign and the Kushites likely tried to interfere in Ptolemaic affairs.: 67 It is suggested that this led to Ptolemy V defacing the name of Arqamani on inscriptions at Philae.: 67 "Arqamani constructed a small entrance hall to the temple built by Ptolemy IV at Pselchis and constructed a temple at Philae to which Ptolemy contributed an entrance hall.": 66 There is evidence of Ptolemaic occupation as far south as the Second Cataract, but recent finds at Qasr Ibrim, such as "the total absence of Ptolemaic pottery", have cast doubts on the effectiveness of the occupation.: 67 Dynastic struggles led to the Ptolemies abandoning the area, so "the Kushites reasserted their control...with Qasr Ibrim occupied" (by the Kushites) and other locations perhaps garrisoned.: 67 According to Welsby, after the Romans assumed control of Egypt, they negotiated with the Kushites at Philae and drew the southern border of Roman Egypt at Aswan.: 67 Theodore Mommsen and Welsby state the Kingdom of Kush became a client Kingdom, which was similar to the situation under Ptolemaic rule of Egypt. Kushite ambition and excessive Roman taxation are two theories for a revolt supported by Kushite armies.: 67–68 The ancient historians, Strabo and Pliny, give accounts of the conflict with Roman Egypt. Strabo describes a war with the Romans in the first century BC. He stated that the Kushites "sacked Aswan with an army of 30,000 men and destroyed imperial statues...at Philae.": 68 A "fine over-life-size bronze head of the emperor Augustus" was found buried in Meroë in front of a temple.: 68 After the initial victories of Kandake (or "Candace") Amanirenas against Roman Egypt, the Kushites were defeated and Napata was sacked. Napata's fall was not a crippling blow to the Kushites and did not frighten Amanirenas enough to prevent her from again engaging in combat with the Roman military. In 22 BC, a large Kushite force moved northward with the intention of attacking Qasr Ibrim. Alerted to the advance, Petronius again marched south and managed to reach Qasr Ibrim and bolster its defences before the invading Kushites arrived. Welsby states that after a Kushite attack on Primis (Qasr Ibrim),: 69–70 the Kushites sent ambassadors to negotiate a peace settlement with Petronius, which succeeded on favourable terms. Trade between the two nations increased and the Roman-Egyptian border was extended to "Hiera Sykaminos (Maharraqa).": 149 : 70 This arrangement "guaranteed peace for most of the next 300 years" and there is "no definite evidence of further clashes.": 70 During this time, different parts of the region divided into smaller groups with individual leaders (or generals), each commanding small armies of mercenaries. They fought for control of what is now Nubia and its surrounding territories, leaving the entire region weak and vulnerable to attack. Meroë would eventually be defeated by the new rising Kingdom of Aksum to the south, ruled by King Ezana. A stele in Ge'ez of an unnamed ruler of Aksum thought to be Ezana was found at the site of Meroë. From the description in Greek, he was "King of the Aksumites and the Omerites" (i.e., King of Aksum and Himyar). It is likely this king ruled sometime around 330 AD. While some authorities interpret these inscriptions as proof that the Axumites destroyed the kingdom of Meroë, others note that archeological evidence points to an economic and political decline in Meroë around 300 AD. Moreover, some view the stele as military aid from Aksum to Meroë to quell the revolt and rebellion. From that point on, the Romans referred to the area as Nobatia. Around 350 AD, the area was invaded by the Kingdom of Aksum and the Meroitic kingdom collapsed. Three smaller Christian kingdoms replaced it: the northernmost was Nobatia (capital Pachoras; now modern-day Faras, Egypt) between the first and second cataract of the Nile River; in the middle was Makuria (capital Old Dongola), and southernmost was Alodia (capital Soba). King Silky of Nobatia defeated the Blemmyes and recorded his victory in a Greek language inscription carved in the wall of the temple of Talmis (modern Kalabsha) around 500 AD. Christianity had been introduced to the region by the fourth century: Bishop Athanasius of Alexandria consecrated Marcus as bishop of Philae before his death in 373 AD. John of Ephesus records that a Miaphysite priest named Julian converted the king and his nobles of Nobatia around 545 AD. He also writes that the kingdom of Alodia was converted around 569. However, John of Biclarum wrote that the kingdom of Makuria converted to Catholicism the same year, suggesting that John of Ephesus might be mistaken. Further doubt is cast on John's[clarification needed] testimony by an entry in the chronicle of the Greek Orthodox Patriarch of Alexandria Eutychius of Alexandria, which states that in 719 AD the church of Nubia transferred its allegiance from the Greek to the Coptic Orthodox Church. After the official Christianization of Nubia, the Isis cult of Philae remained for the sake of the Nubians [citation needed]. The edict of Theodosius I (390 AD) was not enforced at Philae. Later attempts to suppress the cult of Isis led to armed clashes between the Nubians and Romans. Finally, in 453 AD, a treaty recognizing the traditional religious rights of Nubians at Philae was signed. By the seventh century, Makuria expanded and became the dominant power in the region. It was strong enough to halt the southern expansion of Islam after the Arabs had taken Egypt. After several failed invasions the new Muslim rulers agreed to a treaty with Dongola, called Baqt, to allow peaceful coexistence and trade, contingent on the Nubians making an annual payment consisting of slaves and other tributes to the Islamic Governor at Aswan; it guaranteed that any runaway slaves were returned to Nubia. The treaty was kept for six hundred years. Throughout this period, Nubia's main exports were dates and slaves, though ivory and gold were also exchanged for Egyptian ceramics, textiles, and glass. Over time the influx of Arab traders introduced Islam to Nubia and it gradually supplanted Christianity. After an interruption in the annual tribute of slaves, the Egyptian Mamluk ruler invaded in 1272 and declared himself sovereign over half of Nubia. While there are records of a bishop Timothy at Qasr Ibrim in 1372, his see included Faras. It is also clear that the cathedral of Dongola had been converted to a mosque in 1317. The influx of Arabs and Nubians to Egypt and Sudan had contributed to the suppression of the Nubian identity following the collapse of the last Nubian kingdom around 1504. A vast majority of the Nubian population is currently Muslim, and the Arabic language is their main medium of communication in addition to their indigenous Nubian language. The unique characteristic of Nubian is shown in their culture (dress, dances, traditions, and music). In the fourteenth century, the Dongolan government collapsed and the region was divided and dominated by Arabs. Several Arab invasions into the region and the establishment of smaller kingdoms occurred over the next few centuries. Northern Nubia was brought under Egyptian control, while the south was controlled by the Kingdom of Sennar in the sixteenth century. The entire region came under Egyptian control during Muhammad Ali's rule in the early nineteenth century, and later became a joint Anglo-Egyptian condominium. 21st-century archaeology The paleo-demography of Nubians from the Upper Paleolithic to late 16th century BC were analyzed by Aleksandra Pudlo. Mesolithic period inhabitants were characterized as robust and tall, with strong alveolar prognathism. During the Neolithic, Nubians were less robust and shorter, retaining some prognathism, but having facial shape changes and a narrower nasal index. Over a period of 8,500 years, the features had shifted a considerable degree. The variety of morphological forms which occurred was considered a result of the combination of two distinct traits, with Pudlo concluding: "Nubians were hardly a homogeneous population. Neither the climate nor the specific geographic conditions in the region they inhabited were conducive of such homogeneity." The populations were possibly influenced by migration waves coming from the north, but these movements did not prevent repeated contacts of the people of Nubia with other regions further south in Africa. Findings were recorded in 2016 on Nubian remains over a period of 11,000 years: "Taken together, our results suggest a dramatic shift in cranial morphology between the Mesolithic and the A-group cultural group, with little perceptible change in cranial shape between A-group and the later farming groups. In the case of the mandible, we observe the largest morphological change between the Mesolithic and the A-group, but also see morphological differentiation between the early farmers (A and C-group) and the later farming groups (Pharaonic and Meroitic specimens)." Changes were attributed to factors such as in situ adaptation or influxes of people, as well as migration of farmers. Nonetheless, authors concluded further studies with larger samples and a combination of morphometric analyses and ancient DNA are needed. In 2003, archaeologist Charles Bonnet led a team of Swiss archaeologists to excavate near Kerma and discovered a cache of monumental black granite statues of the Pharaohs of the 25th Dynasty of Egypt, now displayed at the Kerma Museum. Among the sculptures are ones belonging to the dynasty's last two pharaohs, Taharqa and Tanoutamon, whose statues are described as "masterpieces that rank among the greatest in art history". Craniometric analysis of Kerma fossils that compared them to various other early populations inhabiting the Nile Valley and Maghreb found that they were morphologically close to Predynastic Egyptians from Naqada (4000–3200 BC). Dental trait analysis of Kerma fossils found affinities with various populations inhabiting the Nile Valley, Horn of Africa, and Northeast Africa, especially to other ancient populations from the central and northern Sudan. Among the sampled populations, the Kerma people were overall nearest to the Kush populations in Upper Nubia, the A-Group culture bearers of Lower Nubia, and Ethiopians. Contemporary issues Nubia was divided between Egypt and Sudan after colonialism ended and the Republic of Egypt was established in 1953, and the Republic of Sudan seceded from Egypt in 1956. In the early-1970s, many Egyptian and Sudanese Nubians were forcibly relocated to make room for Lake Nasser after dams were constructed at Aswan. Nubian villages can be found north of Aswan on the west bank of the Nile and on Elephantine Island. Many Nubians now live in large cities like Cairo and Khartoum. Ancient DNA In 2014, a male infant skeleton was recovered during an excavation in what is present-day Wadi Halfa from the Christian Period (500-1400 AD), located near the Second Cataract of the Nile in the Republic of the Sudan. The results from the Principal component analysis (PCA) had the individual placed between African and European clusters. Furthermore, the individual was assigned to mitochondrial haplogroup L5a1a, a branch of the ancient L5 haplogroup with origins in East Africa. Another analysis in 2015 studied a Nubian individual from an archeological site in Kulubnarti. The geographic ancestry of the individual was estimated to be closer to Middle Eastern, and Central and South Asians, rather than to any African populations. Sirak et al. 2021 obtained and analyzed the whole genomes of 66 individuals from the site of Kulubnarti situated in northern Nubia between the 2nd and 3rd cataract, near the modern Egyptian border, and dated to the Christian period between 650 and 1000 AD. The samples were obtained from two cemeteries. The samples' genetic profile was found to be a mixture between West Eurasian and Sub Saharan Dinka-related ancestries, with ~60% West Eurasian related ancestry that likely came from ancient Egyptians but ultimately resembles that found in Bronze or Iron Age Levantines, and ~40% Dinka-related ancestry. The two cemeteries showed minimal differences in their West Eurasian/Dinka ancestry proportions. These findings in addition to multiple cross cemetery relatives that the analyses have revealed indicate that people of both the R and S cemeteries were part of the same population despite the archaeological and anthropological differences between the two burials showing social stratification. Modern Nubians, despite their superficial resemblance to the Kulubnarti Nubians on the PCA, were not found to be descended from Kulubnarti Nubians without additional later admixtures. Modern Nubians were found to have an increase in Sub-Saharan ancestry along with a change in their west Eurasian ancestry from that which was found in the ancient samples. A sample from historic Lower Nubia, in the Nubian site of Sayala during the 3rd-6th century AD, belonged to mtDNA haplogroup J1c. In 2022, DNA was sequenced from the hair of a Kerma period individual (4000 BP), and the results revealed close genetic affinity to early pastoralists from the Rift Valley in eastern Africa during the Pastoral Neolithic, who harbored approximately 40% West Eurasian ancestry derived from the Levant Chalcolithic population. This result is consistent with the movement of herding populations southwards along the Nile River Valley following their establishment in the Kadruka region from the early 5th millennium BC. Nubian Images See also Notes Further reading Notes External links Media related to Nubia at Wikimedia Commons |
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[SOURCE: https://en.wikipedia.org/wiki/Special:BookSources/978-0-13-233553-9] | [TOKENS: 380] |
Contents Book sources This page allows users to search multiple sources for a book given a 10- or 13-digit International Standard Book Number. Spaces and dashes in the ISBN do not matter. This page links to catalogs of libraries, booksellers, and other book sources where you will be able to search for the book by its International Standard Book Number (ISBN). Online text Google Books and other retail sources below may be helpful if you want to verify citations in Wikipedia articles, because they often let you search an online version of the book for specific words or phrases, or you can browse through the book (although for copyright reasons the entire book is usually not available). At the Open Library (part of the Internet Archive) you can borrow and read entire books online. Online databases Subscription eBook databases Libraries Alabama Alaska California Colorado Connecticut Delaware Florida Georgia Illinois Indiana Iowa Kansas Kentucky Massachusetts Michigan Minnesota Missouri Nebraska New Jersey New Mexico New York North Carolina Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Washington state Wisconsin Bookselling and swapping Find your book on a site that compiles results from other online sites: These sites allow you to search the catalogs of many individual booksellers: Non-English book sources If the book you are looking for is in a language other than English, you might find it helpful to look at the equivalent pages on other Wikipedias, linked below – they are more likely to have sources appropriate for that language. Find other editions The WorldCat xISBN tool for finding other editions is no longer available. However, there is often a "view all editions" link on the results page from an ISBN search. Google books often lists other editions of a book and related books under the "about this book" link. You can convert between 10 and 13 digit ISBNs with these tools: Find on Wikipedia See also Get free access to research! Research tools and services Outreach Get involved |
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[SOURCE: https://en.wikipedia.org/wiki/Extraterrestrial_life#cite_ref-13] | [TOKENS: 11349] |
Contents Extraterrestrial life Extraterrestrial life, or alien life (colloquially aliens), is life that originates from another world rather than on Earth. No extraterrestrial life has yet been scientifically or conclusively detected. Such life might range from simple forms such as prokaryotes to intelligent beings, possibly bringing forth civilizations that might be far more, or far less, advanced than humans. The Drake equation speculates about the existence of sapient life elsewhere in the universe. The science of extraterrestrial life is known as astrobiology. Speculation about inhabited worlds beyond Earth dates back to antiquity. Early Christian writers, including Augustine, discussed ideas from thinkers like Democritus and Epicurus about countless worlds in the vast universe. Pre-modern writers typically assumed extraterrestrial "worlds" were inhabited by living beings. William Vorilong, in the 15th century, acknowledged the possibility Jesus could have visited extraterrestrial worlds to redeem their inhabitants.: 26 In 1440, Nicholas of Cusa suggested Earth is a "brilliant star"; he theorized that all celestial bodies, even the Sun, could host life. Descartes wrote that there were no means to prove the stars were not inhabited by "intelligent creatures", but their existence was a matter of speculation.: 67 In comparison to the life-abundant Earth, the vast majority of intrasolar and extrasolar planets and moons have harsh surface conditions and disparate atmospheric chemistry, or lack an atmosphere. However, there are many extreme and chemically harsh ecosystems on Earth that do support forms of life and are often hypothesized to be the origin of life on Earth. Examples include life surrounding hydrothermal vents, acidic hot springs, and volcanic lakes, as well as halophiles and the deep biosphere. Since the mid-20th century, researchers have searched for extraterrestrial life and intelligence. Solar system studies focus on Venus, Mars, Europa, and Titan, while exoplanet discoveries now total 6,022 confirmed planets in 4,490 systems as of October 2025. Depending on the category of search, methods range from analysis of telescope and specimen data to radios used to detect and transmit interstellar communication. Interstellar travel remains largely hypothetical, with only the Voyager 1 and Voyager 2 probes confirmed to have entered the interstellar medium. The concept of extraterrestrial life, especially intelligent life, has greatly influenced culture and fiction. A key debate centers on contacting extraterrestrial intelligence: some advocate active attempts, while others warn it could be risky, given human history of exploiting other societies. Context Initially, after the Big Bang, the universe was too hot to allow life. It is estimated that the temperature of the universe was around 10 billion Kelvin at the one-second mark. Roughly 15 million years later, it cooled to temperate levels, though the elements of organic life were yet nonexistent. The only freely available elements at that point were hydrogen and helium. Carbon and oxygen (and later, water) would not appear until 50 million years later, created through stellar fusion. At that point, the difficulty for life to appear was not the temperature, but the scarcity of free heavy elements. Planetary systems emerged, and the first organic compounds may have formed in the protoplanetary disk of dust grains that would eventually create rocky planets like Earth. Although Earth was in a molten state after its birth and may have burned any organics that fell on it, it would have been more receptive once it cooled down. Once the right conditions on Earth were met, life started by a chemical process known as abiogenesis. Alternatively, life may have formed less frequently, then spread—by meteoroids, for example—between habitable planets in a process called panspermia. During most of its stellar evolution, stars combine hydrogen nuclei to make helium nuclei by stellar fusion, and the comparatively lighter weight of helium allows the star to release the extra energy. The process continues until the star uses all of its available fuel, with the speed of consumption being related to the size of the star. During its last stages, stars start combining helium nuclei to form carbon nuclei. The larger stars can further combine carbon nuclei to create oxygen and silicon, oxygen into neon and sulfur, and so on until iron. Ultimately, the star blows much of its content back into the stellar medium, where it would join clouds that would eventually become new generations of stars and planets. Many of those materials are the raw components of life on Earth. As this process takes place in all the universe, said materials are ubiquitous in the cosmos and not a rarity from the Solar System. Earth is a planet in the Solar System, a planetary system formed by a star at the center, the Sun, and the objects that orbit it: other planets, moons, asteroids, and comets. The sun is part of the Milky Way, a galaxy. The Milky Way is part of the Local Group, a galaxy group that is in turn part of the Laniakea Supercluster. The universe is composed of all similar structures in existence. The immense distances between celestial objects are a difficulty for studying extraterrestrial life. So far, humans have only set foot on the Moon and sent robotic probes to other planets and moons in the Solar System. Although probes can withstand conditions that may be lethal to humans, the distances cause time delays: the New Horizons took nine years after launch to reach Pluto. No probe has ever reached extrasolar planetary systems. The Voyager 2 left the Solar System at a speed of 50,000 kilometers per hour; if it headed towards the Alpha Centauri system, the closest one to Earth at 4.4 light years, it would reach it in 100,000 years. Under current technology, such systems can only be studied by telescopes, which have limitations. It is estimated that dark matter has a larger amount of combined matter than stars and gas clouds, but as it plays no role in the stellar evolution of stars and planets, it is usually not taken into account by astrobiology. There is an area around a star, the circumstellar habitable zone or "Goldilocks zone", wherein water may be at the right temperature to exist in liquid form at a planetary surface. This area is neither too close to the star, where water would become steam, nor too far away, where water would be frozen as ice. However, although useful as an approximation, planetary habitability is complex and defined by several factors. Being in the habitable zone is not enough for a planet to be habitable, not even to actually have such liquid water. Venus is located in the solar system's habitable zone, but does not have liquid water because of the conditions of its atmosphere. Jovian planets or gas giants are not considered habitable even if they orbit close enough to their stars as hot Jupiters, due to crushing atmospheric pressures. The actual distances for the habitable zones vary according to the type of star, and even the solar activity of each specific star influences the local habitability. The type of star also defines the time the habitable zone will exist, as its presence and limits will change along with the star's stellar evolution. The Big Bang occurred 13.8 billion years ago, the Solar System was formed 4.6 billion years ago, and the first hominids appeared 6 million years ago. Life on other planets may have started, evolved, given birth to extraterrestrial intelligences, and perhaps even faced a planetary extinction event millions or billions of years ago. When considered from a cosmic perspective, the brief times of existence of Earth's species may suggest that extraterrestrial life may be equally fleeting under such a scale. During a period of about 7 million years, from about 10 to 17 million years after the Big Bang, the background temperature was between 373 and 273 K (100 and 0 °C; 212 and 32 °F), allowing the possibility of liquid water if any planets existed. Avi Loeb (2014) speculated that primitive life might in principle have appeared during this window, which he called "the Habitable Epoch of the Early Universe". Life on Earth is quite ubiquitous across the planet and has adapted over time to almost all the available environments in it, extremophiles and the deep biosphere thrive at even the most hostile ones. As a result, it is inferred that life in other celestial bodies may be equally adaptive. However, the origin of life is unrelated to its ease of adaptation and may have stricter requirements. A celestial body may not have any life on it, even if it were habitable. Likelihood of existence Life in the cosmos beyond Earth has been observed. The hypothesis of ubiquitous extraterrestrial life relies on three main ideas. The first one, the size of the universe, allows for plenty of planets to have a similar habitability to Earth, and the age of the universe gives enough time for a long process analog to the history of Earth to happen there. The second is that the substances that make life, such as carbon and water, are ubiquitous in the universe. The third is that the physical laws are universal, which means that the forces that would facilitate or prevent the existence of life would be the same ones as on Earth. According to this argument, made by scientists such as Carl Sagan and Stephen Hawking, it would be improbable for life not to exist somewhere else other than Earth. This argument is embodied in the Copernican principle, which states that Earth does not occupy a unique position in the Universe, and the mediocrity principle, which states that there is nothing special about life on Earth. Other authors consider instead that life in the cosmos, or at least multicellular life, may actually be rare. The Rare Earth hypothesis maintains that life on Earth is possible because of a series of factors that range from the location in the galaxy and the configuration of the Solar System to local characteristics of the planet, and that it is unlikely that another planet simultaneously meets all such requirements. The proponents of this hypothesis consider that very little evidence suggests the existence of extraterrestrial life and that, at this point, it is just a desired result and not a reasonable scientific explanation for any gathered data. In 1961, astronomer and astrophysicist Frank Drake devised the Drake equation as a way to stimulate scientific dialogue at a meeting on the search for extraterrestrial intelligence (SETI). The Drake equation is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. The Drake equation is:: xix where: and Drake's proposed estimates are as follows, but numbers on the right side of the equation are agreed as speculative and open to substitution: 10,000 = 5 ⋅ 0.5 ⋅ 2 ⋅ 1 ⋅ 0.2 ⋅ 1 ⋅ 10,000 {\displaystyle 10{,}000=5\cdot 0.5\cdot 2\cdot 1\cdot 0.2\cdot 1\cdot 10{,}000} [better source needed] The Drake equation has proved controversial since, although it is written as a math equation, none of its values were known at the time. Although some values may eventually be measured, others are based on social sciences and are not knowable by their very nature. This does not allow one to make noteworthy conclusions from the equation. Based on observations from the Hubble Space Telescope, there are nearly 2 trillion galaxies in the observable universe. It is estimated that at least ten percent of all Sun-like stars have a system of planets. In other words, there are 6.25×1018 stars with planets orbiting them in the observable universe. Even if it is assumed that only one out of a billion of these stars has planets supporting life, there would be some 6.25 billion life-supporting planetary systems in the observable universe. A 2013 study based on results from the Kepler spacecraft estimated that the Milky Way contains at least as many planets as it does stars, resulting in 100–400 billion exoplanets. The Nebular hypothesis that explains the formation of the Solar System and other planetary systems would suggest that those can have several configurations, and not all of them may have rocky planets within the habitable zone. The apparent contradiction between high estimates of the probability of the existence of extraterrestrial civilisations and the lack of evidence for such civilisations is known as the Fermi paradox. Dennis W. Sciama claimed that life's existence in the universe depends on various fundamental constants. Zhi-Wei Wang and Samuel L. Braunstein suggest that a random universe capable of supporting life is likely to be just barely able to do so, giving a potential explanation to the Fermi paradox. Biochemical basis If extraterrestrial life exists, it could range from simple microorganisms and multicellular organisms similar to animals or plants, to complex alien intelligences akin to humans. When scientists talk about extraterrestrial life, they consider all those types. Although it is possible that extraterrestrial life may have other configurations, scientists use the hierarchy of lifeforms from Earth for simplicity, as it is the only one known to exist. The first basic requirement for life is an environment with non-equilibrium thermodynamics, which means that the thermodynamic equilibrium must be broken by a source of energy. The traditional sources of energy in the cosmos are the stars, such as for life on Earth, which depends on the energy of the sun. However, there are other alternative energy sources, such as volcanoes, plate tectonics, and hydrothermal vents. There are ecosystems on Earth in deep areas of the ocean that do not receive sunlight, and take energy from black smokers instead. Magnetic fields and radioactivity have also been proposed as sources of energy, although they would be less efficient ones. Life on Earth requires water in a liquid state as a solvent in which biochemical reactions take place. It is highly unlikely that an abiogenesis process can start within a gaseous or solid medium: the atom speeds, either too fast or too slow, make it difficult for specific ones to meet and start chemical reactions. A liquid medium also allows the transport of nutrients and substances required for metabolism. Sufficient quantities of carbon and other elements, along with water, might enable the formation of living organisms on terrestrial planets with a chemical make-up and temperature range similar to that of Earth. Life based on ammonia rather than water has been suggested as an alternative, though this solvent appears less suitable than water. It is also conceivable that there are forms of life whose solvent is a liquid hydrocarbon, such as methane, ethane or propane. Another unknown aspect of potential extraterrestrial life would be the chemical elements that would compose it. Life on Earth is largely composed of carbon, but there could be other hypothetical types of biochemistry. A replacement for carbon would need to be able to create complex molecules, store information required for evolution, and be freely available in the medium. To create DNA, RNA, or a close analog, such an element should be able to bind its atoms with many others, creating complex and stable molecules. It should be able to create at least three covalent bonds: two for making long strings and at least a third to add new links and allow for diverse information. Only nine elements meet this requirement: boron, nitrogen, phosphorus, arsenic, antimony (three bonds), carbon, silicon, germanium and tin (four bonds). As for abundance, carbon, nitrogen, and silicon are the most abundant ones in the universe, far more than the others. On Earth's crust the most abundant of those elements is silicon, in the Hydrosphere it is carbon and in the atmosphere, it is carbon and nitrogen. Silicon, however, has disadvantages over carbon. The molecules formed with silicon atoms are less stable, and more vulnerable to acids, oxygen, and light. An ecosystem of silicon-based lifeforms would require very low temperatures, high atmospheric pressure, an atmosphere devoid of oxygen, and a solvent other than water. The low temperatures required would add an extra problem, the difficulty to kickstart a process of abiogenesis to create life in the first place. Norman Horowitz, head of the Jet Propulsion Laboratory bioscience section for the Mariner and Viking missions from 1965 to 1976 considered that the great versatility of the carbon atom makes it the element most likely to provide solutions, even exotic solutions, to the problems of survival of life on other planets. However, he also considered that the conditions found on Mars were incompatible with carbon based life. Even if extraterrestrial life is based on carbon and uses water as a solvent, like Earth life, it may still have a radically different biochemistry. Life is generally considered to be a product of natural selection. It has been proposed that to undergo natural selection a living entity must have the capacity to replicate itself, the capacity to avoid damage/decay, and the capacity to acquire and process resources in support of the first two capacities. Life on Earth may have started with an RNA world and later evolved to its current form, where some of the RNA tasks were transferred to DNA and proteins. Extraterrestrial life may still be stuck using RNA, or evolve into other configurations. It is unclear if our biochemistry is the most efficient one that could be generated, or which elements would follow a similar pattern. However, it is likely that, even if cells had a different composition to those from Earth, they would still have a cell membrane. Life on Earth jumped from prokaryotes to eukaryotes and from unicellular organisms to multicellular organisms through evolution. So far no alternative process to achieve such a result has been conceived, even if hypothetical. Evolution requires life to be divided into individual organisms, and no alternative organisation has been satisfactorily proposed either. At the basic level, membranes define the limit of a cell, between it and its environment, while remaining partially open to exchange energy and resources with it. The evolution from simple cells to eukaryotes, and from them to multicellular lifeforms, is not guaranteed. The Cambrian explosion took place thousands of millions of years after the origin of life, and its causes are not fully known yet. On the other hand, the jump to multicellularity took place several times, which suggests that it could be a case of convergent evolution, and so likely to take place on other planets as well. Palaeontologist Simon Conway Morris considers that convergent evolution would lead to kingdoms similar to our plants and animals, and that many features are likely to develop in alien animals as well, such as bilateral symmetry, limbs, digestive systems and heads with sensory organs. Scientists from the University of Oxford analysed it from the perspective of evolutionary theory and wrote in a study in the International Journal of Astrobiology that aliens may be similar to humans. The planetary context would also have an influence: a planet with higher gravity would have smaller animals, and other types of stars can lead to non-green photosynthesizers. The amount of energy available would also affect biodiversity, as an ecosystem sustained by black smokers or hydrothermal vents would have less energy available than those sustained by a star's light and heat, and so its lifeforms would not grow beyond a certain complexity. There is also research in assessing the capacity of life for developing intelligence. It has been suggested that this capacity arises with the number of potential niches a planet contains, and that the complexity of life itself is reflected in the information density of planetary environments, which in turn can be computed from its niches. It is common knowledge that the conditions on other planets in the solar system, in addition to the many galaxies outside of the Milky Way galaxy, are very harsh and seem to be too extreme to harbor any life. The environmental conditions on these planets can have intense UV radiation paired with extreme temperatures, lack of water, and much more that can lead to conditions that don't seem to favor the creation or maintenance of extraterrestrial life. However, there has been much historical evidence that some of the earliest and most basic forms of life on Earth originated in some extreme environments that seem unlikely to have harbored life at least at one point in Earth's history. Fossil evidence as well as many historical theories backed up by years of research and studies have marked environments like hydrothermal vents or acidic hot springs as some of the first places that life could have originated on Earth. These environments can be considered extreme when compared to the typical ecosystems that the majority of life on Earth now inhabit, as hydrothermal vents are scorching hot due to the magma escaping from the Earth's mantle and meeting the much colder oceanic water. Even in today's world, there can be a diverse population of bacteria found inhabiting the area surrounding these hydrothermal vents which can suggest that some form of life can be supported even in the harshest of environments like the other planets in the solar system. The aspects of these harsh environments that make them ideal for the origin of life on Earth, as well as the possibility of creation of life on other planets, is the chemical reactions forming spontaneously. For example, the hydrothermal vents found on the ocean floor are known to support many chemosynthetic processes which allow organisms to utilize energy through reduced chemical compounds that fix carbon. In return, these reactions will allow for organisms to live in relatively low oxygenated environments while maintaining enough energy to support themselves. The early Earth environment was reducing and therefore, these carbon fixing compounds were necessary for the survival and possible origin of life on Earth. With the little amount of information that scientists have found regarding the atmosphere on other planets in the Milky Way galaxy and beyond, the atmospheres are most likely reducing or with very low oxygen levels, especially when compared with Earth's atmosphere. If there were the necessary elements and ions on these planets, the same carbon fixing, reduced chemical compounds occurring around hydrothermal vents could also occur on these planets' surfaces and possibly result in the origin of extraterrestrial life. Planetary habitability in the Solar System The Solar System has a wide variety of planets, dwarf planets, and moons, and each one is studied for its potential to host life. Each one has its own specific conditions that may benefit or harm life. So far, the only lifeforms found are those from Earth. No extraterrestrial intelligence other than humans exists or has ever existed within the Solar System. Astrobiologist Mary Voytek points out that it would be unlikely to find large ecosystems, as they would have already been detected by now. The inner Solar System is likely devoid of life. However, Venus is still of interest to astrobiologists, as it is a terrestrial planet that was likely similar to Earth in its early stages and developed in a different way. There is a greenhouse effect, the surface is the hottest in the Solar System, sulfuric acid clouds, all surface liquid water is lost, and it has a thick carbon-dioxide atmosphere with huge pressure. Comparing both helps to understand the precise differences that lead to beneficial or harmful conditions for life. And despite the conditions against life on Venus, there are suspicions that microbial life-forms may still survive in high-altitude clouds. Mars is a cold and almost airless desert, inhospitable to life. However, recent studies revealed that water on Mars used to be quite abundant, forming rivers, lakes, and perhaps even oceans. Mars may have been habitable back then, and life on Mars may have been possible. But when the planetary core ceased to generate a magnetic field, solar winds removed the atmosphere and the planet became vulnerable to solar radiation. Ancient life-forms may still have left fossilised remains, and microbes may still survive deep underground. As mentioned, the gas giants and ice giants are unlikely to contain life. The most distant solar system bodies, found in the Kuiper Belt and outwards, are locked in permanent deep-freeze, but cannot be ruled out completely. Although the giant planets themselves are highly unlikely to have life, there is much hope to find it on moons orbiting these planets. Europa, from the Jovian system, has a subsurface ocean below a thick layer of ice. Ganymede and Callisto also have subsurface oceans, but life is less likely in them because water is sandwiched between layers of solid ice. Europa would have contact between the ocean and the rocky surface, which helps the chemical reactions. It may be difficult to dig so deep in order to study those oceans, though. Enceladus, a tiny moon of Saturn with another subsurface ocean, may not need to be dug, as it releases water to space in eruption columns. The space probe Cassini flew inside one of these, but could not make a full study because NASA did not expect this phenomenon and did not equip the probe to study ocean water. Still, Cassini detected complex organic molecules, salts, evidence of hydrothermal activity, hydrogen, and methane. Titan is the only celestial body in the Solar System besides Earth that has liquid bodies on the surface. It has rivers, lakes, and rain of hydrocarbons, methane, and ethane, and even a cycle similar to Earth's water cycle. This special context encourages speculations about lifeforms with different biochemistry, but the cold temperatures would make such chemistry take place at a very slow pace. Water is rock-solid on the surface, but Titan does have a subsurface water ocean like several other moons. However, it is of such a great depth that it would be very difficult to access it for study. Scientific search The science that searches and studies life in the universe, both on Earth and elsewhere, is called astrobiology. With the study of Earth's life, the only known form of life, astrobiology seeks to study how life starts and evolves and the requirements for its continuous existence. This helps to determine what to look for when searching for life in other celestial bodies. This is a complex area of study, and uses the combined perspectives of several scientific disciplines, such as astronomy, biology, chemistry, geology, oceanography, and atmospheric sciences. The scientific search for extraterrestrial life is being carried out both directly and indirectly. As of September 2017[update], 3,667 exoplanets in 2,747 systems have been identified, and other planets and moons in the Solar System hold the potential for hosting primitive life such as microorganisms. As of 8 February 2021, an updated status of studies considering the possible detection of lifeforms on Venus (via phosphine) and Mars (via methane) was reported. Scientists search for biosignatures within the Solar System by studying planetary surfaces and examining meteorites. Some claim to have identified evidence that microbial life has existed on Mars. In 1996, a controversial report stated that structures resembling nanobacteria were discovered in a meteorite, ALH84001, formed of rock ejected from Mars. Although all the unusual properties of the meteorite were eventually explained as the result of inorganic processes, the controversy over its discovery laid the groundwork for the development of astrobiology. An experiment on the two Viking Mars landers reported gas emissions from heated Martian soil samples that some scientists argue are consistent with the presence of living microorganisms. Lack of corroborating evidence from other experiments on the same samples suggests that a non-biological reaction is a more likely hypothesis. In February 2005 NASA scientists reported they may have found some evidence of extraterrestrial life on Mars. The two scientists, Carol Stoker and Larry Lemke of NASA's Ames Research Center, based their claim on methane signatures found in Mars's atmosphere resembling the methane production of some forms of primitive life on Earth, as well as on their own study of primitive life near the Rio Tinto river in Spain. NASA officials soon distanced NASA from the scientists' claims, and Stoker herself backed off from her initial assertions. In November 2011, NASA launched the Mars Science Laboratory that landed the Curiosity rover on Mars. It is designed to assess the past and present habitability on Mars using a variety of scientific instruments. The rover landed on Mars at Gale Crater in August 2012. A group of scientists at Cornell University started a catalog of microorganisms, with the way each one reacts to sunlight. The goal is to help with the search for similar organisms in exoplanets, as the starlight reflected by planets rich in such organisms would have a specific spectrum, unlike that of starlight reflected from lifeless planets. If Earth was studied from afar with this system, it would reveal a shade of green, as a result of the abundance of plants with photosynthesis. In August 2011, NASA studied meteorites found on Antarctica, finding adenine, guanine, hypoxanthine, and xanthine. Adenine and guanine are components of DNA, and the others are used in other biological processes. The studies ruled out pollution of the meteorites on Earth, as those components would not be freely available the way they were found in the samples. This discovery suggests that several organic molecules that serve as building blocks of life may be generated within asteroids and comets. In October 2011, scientists reported that cosmic dust contains complex organic compounds ("amorphous organic solids with a mixed aromatic-aliphatic structure") that could be created naturally, and rapidly, by stars. It is still unclear if those compounds played a role in the creation of life on Earth, but Sun Kwok, of the University of Hong Kong, thinks so. "If this is the case, life on Earth may have had an easier time getting started as these organics can serve as basic ingredients for life." In August 2012, and in a world first, astronomers at Copenhagen University reported the detection of a specific sugar molecule, glycolaldehyde, in a distant star system. The molecule was found around the protostellar binary IRAS 16293-2422, which is located 400 light years from Earth. Glycolaldehyde is needed to form ribonucleic acid, or RNA, which is similar in function to DNA. This finding suggests that complex organic molecules may form in stellar systems prior to the formation of planets, eventually arriving on young planets early in their formation. In December 2023, astronomers reported the first time discovery, in the plumes of Enceladus, moon of the planet Saturn, of hydrogen cyanide, a possible chemical essential for life as we know it, as well as other organic molecules, some of which are yet to be better identified and understood. According to the researchers, "these [newly discovered] compounds could potentially support extant microbial communities or drive complex organic synthesis leading to the origin of life." Although most searches are focused on the biology of extraterrestrial life, an extraterrestrial intelligence capable enough to develop a civilization may be detectable by other means as well. Technology may generate technosignatures, effects on the native planet that may not be caused by natural causes. There are three main types of techno-signatures considered: interstellar communications, effects on the atmosphere, and planetary-sized structures such as Dyson spheres. Organizations such as the SETI Institute search the cosmos for potential forms of communication. They started with radio waves, and now search for laser pulses as well. The challenge for this search is that there are natural sources of such signals as well, such as gamma-ray bursts and supernovae, and the difference between a natural signal and an artificial one would be in its specific patterns. Astronomers intend to use artificial intelligence for this, as it can manage large amounts of data and is devoid of biases and preconceptions. Besides, even if there is an advanced extraterrestrial civilization, there is no guarantee that it is transmitting radio communications in the direction of Earth. The length of time required for a signal to travel across space means that a potential answer may arrive decades or centuries after the initial message. The atmosphere of Earth is rich in nitrogen dioxide as a result of air pollution, which can be detectable. The natural abundance of carbon, which is also relatively reactive, makes it likely to be a basic component of the development of a potential extraterrestrial technological civilization, as it is on Earth. Fossil fuels may likely be generated and used on such worlds as well. The abundance of chlorofluorocarbons in the atmosphere can also be a clear technosignature, considering their role in ozone depletion. Light pollution may be another technosignature, as multiple lights on the night side of a rocky planet can be a sign of advanced technological development. However, modern telescopes are not strong enough to study exoplanets with the required level of detail to perceive it. The Kardashev scale proposes that a civilization may eventually start consuming energy directly from its local star. This would require giant structures built next to it, called Dyson spheres. Those speculative structures would cause an excess infrared radiation, that telescopes may notice. The infrared radiation is typical of young stars, surrounded by dusty protoplanetary disks that will eventually form planets. An older star such as the Sun would have no natural reason to have excess infrared radiation. The presence of heavy elements in a star's light-spectrum is another potential biosignature; such elements would (in theory) be found if the star were being used as an incinerator/repository for nuclear waste products. Some astronomers search for extrasolar planets that may be conducive to life, narrowing the search to terrestrial planets within the habitable zones of their stars. Since 1992, over four thousand exoplanets have been discovered (6,128 planets in 4,584 planetary systems including 1,017 multiple planetary systems as of 30 October 2025). The extrasolar planets so far discovered range in size from that of terrestrial planets similar to Earth's size to that of gas giants larger than Jupiter. The number of observed exoplanets is expected to increase greatly in the coming years.[better source needed] The Kepler space telescope has also detected a few thousand candidate planets, of which about 11% may be false positives. There is at least one planet on average per star. About 1 in 5 Sun-like stars[a] have an "Earth-sized"[b] planet in the habitable zone,[c] with the nearest expected to be within 12 light-years distance from Earth. Assuming 200 billion stars in the Milky Way,[d] that would be 11 billion potentially habitable Earth-sized planets in the Milky Way, rising to 40 billion if red dwarfs are included. The rogue planets in the Milky Way possibly number in the trillions. The nearest known exoplanet is Proxima Centauri b, located 4.2 light-years (1.3 pc) from Earth in the southern constellation of Centaurus. As of March 2014[update], the least massive exoplanet known is PSR B1257+12 A, which is about twice the mass of the Moon. The most massive planet listed on the NASA Exoplanet Archive is DENIS-P J082303.1−491201 b, about 29 times the mass of Jupiter, although according to most definitions of a planet, it is too massive to be a planet and may be a brown dwarf instead. Almost all of the planets detected so far are within the Milky Way, but there have also been a few possible detections of extragalactic planets. The study of planetary habitability also considers a wide range of other factors in determining the suitability of a planet for hosting life. One sign that a planet probably already contains life is the presence of an atmosphere with significant amounts of oxygen, since that gas is highly reactive and generally would not last long without constant replenishment. This replenishment occurs on Earth through photosynthetic organisms. One way to analyse the atmosphere of an exoplanet is through spectrography when it transits its star, though this might only be feasible with dim stars like white dwarfs. History and cultural impact The modern concept of extraterrestrial life is based on assumptions that were not commonplace during the early days of astronomy. The first explanations for the celestial objects seen in the night sky were based on mythology. Scholars from Ancient Greece were the first to consider that the universe is inherently understandable and rejected explanations based on supernatural incomprehensible forces, such as the myth of the Sun being pulled across the sky in the chariot of Apollo. They had not developed the scientific method yet and based their ideas on pure thought and speculation, but they developed precursor ideas to it, such as that explanations had to be discarded if they contradict observable facts. The discussions of those Greek scholars established many of the pillars that would eventually lead to the idea of extraterrestrial life, such as Earth being round and not flat. The cosmos was first structured in a geocentric model that considered that the sun and all other celestial bodies revolve around Earth. However, they did not consider them as worlds. In Greek understanding, the world was composed by both Earth and the celestial objects with noticeable movements. Anaximander thought that the cosmos was made from apeiron, a substance that created the world, and that the world would eventually return to the cosmos. Eventually two groups emerged, the atomists that thought that matter at both Earth and the cosmos was equally made of small atoms of the classical elements (earth, water, fire and air), and the Aristotelians who thought that those elements were exclusive of Earth and that the cosmos was made of a fifth one, the aether. Atomist Epicurus thought that the processes that created the world, its animals and plants should have created other worlds elsewhere, along with their own animals and plants. Aristotle thought instead that all the earth element naturally fell towards the center of the universe, and that would make it impossible for other planets to exist elsewhere. Under that reasoning, Earth was not only in the center, it was also the only planet in the universe. Cosmic pluralism, the plurality of worlds, or simply pluralism, describes the philosophical belief in numerous "worlds" in addition to Earth, which might harbor extraterrestrial life. The earliest recorded assertion of extraterrestrial human life is found in ancient scriptures of Jainism. There are multiple "worlds" mentioned in Jain scriptures that support human life. These include, among others, Bharat Kshetra, Mahavideh Kshetra, Airavat Kshetra, and Hari kshetra. Medieval Muslim writers like Fakhr al-Din al-Razi and Muhammad al-Baqir supported cosmic pluralism on the basis of the Qur'an. Chaucer's poem The House of Fame engaged in medieval thought experiments that postulated the plurality of worlds. However, those ideas about other worlds were different from the current knowledge about the structure of the universe, and did not postulate the existence of planetary systems other than the Solar System. When those authors talk about other worlds, they talk about places located at the center of their own systems, and with their own stellar vaults and cosmos surrounding them. The Greek ideas and the disputes between atomists and Aristotelians outlived the fall of the Greek empire. The Great Library of Alexandria compiled information about it, part of which was translated by Islamic scholars and thus survived the end of the Library. Baghdad combined the knowledge of the Greeks, the Indians, the Chinese and its own scholars, and the knowledge expanded through the Byzantine Empire. From there it eventually returned to Europe by the time of the Middle Ages. However, as the Greek atomist doctrine held that the world was created by random movements of atoms, with no need for a creator deity, it became associated with atheism, and the dispute intertwined with religious ones. Still, the Church did not react to those topics in a homogeneous way, and there were stricter and more permissive views within the church itself. The first known mention of the term 'panspermia' was in the writings of the 5th-century BC Greek philosopher Anaxagoras. He proposed the idea that life exists everywhere. By the time of the late Middle Ages there were many known inaccuracies in the geocentric model, but it was kept in use because naked eye observations provided limited data. Nicolaus Copernicus started the Copernican Revolution by proposing that the planets revolve around the sun rather than Earth. His proposal had little acceptance at first because, as he kept the assumption that orbits were perfect circles, his model led to as many inaccuracies as the geocentric one. Tycho Brahe improved the available data with naked-eye observatories, which worked with highly complex sextants and quadrants. Tycho could not make sense of his observations, but Johannes Kepler did: orbits were not perfect circles, but ellipses. This knowledge benefited the Copernican model, which worked now almost perfectly. The invention of the telescope a short time later, perfected by Galileo Galilei, clarified the final doubts, and the paradigm shift was completed. Under this new understanding, the notion of extraterrestrial life became feasible: if Earth is but just a planet orbiting around a star, there may be planets similar to Earth elsewhere. The astronomical study of distant bodies also proved that physical laws are the same elsewhere in the universe as on Earth, with nothing making the planet truly special. The new ideas were met with resistance from the Catholic church. Galileo was tried for the heliocentric model, which was considered heretical, and forced to recant it. The best-known early-modern proponent of ideas of extraterrestrial life was the Italian philosopher Giordano Bruno, who argued in the 16th century for an infinite universe in which every star is surrounded by its own planetary system. Bruno wrote that other worlds "have no less virtue nor a nature different to that of our earth" and, like Earth, "contain animals and inhabitants". Bruno's belief in the plurality of worlds was one of the charges leveled against him by the Venetian Holy Inquisition, which tried and executed him. The heliocentric model was further strengthened by the postulation of the theory of gravity by Sir Isaac Newton. This theory provided the mathematics that explains the motions of all things in the universe, including planetary orbits. By this point, the geocentric model was definitely discarded. By this time, the use of the scientific method had become a standard, and new discoveries were expected to provide evidence and rigorous mathematical explanations. Science also took a deeper interest in the mechanics of natural phenomena, trying to explain not just the way nature works but also the reasons for working that way. There was very little actual discussion about extraterrestrial life before this point, as the Aristotelian ideas remained influential while geocentrism was still accepted. When it was finally proved wrong, it not only meant that Earth was not the center of the universe, but also that the lights seen in the sky were not just lights, but physical objects. The notion that life may exist in them as well soon became an ongoing topic of discussion, although one with no practical ways to investigate. The possibility of extraterrestrials remained a widespread speculation as scientific discovery accelerated. William Herschel, the discoverer of Uranus, was one of many 18th–19th-century astronomers who believed that the Solar System is populated by alien life. Other scholars of the period who championed "cosmic pluralism" included Immanuel Kant and Benjamin Franklin. At the height of the Enlightenment, even the Sun and Moon were considered candidates for extraterrestrial inhabitants. Speculation about life on Mars increased in the late 19th century, following telescopic observation of apparent Martian canals – which soon, however, turned out to be optical illusions. Despite this, in 1895, American astronomer Percival Lowell published his book Mars, followed by Mars and its Canals in 1906, proposing that the canals were the work of a long-gone civilisation. Spectroscopic analysis of Mars's atmosphere began in earnest in 1894, when U.S. astronomer William Wallace Campbell showed that neither water nor oxygen was present in the Martian atmosphere. By 1909 better telescopes and the best perihelic opposition of Mars since 1877 conclusively put an end to the canal hypothesis. As a consequence of the belief in the spontaneous generation there was little thought about the conditions of each celestial body: it was simply assumed that life would thrive anywhere. This theory was disproved by Louis Pasteur in the 19th century. Popular belief in thriving alien civilisations elsewhere in the solar system still remained strong until Mariner 4 and Mariner 9 provided close images of Mars, which debunked forever the idea of the existence of Martians and decreased the previous expectations of finding alien life in general. The end of the spontaneous generation belief forced investigation into the origin of life. Although abiogenesis is the more accepted theory, a number of authors reclaimed the term "panspermia" and proposed that life was brought to Earth from elsewhere. Some of those authors are Jöns Jacob Berzelius (1834), Kelvin (1871), Hermann von Helmholtz (1879) and, somewhat later, by Svante Arrhenius (1903). The science fiction genre, although not so named during the time, developed during the late 19th century. The expansion of the genre of extraterrestrials in fiction influenced the popular perception over the real-life topic, making people eager to jump to conclusions about the discovery of aliens. Science marched at a slower pace, some discoveries fueled expectations and others dashed excessive hopes. For example, with the advent of telescopes, most structures seen on the Moon or Mars were immediately attributed to Selenites or Martians, and later ones (such as more powerful telescopes) revealed that all such discoveries were natural features. A famous case is the Cydonia region of Mars, first imaged by the Viking 1 orbiter. The low-resolution photos showed a rock formation that resembled a human face, but later spacecraft took photos in higher detail that showed that there was nothing special about the site. The search and study of extraterrestrial life became a science of its own, astrobiology. Also known as exobiology, this discipline is studied by the NASA, the ESA, the INAF, and others. Astrobiology studies life from Earth as well, but with a cosmic perspective. For example, abiogenesis is of interest to astrobiology, not because of the origin of life on Earth, but for the chances of a similar process taking place in other celestial bodies. Many aspects of life, from its definition to its chemistry, are analyzed as either likely to be similar in all forms of life across the cosmos or only native to Earth. Astrobiology, however, remains constrained by the current lack of extraterrestrial life-forms to study, as all life on Earth comes from the same ancestor, and it is hard to infer general characteristics from a group with a single example to analyse. The 20th century came with great technological advances, speculations about future hypothetical technologies, and an increased basic knowledge of science by the general population thanks to science divulgation through the mass media. The public interest in extraterrestrial life and the lack of discoveries by mainstream science led to the emergence of pseudosciences that provided affirmative, if questionable, answers to the existence of aliens. Ufology claims that many unidentified flying objects (UFOs) would be spaceships from alien species, and ancient astronauts hypothesis claim that aliens would have visited Earth in antiquity and prehistoric times but people would have failed to understand it by then. Most UFOs or UFO sightings can be readily explained as sightings of Earth-based aircraft (including top-secret aircraft), known astronomical objects or weather phenomenons, or as hoaxes. Looking beyond the pseudosciences, Lewis White Beck strove to elevate the level of public discourse on the topic of extraterrestrial life by tracing the evolution of philosophical thought over the centuries from ancient times into the modern era. His review of the contributions made by Lucretius, Plutarch, Aristotle, Copernicus, Immanuel Kant, John Wilkins, Charles Darwin and Karl Marx demonstrated that even in modern times, humanity could be profoundly influenced in its search for extraterrestrial life by subtle and comforting archetypal ideas which are largely derived from firmly held religious, philosophical and existential belief systems. On a positive note, however, Beck further argued that even if the search for extraterrestrial life proves to be unsuccessful, the endeavor itself could have beneficial consequences by assisting humanity in its attempt to actualize superior ways of living here on Earth. By the 21st century, it was accepted that multicellular life in the Solar System can only exist on Earth, but the interest in extraterrestrial life increased regardless. This is a result of the advances in several sciences. The knowledge of planetary habitability allows to consider on scientific terms the likelihood of finding life at each specific celestial body, as it is known which features are beneficial and harmful for life. Astronomy and telescopes also improved to the point exoplanets can be confirmed and even studied, increasing the number of search places. Life may still exist elsewhere in the Solar System in unicellular form, but the advances in spacecraft allow to send robots to study samples in situ, with tools of growing complexity and reliability. Although no extraterrestrial life has been found and life may still be just a rarity from Earth, there are scientific reasons to suspect that it can exist elsewhere, and technological advances that may detect it if it does. Many scientists are optimistic about the chances of finding alien life. In the words of SETI's Frank Drake, "All we know for sure is that the sky is not littered with powerful microwave transmitters". Drake noted that it is entirely possible that advanced technology results in communication being carried out in some way other than conventional radio transmission. At the same time, the data returned by space probes, and giant strides in detection methods, have allowed science to begin delineating habitability criteria on other worlds, and to confirm that at least other planets are plentiful, though aliens remain a question mark. The Wow! signal, detected in 1977 by a SETI project, remains a subject of speculative debate. On the other hand, other scientists are pessimistic. Jacques Monod wrote that "Man knows at last that he is alone in the indifferent immensity of the universe, whence which he has emerged by chance". In 2000, geologist and paleontologist Peter Ward and astrobiologist Donald Brownlee published a book entitled Rare Earth: Why Complex Life is Uncommon in the Universe.[better source needed] In it, they discussed the Rare Earth hypothesis, in which they claim that Earth-like life is rare in the universe, whereas microbial life is common. Ward and Brownlee are open to the idea of evolution on other planets that is not based on essential Earth-like characteristics such as DNA and carbon. As for the possible risks, theoretical physicist Stephen Hawking warned in 2010 that humans should not try to contact alien life forms. He warned that aliens might pillage Earth for resources. "If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans", he said. Jared Diamond had earlier expressed similar concerns. On 20 July 2015, Hawking and Russian billionaire Yuri Milner, along with the SETI Institute, announced a well-funded effort, called the Breakthrough Initiatives, to expand efforts to search for extraterrestrial life. The group contracted the services of the 100-meter Robert C. Byrd Green Bank Telescope in West Virginia in the United States and the 64-meter Parkes Telescope in New South Wales, Australia. On 13 February 2015, scientists (including Geoffrey Marcy, Seth Shostak, Frank Drake and David Brin) at a convention of the American Association for the Advancement of Science, discussed Active SETI and whether transmitting a message to possible intelligent extraterrestrials in the Cosmos was a good idea; one result was a statement, signed by many, that a "worldwide scientific, political and humanitarian discussion must occur before any message is sent". Government responses The 1967 Outer Space Treaty and the 1979 Moon Agreement define rules of planetary protection against potentially hazardous extraterrestrial life. COSPAR also provides guidelines for planetary protection. A committee of the United Nations Office for Outer Space Affairs had in 1977 discussed for a year strategies for interacting with extraterrestrial life or intelligence. The discussion ended without any conclusions. As of 2010, the UN lacks response mechanisms for the case of an extraterrestrial contact. One of the NASA divisions is the Office of Safety and Mission Assurance (OSMA), also known as the Planetary Protection Office. A part of its mission is to "rigorously preclude backward contamination of Earth by extraterrestrial life." In 2016, the Chinese Government released a white paper detailing its space program. According to the document, one of the research objectives of the program is the search for extraterrestrial life. It is also one of the objectives of the Chinese Five-hundred-meter Aperture Spherical Telescope (FAST) program. In 2020, Dmitry Rogozin, the head of the Russian space agency, said the search for extraterrestrial life is one of the main goals of deep space research. He also acknowledged the possibility of existence of primitive life on other planets of the Solar System. The French space agency has an office for the study of "non-identified aero spatial phenomena". The agency is maintaining a publicly accessible database of such phenomena, with over 1600 detailed entries. According to the head of the office, the vast majority of entries have a mundane explanation; but for 25% of entries, their extraterrestrial origin can neither be confirmed nor denied. In 2020, chairman of the Israel Space Agency Isaac Ben-Israel stated that the probability of detecting life in outer space is "quite large". But he disagrees with his former colleague Haim Eshed who stated that there are contacts between an advanced alien civilisation and some of Earth's governments. In fiction Although the idea of extraterrestrial peoples became feasible once astronomy developed enough to understand the nature of planets, they were not thought of as being any different from humans. Having no scientific explanation for the origin of mankind and its relation to other species, there was no reason to expect them to be any other way. This was changed by the 1859 book On the Origin of Species by Charles Darwin, which proposed the theory of evolution. Now with the notion that evolution on other planets may take other directions, science fiction authors created bizarre aliens, clearly distinct from humans. A usual way to do that was to add body features from other animals, such as insects or octopuses. Costuming and special effects feasibility alongside budget considerations forced films and TV series to tone down the fantasy, but these limitations lessened since the 1990s with the advent of computer-generated imagery (CGI), and later on as CGI became more effective and less expensive. Real-life events sometimes captivate people's imagination and this influences the works of fiction. For example, during the Barney and Betty Hill incident, the first recorded claim of an alien abduction, the couple reported that they were abducted and experimented on by aliens with oversized heads, big eyes, pale grey skin, and small noses, a description that eventually became the grey alien archetype once used in works of fiction. See also Notes References Further reading External links |
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Contents Meta Platforms Meta Platforms, Inc. (doing business as Meta) is an American multinational technology company headquartered in Menlo Park, California. Meta owns and operates several prominent social media platforms and communication services, including Facebook, Instagram, WhatsApp, Messenger, Threads and Manus. The company also operates an advertising network for its own sites and third parties; as of 2023[update], advertising accounted for 97.8 percent of its total revenue. Meta has been described as a part of Big Tech, which refers to the largest six tech companies in the United States, Alphabet (Google), Amazon, Apple, Meta (Facebook), Microsoft, and Nvidia, which are also the largest companies in the world by market capitalization. The company was originally established in 2004 as TheFacebook, Inc., and was renamed Facebook, Inc. in 2005. In 2021, it rebranded as Meta Platforms, Inc. to reflect a strategic shift toward developing the metaverse—an interconnected digital ecosystem spanning virtual and augmented reality technologies. In 2023, Meta was ranked 31st on the Forbes Global 2000 list of the world's largest public companies. As of 2022, it was the world's third-largest spender on research and development, with R&D expenses totaling US$35.3 billion. History Facebook filed for an initial public offering (IPO) on January 1, 2012. The preliminary prospectus stated that the company sought to raise $5 billion, had 845 million monthly active users, and a website accruing 2.7 billion likes and comments daily. After the IPO, Zuckerberg would retain 22% of the total shares and 57% of the total voting power in Facebook. Underwriters valued the shares at $38 each, valuing the company at $104 billion, the largest valuation yet for a newly public company. On May 16, one day before the IPO, Facebook announced it would sell 25% more shares than originally planned due to high demand. The IPO raised $16 billion, making it the third-largest in US history (slightly ahead of AT&T Mobility and behind only General Motors and Visa). The stock price left the company with a higher market capitalization than all but a few U.S. corporations—surpassing heavyweights such as Amazon, McDonald's, Disney, and Kraft Foods—and made Zuckerberg's stock worth $19 billion. The New York Times stated that the offering overcame questions about Facebook's difficulties in attracting advertisers to transform the company into a "must-own stock". Jimmy Lee of JPMorgan Chase described it as "the next great blue-chip". Writers at TechCrunch, on the other hand, expressed skepticism, stating, "That's a big multiple to live up to, and Facebook will likely need to add bold new revenue streams to justify the mammoth valuation." Trading in the stock, which began on May 18, was delayed that day due to technical problems with the Nasdaq exchange. The stock struggled to stay above the IPO price for most of the day, forcing underwriters to buy back shares to support the price. At the closing bell, shares were valued at $38.23, only $0.23 above the IPO price and down $3.82 from the opening bell value. The opening was widely described by the financial press as a disappointment. The stock set a new record for trading volume of an IPO. On May 25, 2012, the stock ended its first full week of trading at $31.91, a 16.5% decline. On May 22, 2012, regulators from Wall Street's Financial Industry Regulatory Authority announced that they had begun to investigate whether banks underwriting Facebook had improperly shared information only with select clients rather than the general public. Massachusetts Secretary of State William F. Galvin subpoenaed Morgan Stanley over the same issue. The allegations sparked "fury" among some investors and led to the immediate filing of several lawsuits, one of them a class action suit claiming more than $2.5 billion in losses due to the IPO. Bloomberg estimated that retail investors may have lost approximately $630 million on Facebook stock since its debut. S&P Global Ratings added Facebook to its S&P 500 index on December 21, 2013. On May 2, 2014, Zuckerberg announced that the company would be changing its internal motto from "Move fast and break things" to "Move fast with stable infrastructure". The earlier motto had been described as Zuckerberg's "prime directive to his developers and team" in a 2009 interview in Business Insider, in which he also said, "Unless you are breaking stuff, you are not moving fast enough." In November 2016, Facebook announced the Microsoft Windows client of gaming service Facebook Gameroom, formerly Facebook Games Arcade, at the Unity Technologies developers conference. The client allows Facebook users to play "native" games in addition to its web games. The service was closed in June 2021. Lasso was a short-video sharing app from Facebook similar to TikTok that was launched on iOS and Android in 2018 and was aimed at teenagers. On July 2, 2020, Facebook announced that Lasso would be shutting down on July 10. In 2018, the Oculus lead Jason Rubin sent his 50-page vision document titled "The Metaverse" to Facebook's leadership. In the document, Rubin acknowledged that Facebook's virtual reality business had not caught on as expected, despite the hundreds of millions of dollars spent on content for early adopters. He also urged the company to execute fast and invest heavily in the vision, to shut out HTC, Apple, Google and other competitors in the VR space. Regarding other players' participation in the metaverse vision, he called for the company to build the "metaverse" to prevent their competitors from "being in the VR business in a meaningful way at all". In May 2019, Facebook founded Libra Networks, reportedly to develop their own stablecoin cryptocurrency. Later, it was reported that Libra was being supported by financial companies such as Visa, Mastercard, PayPal and Uber. The consortium of companies was expected to pool in $10 million each to fund the launch of the cryptocurrency coin named Libra. Depending on when it would receive approval from the Swiss Financial Market Supervisory authority to operate as a payments service, the Libra Association had planned to launch a limited format cryptocurrency in 2021. Libra was renamed Diem, before being shut down and sold in January 2022 after backlash from Swiss government regulators and the public. During the COVID-19 pandemic, the use of online services, including Facebook, grew globally. Zuckerberg predicted this would be a "permanent acceleration" that would continue after the pandemic. Facebook hired aggressively, growing from 48,268 employees in March 2020 to more than 87,000 by September 2022. Following a period of intense scrutiny and damaging whistleblower leaks, news started to emerge on October 21, 2021 about Facebook's plan to rebrand the company and change its name. In the Q3 2021 earnings call on October 25, Mark Zuckerberg discussed the ongoing criticism of the company's social services and the way it operates, and pointed to the pivoting efforts to building the metaverse – without mentioning the rebranding and the name change. The metaverse vision and the name change from Facebook, Inc. to Meta Platforms was introduced at Facebook Connect on October 28, 2021. Based on Facebook's PR campaign, the name change reflects the company's shifting long term focus of building the metaverse, a digital extension of the physical world by social media, virtual reality and augmented reality features. "Meta" had been registered as a trademark in the United States in 2018 (after an initial filing in 2015) for marketing, advertising, and computer services, by a Canadian company that provided big data analysis of scientific literature. This company was acquired in 2017 by the Chan Zuckerberg Initiative (CZI), a foundation established by Zuckerberg and his wife, Priscilla Chan, and became one of their projects. Following the rebranding announcement, CZI announced that it had already decided to deprioritize the earlier Meta project, thus it would be transferring its rights to the name to Meta Platforms, and the previous project would end in 2022. Soon after the rebranding, in early February 2022, Meta reported a greater-than-expected decline in profits in the fourth quarter of 2021. It reported no growth in monthly users, and indicated it expected revenue growth to stall. It also expected measures taken by Apple Inc. to protect user privacy to cost it some $10 billion in advertisement revenue, an amount equal to roughly 8% of its revenue for 2021. In meeting with Meta staff the day after earnings were reported, Zuckerberg blamed competition for user attention, particularly from video-based apps such as TikTok. The 27% reduction in the company's share price which occurred in reaction to the news eliminated some $230 billion of value from Meta's market capitalization. Bloomberg described the decline as "an epic rout that, in its sheer scale, is unlike anything Wall Street or Silicon Valley has ever seen". Zuckerberg's net worth fell by as much as $31 billion. Zuckerberg owns 13% of Meta, and the holding makes up the bulk of his wealth. According to published reports by Bloomberg on March 30, 2022, Meta turned over data such as phone numbers, physical addresses, and IP addresses to hackers posing as law enforcement officials using forged documents. The law enforcement requests sometimes included forged signatures of real or fictional officials. When asked about the allegations, a Meta representative said, "We review every data request for legal sufficiency and use advanced systems and processes to validate law enforcement requests and detect abuse." In June 2022, Sheryl Sandberg, the chief operating officer of 14 years, announced she would step down that year. Zuckerberg said that Javier Olivan would replace Sandberg, though in a “more traditional” role. In March 2022, Meta (except Meta-owned WhatsApp) and Instagram were banned in Russia and added to the Russian list of terrorist and extremist organizations for alleged Russophobia and hate speech (up to genocidal calls) amid the ongoing Russian invasion of Ukraine. Meta appealed against the ban, but it was upheld by a Moscow court in June of the same year. Also in March 2022, Meta and Italian eyewear giant Luxottica released Ray-Ban Stories, a series of smartglasses which could play music and take pictures. Meta and Luxottica parent company EssilorLuxottica declined to disclose sales on the line of products as of September 2022, though Meta has expressed satisfaction with its customer feedback. In July 2022, Meta saw its first year-on-year revenue decline when its total revenue slipped by 1% to $28.8bn. Analysts and journalists accredited the loss to its advertising business, which has been limited by Apple's app tracking transparency feature and the number of people who have opted not to be tracked by Meta apps. Zuckerberg also accredited the decline to increasing competition from TikTok. On October 27, 2022, Meta's market value dropped to $268 billion, a loss of around $700 billion compared to 2021, and its shares fell by 24%. It lost its spot among the top 20 US companies by market cap, despite reaching the top 5 in the previous year. In November 2022, Meta laid off 11,000 employees, 13% of its workforce. Zuckerberg said the decision to aggressively increase Meta's investments had been a mistake, as he had wrongly predicted that the surge in e-commerce would last beyond the COVID-19 pandemic. He also attributed the decline to increased competition, a global economic downturn and "ads signal loss". Plans to lay off a further 10,000 employees began in April 2023. The layoffs were part of a general downturn in the technology industry, alongside layoffs by companies including Google, Amazon, Tesla, Snap, Twitter and Lyft. Starting from 2022, Meta scrambled to catch up to other tech companies in adopting specialized artificial intelligence hardware and software. It had been using less expensive CPUs instead of GPUs for AI work, but that approach turned out to be less efficient. The company gifted the Inter-university Consortium for Political and Social Research $1.3 million to finance the Social Media Archive's aim to make their data available to social science research. In 2023, Ireland's Data Protection Commissioner imposed a record EUR 1.2 billion fine on Meta for transferring data from Europe to the United States without adequate protections for EU citizens.: 250 In March 2023, Meta announced a new round of layoffs that would cut 10,000 employees and close 5,000 open positions to make the company more efficient. Meta revenue surpassed analyst expectations for the first quarter of 2023 after announcing that it was increasing its focus on AI. On July 6, Meta launched a new app, Threads, a competitor to Twitter. Meta announced its artificial intelligence model Llama 2 in July 2023, available for commercial use via partnerships with major cloud providers like Microsoft. It was the first project to be unveiled out of Meta's generative AI group after it was set up in February. It would not charge access or usage but instead operate with an open-source model to allow Meta to ascertain what improvements need to be made. Prior to this announcement, Meta said it had no plans to release Llama 2 for commercial use. An earlier version of Llama was released to academics. In August 2023, Meta announced its permanent removal of news content from Facebook and Instagram in Canada due to the Online News Act, which requires Canadian news outlets to be compensated for content shared on its platform. The Online News Act was in effect by year-end, but Meta will not participate in the regulatory process. In October 2023, Zuckerberg said that AI would be Meta's biggest investment area in 2024. Meta finished 2023 as one of the best-performing technology stocks of the year, with its share price up 150 percent. Its stock reached an all-time high in January 2024, bringing Meta within 2% of achieving $1 trillion market capitalization. In November 2023 Meta Platforms launched an ad-free service in Europe, allowing subscribers to opt-out of personal data being collected for targeted advertising. A group of 28 European organizations, including Max Schrems' advocacy group NOYB, the Irish Council for Civil Liberties, Wikimedia Europe, and the Electronic Privacy Information Center, signed a 2024 letter to the European Data Protection Board (EDPB) expressing concern that this subscriber model would undermine privacy protections, specifically GDPR data protection standards. Meta removed the Facebook and Instagram accounts of Iran's Supreme Leader Ali Khamenei in February 2024, citing repeated violations of its Dangerous Organizations & Individuals policy. As of March, Meta was under investigation by the FDA for alleged use of their social media platforms to sell illegal drugs. On 16 May 2024, the European Commission began an investigation into Meta over concerns related to child safety. In May 2023, Iraqi social media influencer Esaa Ahmed-Adnan encountered a troubling issue when Instagram removed his posts, citing false copyright violations despite his content being original and free from copyrighted material. He discovered that extortionists were behind these takedowns, offering to restore his content for $3,000 or provide ongoing protection for $1,000 per month. This scam, exploiting Meta’s rights management tools, became widespread in the Middle East, revealing a gap in Meta’s enforcement in developing regions. An Iraqi nonprofit Tech4Peace’s founder, Aws al-Saadi helped Ahmed-Adnan and others, but the restoration process was slow, leading to significant financial losses for many victims, including prominent figures like Ammar al-Hakim. This situation highlighted Meta’s challenges in balancing global growth with effective content moderation and protection. On 16 September 2024, Meta announced it had banned Russian state media outlets from its platforms worldwide due to concerns about "foreign interference activity." This decision followed allegations that RT and its employees funneled $10 million through shell companies to secretly fund influence campaigns on various social media channels. Meta's actions were part of a broader effort to counter Russian covert influence operations, which had intensified since the invasion. At its 2024 Connect conference, Meta presented Orion, its first pair of augmented reality glasses. Though Orion was originally intended to be sold to consumers, the manufacturing process turned out to be too complex and expensive. Instead, the company pivoted to producing a small number of the glasses to be used internally. On 4 October 2024, Meta announced about its new AI model called Movie Gen, capable of generating realistic video and audio clips based on user prompts. Meta stated it would not release Movie Gen for open development, preferring to collaborate directly with content creators and integrate it into its products by the following year. The model was built using a combination of licensed and publicly available datasets. On October 31, 2024, ProPublica published an investigation into deceptive political advertisement scams that sometimes use hundreds of hijacked profiles and facebook pages run by organized networks of scammers. The authors cited spotty enforcement by Meta as a major reason for the extent of the issue. In November 2024, TechCrunch reported that Meta were considering building a $10bn global underwater cable spanning 25,000 miles. In the same month, Meta closed down 2 million accounts on Facebook and Instagram that were linked to scam centers in Myanmar, Laos, Cambodia, the Philippines, and the United Arab Emirates doing pig butchering scams. In December 2024, Meta announced that, beginning February 2025, they would require advertisers to run ads about financial services in Australia to verify information about who are the beneficiary and the payer in a bid to regulate scams. On December 4, 2024, Meta announced it will invest US$10 billion for its largest AI data center in northeast Louisiana, powered by natural gas facilities. On the 11th of that month, Meta experienced a global outage, impacting accounts on all of their social media and messaging applications. Outage reports from DownDetector reached 70,000+ and 100,000+ within minutes for Instagram and Facebook, respectively. In January 2025, Meta announced plans to roll back its diversity, equity, and inclusion (DEI) initiatives, citing shifts in the "legal and policy landscape" in the United States following the 2024 presidential election. The decision followed reports that CEO Mark Zuckerberg sought to align the company more closely with the incoming Trump administration, including changes to content moderation policies and executive leadership. The new content moderation policies continued to bar insults about a person's intellect or mental illness, but made an exception to allow calling LGBTQ people mentally ill because they are gay or transgender. Later that month, Meta agreed to pay $25 million to settle a 2021 lawsuit brought by Donald Trump for suspending his social media accounts after the January 6 riots. Changes to Meta's moderation policies were controversial among its oversight board, with a significant divide in opinion between the board's US conservatives and its global members. In June 2025, Meta Platforms Inc. has decided to make a multibillion-dollar investment into artificial intelligence startup Scale AI. The financing could exceed $10 billion in value which would make it one of the largest private company funding events of all time. In October 2025, it was announced that Meta would be laying off 600 employees in the artificial intelligence unit to perform better and simpler. They referred to their AI unit as "bloated" and are seeking to trim down the department. This mass layoff is going to impact Meta’s AI infrastructure units, Fundamental Artificial Intelligence Research unit (FAIR) and other product-related positions. Mergers and acquisitions Meta has acquired multiple companies (often identified as talent acquisitions). One of its first major acquisitions was in April 2012, when it acquired Instagram for approximately US$1 billion in cash and stock. In October 2013, Facebook, Inc. acquired Onavo, an Israeli mobile web analytics company. In February 2014, Facebook, Inc. announced it would buy mobile messaging company WhatsApp for US$19 billion in cash and stock. The acquisition was completed on October 6. Later that year, Facebook bought Oculus VR for $2.3 billion in cash and stock, which released its first consumer virtual reality headset in 2016. In late November 2019, Facebook, Inc. announced the acquisition of the game developer Beat Games, responsible for developing one of that year's most popular VR games, Beat Saber. In Late 2022, after Facebook Inc rebranded to Meta Platforms Inc, Oculus was rebranded to Meta Quest. In May 2020, Facebook, Inc. announced it had acquired Giphy for a reported cash price of $400 million. It will be integrated with the Instagram team. However, in August 2021, UK's Competition and Markets Authority (CMA) stated that Facebook, Inc. might have to sell Giphy, after an investigation found that the deal between the two companies would harm competition in display advertising market. Facebook, Inc. was fined $70 million by CMA for deliberately failing to report all information regarding the acquisition and the ongoing antitrust investigation. In October 2022, the CMA ruled for a second time that Meta be required to divest Giphy, stating that Meta already controls half of the advertising in the UK. Meta agreed to the sale, though it stated that it disagrees with the decision itself. In May 2023, Giphy was divested to Shutterstock for $53 million. In November 2020, Facebook, Inc. announced that it planned to purchase the customer-service platform and chatbot specialist startup Kustomer to promote companies to use their platform for business. It has been reported that Kustomer valued at slightly over $1 billion. The deal was closed in February 2022 after regulatory approval. In September 2022, Meta acquired Lofelt, a Berlin-based haptic tech startup. In December 2025, it was announced Meta had acquired the AI-wearables startup, Limitless. In the same month, they also acquired another AI startup, Manus AI, for $2 billion. Manus announced in December that its platform had achieved $100mm in recurring revenue just 8 months after its launch and Meta said it will scale the platform to many other businesses. In January 2026, it was announced Meta proposed acquisition of Manus was undergoing preliminary scrutiny by Chinese regulators. The examination concerns the cross-border transfer of artificial intelligence technology developed in China. Lobbying In 2020, Facebook, Inc. spent $19.7 million on lobbying, hiring 79 lobbyists. In 2019, it had spent $16.7 million on lobbying and had a team of 71 lobbyists, up from $12.6 million and 51 lobbyists in 2018. Facebook was the largest spender of lobbying money among the Big Tech companies in 2020. The lobbying team includes top congressional aide John Branscome, who was hired in September 2021, to help the company fend off threats from Democratic lawmakers and the Biden administration. In December 2024, Meta donated $1 million to the inauguration fund for then-President-elect Donald Trump. In 2025, Meta was listed among the donors funding the construction of the White House State Ballroom. Partnerships February 2026, Meta announced a long-term partnership with Nvidia. Censorship In August 2024, Mark Zuckerberg sent a letter to Jim Jordan indicating that during the COVID-19 pandemic the Biden administration repeatedly asked Meta to limit certain COVID-19 content, including humor and satire, on Facebook and Instagram. In 2016 Meta hired Jordana Cutler, formerly an employee at the Israeli Embassy to the United States, as its policy chief for Israel and the Jewish Diaspora. In this role, Cutler pushed for the censorship of accounts belonging to Students for Justice in Palestine chapters in the United States. Critics have said that Cutler's position gives the Israeli government an undue influence over Meta policy, and that few countries have such high levels of contact with Meta policymakers. Following the election of Donald Trump in 2025, various sources noted possible censorship related to the Democratic Party on Instagram and other Meta platforms. In February 2025, a Meta rep flagged journalist Gil Duran's article and other "critiques of tech industry figures" as spam or sensitive content, limiting their reach. In March 2025, Meta attempted to block former employee Sarah Wynn-Williams from promoting or further distributing her memoir, Careless People, that includes allegations of unaddressed sexual harassment in the workplace by senior executives. The New York Times reports that the arbitration is among Meta's most forcible attempts to repudiate a former employee's account of workplace dynamics. Publisher Macmillan reacted to the ruling by the Emergency International Arbitral Tribunal by stating that it will ignore its provisions. As of 15 March 2025[update], hardback and digital versions of Careless People were being offered for sale by major online retailers. From October 2025, Meta began removing and restricting access for accounts related to LGBTQ, reproductive health and abortion information pages on its platforms. Martha Dimitratou, executive director of Repro Uncensored, called Meta's shadow-banning of these issues "One of the biggest waves of censorship we are seeing". Disinformation concerns Since its inception, Meta has been accused of being a host for fake news and misinformation. In the wake of the 2016 United States presidential election, Zuckerberg began to take steps to eliminate the prevalence of fake news, as the platform had been criticized for its potential influence on the outcome of the election. The company initially partnered with ABC News, the Associated Press, FactCheck.org, Snopes and PolitiFact for its fact-checking initiative; as of 2018, it had over 40 fact-checking partners across the world, including The Weekly Standard. A May 2017 review by The Guardian found that the platform's fact-checking initiatives of partnering with third-party fact-checkers and publicly flagging fake news were regularly ineffective, and appeared to be having minimal impact in some cases. In 2018, journalists working as fact-checkers for the company criticized the partnership, stating that it had produced minimal results and that the company had ignored their concerns. In 2024 Meta's decision to continue to disseminate a falsified video of US president Joe Biden, even after it had been proven to be fake, attracted criticism and concern. In January 2025, Meta ended its use of third-party fact-checkers in favor of a user-run community notes system similar to the one used on X. While Zuckerberg supported these changes, saying that the amount of censorship on the platform was excessive, the decision received criticism by fact-checking institutions, stating that the changes would make it more difficult for users to identify misinformation. Meta also faced criticism for weakening its policies on hate speech that were designed to protect minorities and LGBTQ+ individuals from bullying and discrimination. While moving its content review teams from California to Texas, Meta changed their hateful conduct policy to eliminate restrictions on anti-LGBT and anti-immigrant hate speech, as well as explicitly allowing users to accuse LGBT people of being mentally ill or abnormal based on their sexual orientation or gender identity. In January 2025, Meta faced significant criticism for its role in removing LGBTQ+ content from its platforms, amid its broader efforts to address anti-LGBTQ+ hate speech. The removal of LGBTQ+ themes was noted as part of the wider crackdown on content deemed to violate its community guidelines. Meta's content moderation policies, which were designed to combat harmful speech and protect users from discrimination, inadvertently led to the removal or restriction of LGBTQ+ content, particularly posts highlighting LGBTQ+ identities, support, or political issues. According to reports, LGBTQ+ posts, including those that simply celebrated pride or advocated for LGBTQ+ rights, were flagged and removed for reasons that some critics argue were vague or inconsistently applied. Many LGBTQ+ activists and users on Meta's platforms expressed concern that such actions stifled visibility and expression, potentially isolating LGBTQ+ individuals and communities, especially in spaces that were historically important for outreach and support. Lawsuits Numerous lawsuits have been filed against the company, both when it was known as Facebook, Inc., and as Meta Platforms. In March 2020, the Office of the Australian Information Commissioner (OAIC) sued Facebook, for significant and persistent infringements of the rule on privacy involving the Cambridge Analytica fiasco. Every violation of the Privacy Act is subject to a theoretical cumulative liability of $1.7 million. The OAIC estimated that a total of 311,127 Australians had been exposed. On December 8, 2020, the U.S. Federal Trade Commission and 46 states (excluding Alabama, Georgia, South Carolina, and South Dakota), the District of Columbia and the territory of Guam, launched Federal Trade Commission v. Facebook as an antitrust lawsuit against Facebook. The lawsuit concerns Facebook's acquisition of two competitors—Instagram and WhatsApp—and the ensuing monopolistic situation. FTC alleges that Facebook holds monopolistic power in the U.S. social networking market and seeks to force the company to divest from Instagram and WhatsApp to break up the conglomerate. William Kovacic, a former chairman of the Federal Trade Commission, argued the case will be difficult to win as it would require the government to create a counterfactual argument of an internet where the Facebook-WhatsApp-Instagram entity did not exist, and prove that harmed competition or consumers. In November 2025, it was ruled that Meta did not violate antitrust laws and holds no monopoly in the market. On December 24, 2021, a court in Russia fined Meta for $27 million after the company declined to remove unspecified banned content. The fine was reportedly tied to the company's annual revenue in the country. In May 2022, a lawsuit was filed in Kenya against Meta and its local outsourcing company Sama. Allegedly, Meta has poor working conditions in Kenya for workers moderating Facebook posts. According to the lawsuit, 260 screeners were declared redundant with confusing reasoning. The lawsuit seeks financial compensation and an order that outsourced moderators be given the same health benefits and pay scale as Meta employees. In June 2022, 8 lawsuits were filed across the U.S. over the allege that excessive exposure to platforms including Facebook and Instagram has led to attempted or actual suicides, eating disorders and sleeplessness, among other issues. The litigation follows a former Facebook employee's testimony in Congress that the company refused to take responsibility. The company noted that tools have been developed for parents to keep track of their children's activity on Instagram and set time limits, in addition to Meta's "Take a break" reminders. In addition, the company is providing resources specific to eating disorders as well as developing AI to prevent children under the age of 13 signing up for Facebook or Instagram. In June 2022, Meta settled a lawsuit with the US Department of Justice. The lawsuit, which was filed in 2019, alleged that the company enabled housing discrimination through targeted advertising, as it allowed homeowners and landlords to run housing ads excluding people based on sex, race, religion, and other characteristics. The U.S. Department of Justice stated that this was in violation of the Fair Housing Act. Meta was handed a penalty of $115,054 and given until December 31, 2022, to shadow the algorithm tool. In January 2023, Meta was fined €390 million for violations of the European Union General Data Protection Regulation. In May 2023, the European Data Protection Board fined Meta a record €1.2 billion for breaching European Union data privacy laws by transferring personal data of Facebook users to servers in the U.S. In July 2024, Meta agreed to pay the state of Texas US$1.4 billion to settle a lawsuit brought by Texas Attorney General Ken Paxton accusing the company of collecting users' biometric data without consent, setting a record for the largest privacy-related settlement ever obtained by a state attorney general. In October 2024, Meta Platforms faced lawsuits in Japan from 30 plaintiffs who claimed they were defrauded by fake investment ads on Facebook and Instagram, featuring false celebrity endorsements. The plaintiffs are seeking approximately $2.8 million in damages. In April 2025, the Kenyan High Court ruled that a US$2.4 billion lawsuit in which three plaintiffs claim that Facebook inflamed civil violence in Ethiopia in 2021 could proceed. In April 2025, Meta was fined €200 million ($230 million) for breaking the Digital Markets Act, by imposing a “consent or pay” system that forces users to either allow their personal data to be used to target advertisements, or pay a subscription fee for advertising-free versions of Facebook and Instagram. In late April 2025, a case was filed against Meta in Ghana over the alleged psychological distress experienced by content moderators employed to take down disturbing social media content including depictions of murders, extreme violence and child sexual abuse. Meta moved the moderation service to the Ghanaian capital of Accra after legal issues in the previous location Kenya. The new moderation company is Teleperformance, a multinational corporation with a history of worker's rights violation. Reports suggests the conditions are worse here than in the previous Kenyan location, with many workers afraid of speaking out due to fear of returning to conflict zones. Workers reported developing mental illnesses, attempted suicides, and low pay. In 26 January 2026, a New Mexico state court case was filed, suggesting that Mark Zuckerberg approved allowing minors to access artificial intelligence chatbot companions that safety staffers warned were capable of sexual interactions. In 2020, the company UReputation, which had been involved in several cases concerning the management of digital armies[clarification needed], filed a lawsuit against Facebook, accusing it of unlawfully transmitting personal data to third parties. Legal actions were initiated in Tunisia, France, and the United States. In 2025, the United States District court for the Northern District of Georgia approved a discovery procedure, allowing UReputation to access documents and evidence held by Meta. Structure Meta's key management consists of: As of October 2022[update], Meta had 83,553 employees worldwide. As of June 2024[update], Meta's board consisted of the following directors; Meta Platforms is mainly owned by institutional investors, who hold around 80% of all shares. Insiders control the majority of voting shares. The three largest individual investors in 2024 were Mark Zuckerberg, Sheryl Sandberg and Christopher K. Cox. The largest shareholders in late 2024/early 2025 were: Roger McNamee, an early Facebook investor and Zuckerberg's former mentor, said Facebook had "the most centralized decision-making structure I have ever encountered in a large company". Facebook co-founder Chris Hughes has stated that chief executive officer Mark Zuckerberg has too much power, that the company is now a monopoly, and that, as a result, it should be split into multiple smaller companies. In an op-ed in The New York Times, Hughes said he was concerned that Zuckerberg had surrounded himself with a team that did not challenge him, and that it is the U.S. government's job to hold him accountable and curb his "unchecked power". He also said that "Mark's power is unprecedented and un-American." Several U.S. politicians agreed with Hughes. European Union Commissioner for Competition Margrethe Vestager stated that splitting Facebook should be done only as "a remedy of the very last resort", and that it would not solve Facebook's underlying problems. Revenue Facebook ranked No. 34 in the 2020 Fortune 500 list of the largest United States corporations by revenue, with almost $86 billion in revenue most of it coming from advertising. One analysis of 2017 data determined that the company earned US$20.21 per user from advertising. According to New York, since its rebranding, Meta has reportedly lost $500 billion as a result of new privacy measures put in place by companies such as Apple and Google which prevents Meta from gathering users' data. In February 2015, Facebook announced it had reached two million active advertisers, with most of the gain coming from small businesses. An active advertiser was defined as an entity that had advertised on the Facebook platform in the last 28 days. In March 2016, Facebook announced it had reached three million active advertisers with more than 70% from outside the United States. Prices for advertising follow a variable pricing model based on auctioning ad placements, and potential engagement levels of the advertisement itself. Similar to other online advertising platforms like Google and Twitter, targeting of advertisements is one of the chief merits of digital advertising compared to traditional media. Marketing on Meta is employed through two methods based on the viewing habits, likes and shares, and purchasing data of the audience, namely targeted audiences and "look alike" audiences. The U.S. IRS challenged the valuation Facebook used when it transferred IP from the U.S. to Facebook Ireland (now Meta Platforms Ireland) in 2010 (which Facebook Ireland then revalued higher before charging out), as it was building its double Irish tax structure. The case is ongoing and Meta faces a potential fine of $3–5bn. The U.S. Tax Cuts and Jobs Act of 2017 changed Facebook's global tax calculations. Meta Platforms Ireland is subject to the U.S. GILTI tax of 10.5% on global intangible profits (i.e. Irish profits). On the basis that Meta Platforms Ireland Limited is paying some tax, the effective minimum US tax for Facebook Ireland will be circa 11%. In contrast, Meta Platforms Inc. would incur a special IP tax rate of 13.125% (the FDII rate) if its Irish business relocated to the U.S. Tax relief in the U.S. (21% vs. Irish at the GILTI rate) and accelerated capital expensing, would make this effective U.S. rate around 12%. The insignificance of the U.S./Irish tax difference was demonstrated when Facebook moved 1.5bn non-EU accounts to the U.S. to limit exposure to GDPR. Facilities Users outside of the U.S. and Canada contract with Meta's Irish subsidiary, Meta Platforms Ireland Limited (formerly Facebook Ireland Limited), allowing Meta to avoid US taxes for all users in Europe, Asia, Australia, Africa and South America. Meta is making use of the Double Irish arrangement which allows it to pay 2–3% corporation tax on all international revenue. In 2010, Facebook opened its fourth office, in Hyderabad, India, which houses online advertising and developer support teams and provides support to users and advertisers. In India, Meta is registered as Facebook India Online Services Pvt Ltd. It also has offices or planned sites in Chittagong, Bangladesh; Dublin, Ireland; and Austin, Texas, among other cities. Facebook opened its London headquarters in 2017 in Fitzrovia in central London. Facebook opened an office in Cambridge, Massachusetts in 2018. The offices were initially home to the "Connectivity Lab", a group focused on bringing Internet access to those who do not have access to the Internet. In April 2019, Facebook opened its Taiwan headquarters in Taipei. In March 2022, Meta opened new regional headquarters in Dubai. In September 2023, it was reported that Meta had paid £149m to British Land to break the lease on Triton Square London office. Meta reportedly had another 18 years left on its lease on the site. As of 2023, Facebook operated 21 data centers. It committed to purchase 100% renewable energy and to reduce its greenhouse gas emissions 75% by 2020. Its data center technologies include Fabric Aggregator, a distributed network system that accommodates larger regions and varied traffic patterns. Reception US Representative Alexandria Ocasio-Cortez responded in a tweet to Zuckerberg's announcement about Meta, saying: "Meta as in 'we are a cancer to democracy metastasizing into a global surveillance and propaganda machine for boosting authoritarian regimes and destroying civil society ... for profit!'" Ex-Facebook employee Frances Haugen and whistleblower behind the Facebook Papers responded to the rebranding efforts by expressing doubts about the company's ability to improve while led by Mark Zuckerberg, and urged the chief executive officer to resign. In November 2021, a video published by Inspired by Iceland went viral, in which a Zuckerberg look-alike promoted the Icelandverse, a place of "enhanced actual reality without silly looking headsets". In a December 2021 interview, SpaceX and Tesla chief executive officer Elon Musk said he could not see a compelling use-case for the VR-driven metaverse, adding: "I don't see someone strapping a frigging screen to their face all day." In January 2022, Louise Eccles of The Sunday Times logged into the metaverse with the intention of making a video guide. She wrote: Initially, my experience with the Oculus went well. I attended work meetings as an avatar and tried an exercise class set in the streets of Paris. The headset enabled me to feel the thrill of carving down mountains on a snowboard and the adrenaline rush of climbing a mountain without ropes. Yet switching to the social apps, where you mingle with strangers also using VR headsets, it was at times predatory and vile. Eccles described being sexually harassed by another user, as well as "accents from all over the world, American, Indian, English, Australian, using racist, sexist, homophobic and transphobic language". She also encountered users as young as 7 years old on the platform, despite Oculus headsets being intended for users over 13. See also References External links 37°29′06″N 122°08′54″W / 37.48500°N 122.14833°W / 37.48500; -122.14833 |
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[SOURCE: https://en.wikipedia.org/wiki/Contributor_License_Agreement] | [TOKENS: 968] |
Contents Contributor license agreement A Contributor License Agreement (CLA) defines the terms under which intellectual property has been contributed to a company/project, typically software under an open source license. Rationale CLAs can be used to enable vendors to easily pursue legal resolution in the case of copyright disputes, or to relicense products to which contributions have been received from third parties. CLAs are important especially for corporate open source projects under a copyleft license, since without a CLA the contribution would restrict the guardian as well. The purpose of a CLA is to ensure that the guardian of a project's outputs has the necessary ownership or grants of rights over all contributions to allow them to distribute under the chosen license, often by granting an irrevocable license to allow the project maintainer to use the contribution; if copyright is actually transferred, the agreement is more normally known as a Copyright Transfer Agreement. CLAs also have roles in raising awareness of IPR issues within a project. Relicensing controversy When a CLA requires a contributor to assign unrestricted republishing rights to the project, contributed code can be relicensed at the discretion of the project, even when the CLA does not assign copyright to the project. Prominent open source advocates regard CLAs as dangerous to open source rights. In 2019 MongoDB used these rights granted by its CLA to achieve a move to a non-open-source license. In January 2021, the Elasticsearch project used such rights to move the project to a non-open-source license arguing Amazon had been "misleading and confusing the community". [...] Our license change is aimed at preventing companies from taking our Elasticsearch and Kibana products and providing them directly as a service without collaborating with us. Our license change comes after years of what we believe to be Amazon/AWS misleading and confusing the community - enough is enough. We’ve tried every avenue available including going through the courts, but with AWS’s ongoing behavior, we have decided to change our license so that we can focus on building products and innovating rather than litigating [...] Drew DeVault, a lead developer with a number of open source projects such as Sway, regards this move as a loophole. Both these projects were licensed under a copyleft license, which uses copyright to protect contributions, yet the CLA negates the usefulness of copyright in achieving this protection: Elasticsearch belongs to its 1,573 contributors, who retain their copyright, and granted Elastic a license to distribute their work without restriction. This is the loophole which Elastic exploited when they decided that Elasticsearch would no longer be open source [...] CLAs which restrict relicensing Project Harmony was established by Canonical in 2010 to optionally avoid the problems discussed above. It provides a CLA template-builder. Based on choices made, the CLA will allow the contributor to keep copyright and assign rights to the project (as above) but with various restrictions on relicensing: using the template requires choosing one of the mutually-exclusive options, which range in restrictiveness. A real-world example is the Ubuntu project. The CLA leaves copyright with the contributor and allows the project to relicense the code but with a restriction based on the license the contribution was made under: 2.3 Outbound License Based on the grant of rights in Sections 2.1 and 2.2, if We include Your Contribution in a Material, We may license the Contribution under any license, including copyleft, permissive, commercial, or proprietary licenses. As a condition on the exercise of this right, We agree to also license the Contribution under the terms of the license or licenses which We are using for the Material on the Submission Date. The Fedora Project formerly required contributors to sign a CLA, either as an organization or as an individual. However, this was retired in 2011 and instead contributors must agree to the Fedora Project Contributor Agreement, which is not a license agreement and does not include assignment of copyright. Users Companies and projects that use CLAs include: KDE uses Free Software Foundation Europe's Fiduciary Licence Agreement of which (FLA-1.2) states in section 3.3: FSFE shall only exercise the granted rights and licences in accordance with the principles of Free Software as defined by the Free Software Foundations. FSFE guarantees to use the rights and licences transferred in strict accordance with the regulations imposed by Free Software licences, including, but not limited to, the GNU General Public Licence (GPL) or the GNU Lesser General Public Licence (LGPL) respectively. In the event FSFE violates the principles of Free Software, all granted rights and licences shall automatically return to the Beneficiary and the licences granted hereunder shall be terminated and expire. However, it is optional and every contributor is allowed not to assign their copyright to KDE e.V. See also References External links |
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[SOURCE: https://news.ycombinator.com/newcomments] | [TOKENS: 1708] |
By Rice's Theorem, I somehow doubt that. Learning from prior knowledge doesn't mean being capped by it. I’m guessing by using a residential botnet and using existing credentials by unknowingly ”victims” by automating their browsers. There might be similar safeguards for posting to external services, which might require confirmation or be performed by fresh subagents with sanitized, human-checkable prompts. Given they're "still finalizing the design and materials" and are not based in China, I think it's a safe bet that the first run will either be delayed or be an alpha. I wonder how you cool a 3x3cm die that outputs 2.5 kW of heat. In the article they mention that the traditional setup requires water cooling, but surely this does as well, right? It quite frankly breaks two guidelines: "promotional spam" and "original sourcing".From " Please don't use HN primarily for promotion. It's ok to post your own stuff part of the time, but the primary use of the site should be for curiosity."and"Please submit the original source. If a post reports on something found on another site, submit the latter."The moderators won't do anything because they are allowing it only for this blog. https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/item?id=46450908 From " Please don't use HN primarily for promotion. It's ok to post your own stuff part of the time, but the primary use of the site should be for curiosity."and"Please submit the original source. If a post reports on something found on another site, submit the latter."The moderators won't do anything because they are allowing it only for this blog. https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/item?id=46450908 " Please don't use HN primarily for promotion. It's ok to post your own stuff part of the time, but the primary use of the site should be for curiosity."and"Please submit the original source. If a post reports on something found on another site, submit the latter."The moderators won't do anything because they are allowing it only for this blog. https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/item?id=46450908 and"Please submit the original source. If a post reports on something found on another site, submit the latter."The moderators won't do anything because they are allowing it only for this blog. https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/item?id=46450908 "Please submit the original source. If a post reports on something found on another site, submit the latter."The moderators won't do anything because they are allowing it only for this blog. https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/item?id=46450908 The moderators won't do anything because they are allowing it only for this blog. https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/item?id=46450908 https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/item?id=46450908 https://news.ycombinator.com/item?id=46450908 I strongly doubt that this company runs their own weather stations or meteorological models. Their only recurring cost is API access to the companies that provide weather data, a negligible amount of IT infrastructure, and their employees. Considering that there are many free weather APIs, and that a polished frontend can be built by a single person, what exactly are the overheads?To be fair, I'm not criticizing the subscription model. I think it makes sense for software that needs to be continually maintained. But a weather app shouldn't have large maintenance costs that couldn't be covered by a one-time payment. A big reason why companies love the Apple ecosystem is because subscriptions have been normalized, and users are used to paying them regardless if the model actually makes sense for the type of software. To be fair, I'm not criticizing the subscription model. I think it makes sense for software that needs to be continually maintained. But a weather app shouldn't have large maintenance costs that couldn't be covered by a one-time payment. A big reason why companies love the Apple ecosystem is because subscriptions have been normalized, and users are used to paying them regardless if the model actually makes sense for the type of software. I'm not saying it is perfect, but it was not that bad, really. It's only one level down. And then you could also use a keyboard shortcut for it, which is always faster than anything mouse-driven if your hands are on the keyboard, which they would be, if you wanted to type a URL.And even if you had to use the mouse, there is an interface feature we have lost: tear-off menus. If you found that you needed something in a nested menu often, you could simply tear-off that submenu and pin it on your desktop so you can always have direct access. And even if you had to use the mouse, there is an interface feature we have lost: tear-off menus. If you found that you needed something in a nested menu often, you could simply tear-off that submenu and pin it on your desktop so you can always have direct access. As such, a new codebase is likely to grow by large unwieldy commits and a mature one by targetted small commits. But no, because electors deciding how they cast their votes is a matter of state legislation, not federal, and it is a wildly different thing than the candidate himself trying to install fake electors.The faithless electors were chosen as part of the political process, and the founders expressly stated that the electors having the freedom to cast their vote was part of the safeguard against mob rule by an uninformed electorate. Hamilton, for example, wrote extensively of this in the federalist papers.Meanwhile Trump explicitly worked to install a group of illegally selected electors while riling up a mob to attempt to put a halt to the certification.Trying to compare electors casting their vote based on how the founding fathers envisioned the electoral college as working to a sitting president being involved in a coordinated effort to create and install fake electors, cause the certification of the election to fail by inciting a mob to storm the capitol, and oh, telling Georgia to "find me the votes" is absurd. The faithless electors were chosen as part of the political process, and the founders expressly stated that the electors having the freedom to cast their vote was part of the safeguard against mob rule by an uninformed electorate. Hamilton, for example, wrote extensively of this in the federalist papers.Meanwhile Trump explicitly worked to install a group of illegally selected electors while riling up a mob to attempt to put a halt to the certification.Trying to compare electors casting their vote based on how the founding fathers envisioned the electoral college as working to a sitting president being involved in a coordinated effort to create and install fake electors, cause the certification of the election to fail by inciting a mob to storm the capitol, and oh, telling Georgia to "find me the votes" is absurd. Meanwhile Trump explicitly worked to install a group of illegally selected electors while riling up a mob to attempt to put a halt to the certification.Trying to compare electors casting their vote based on how the founding fathers envisioned the electoral college as working to a sitting president being involved in a coordinated effort to create and install fake electors, cause the certification of the election to fail by inciting a mob to storm the capitol, and oh, telling Georgia to "find me the votes" is absurd. Trying to compare electors casting their vote based on how the founding fathers envisioned the electoral college as working to a sitting president being involved in a coordinated effort to create and install fake electors, cause the certification of the election to fail by inciting a mob to storm the capitol, and oh, telling Georgia to "find me the votes" is absurd. The price is reasonable I guess, but also, you can just get weather for free? IDK... |
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[SOURCE: https://en.wikipedia.org/wiki/Book_of_Ezra] | [TOKENS: 1999] |
Contents Book of Ezra The Book of Ezra is a book of the Hebrew Bible which formerly included the Book of Nehemiah in a single book, commonly distinguished in scholarship as Ezra–Nehemiah. The two became separated with the first printed rabbinic bibles of the early 16th century, following late medieval Latin Christian tradition. Composed in Hebrew and Aramaic, its subject is the Return to Zion following the close of the Babylonian captivity. Together with the Book of Nehemiah, it represents the final chapter in the historical narrative of the Hebrew Bible. The Book of Ezra is divided into two parts: the first telling the story of the first return of exiles in the first year of Cyrus the Great (538 BC) and the completion and dedication of the new Temple in Jerusalem in the sixth year of Darius I (515 BC); the second telling of the subsequent mission of Ezra to Jerusalem and his struggle to purify the Jews from marriage with non-Jews. In the book's recurring narrative pattern, the God of Israel three times inspires a king of Persia to commission a leader from among the Jews to carry out a mission: the first to rebuild the Temple, the second to purify the Jewish community, and the third to seal the holy city behind a wall. This third mission, that of Nehemiah, is not part of the Book of Ezra. There is no historical consensus on Ezra's existence or mission due to a lack of extrabiblical evidence and conflicting scholarly interpretations, ranging from viewing him as a historical Aramean official to a literary figure, with debates hinging on the authenticity of the Artaxerxes rescript and its dating. Summary The Book of Ezra consists of ten chapters: chapters 1–6, covering the period from the decree of Cyrus the Great to the dedication of the Second Temple, are told in the third person. Chapters 7–10, dealing with the mission of Ezra, are told largely in the first person. The book contains several documents presented as historical inclusions, written in Aramaic while the surrounding text is in Hebrew (1:2–4, 4:8–16, 4:17–22, 5:7–17, 6:3–5, 6:6–12, 7:12–26) Historical background In the early 6th century BC, the Kingdom of Judah rebelled against the Neo-Babylonian Empire and was destroyed. As a result, the royal court, the priests, the prophets, and the scribes were taken into captivity in the city of Babylon. There, a profound intellectual revolution took place, the exiles blaming their fate on disobedience to their God and looking forward to a future when he would allow a purified people to return to Jerusalem and rebuild the Temple in Jerusalem. The same period saw the rapid rise of Persia, previously an unimportant kingdom in present-day southern Iran, to a position of great power, and in 539 BC Cyrus II, the Persian ruler, conquered Babylon. It is difficult to describe the parties and politics of Judea in this period because of the lack of historical sources, but there seem to have been three important groups involved: the returnees from the exile who claimed the reconstruction with the support of Cyrus II; "the adversaries of Judah and Benjamin"; and a third group, "people of the land", who seem to be local opposition against the returnees building the Temple in Jerusalem. The following table is a guide to major events in the region during the period covered by the Book of Ezra: Texts The single Hebrew book Ezra–Nehemiah, with title "Ezra", was translated into Greek around the middle of the 2nd century BC. The Septuagint names Ezra–Nehemiah and 1 Esdras Esdras B and A respectively. This usage is noted by the early Christian scholar Origen, who remarked that the Hebrew 'book of Ezra' might then be considered a 'double' book. Jerome, writing in the early 5th century, noted that this duplication had since been adopted by Greek and Latin Christians. Jerome himself rejected the duplication in his Vulgate translation of the Bible into Latin from the Hebrew. Consequently, all early Vulgate manuscripts present Ezra-Nehemiah as a single book. From the 9th century onwards, Latin bibles are found that for the first time separate the Ezra and Nehemiah sections of Ezra-Nehemiah as two distinct books, then called the first and second books of Ezra. This becomes standard in the Paris Bibles of the 13th century. It was not until 1516/17, in the first printed Rabbinic Bible of Daniel Bomberg that the separation was introduced generally in Hebrew Bibles. 1 Esdras, also known as "Esdras α", is an alternate Greek-language version of Ezra. This text has one additional section, the 'Tale of the Three Guardsmen' in the middle of Ezra 4. 1 Esdras (3 Esdras in the Vulgate) was considered apocryphal by Jerome. Date, structure and composition Koresh of Ezra 1:1 is called "king of Persia" (מלך פרס Melekh Pāras); the title was introduced by Cyrus the Great sometime after he defeated Astyages of Media (585–550 BC). Scholars are divided over the chronological sequence of the activities of Ezra and Nehemiah. Ezra 7:8 says that Ezra arrived in Jerusalem in the seventh year of King Artaxerxes, while Nehemiah 2:1–9 has Nehemiah arriving in Artaxerxes' twentieth year. If this was Artaxerxes I (465–424 BC), then Ezra arrived in 458 and Nehemiah in 445 BC. Nehemiah 8–9, in which the two (possibly by editorial error) appear together, supports this scenario. The contents of Ezra–Nehemiah are structured in a theological rather than chronological order: "The Temple must come first, then the purifying of the community, then the building of the outer walls of the city, and so finally all could reach a grand climax in the reading of the law." The narrative follows a repeating pattern in which the God of Israel "stirs up" the king of Persia to commission a Jewish leader (Zerubbabel, Ezra, Nehemiah) to undertake a mission; the leader completes his mission in the face of opposition, and success is marked by a great assembly. The tasks of the three leaders are progressive: first the Temple is restored (Zerubabbel), then the community of Israel (Ezra), and finally the walls which will separate the purified community and Temple from the outside world (Nehemiah). The pattern is completed with a final coda in which Nehemiah restores belief in Yahweh. This concern with a schematic pattern-making, rather than with history in the modern sense of a factual account of events in the order in which they occurred, explains the origin of the many problems which surround both Ezra and Nehemiah as historical sources. Twentieth-century views on the composition of Ezra revolved around whether the author was Ezra himself, and who may have also authored the Books of Chronicles, or was another author or authors who also wrote the Chronicles. More recently it has been increasingly recognised that Ezra, Nehemiah and Chronicles all have extremely complex histories stretching over many stages of editing, and most scholars now are cautious of assuming a unified composition with a single theology and point of view. As an indication of the many layers of editing which Ezra has undergone, one recent study finds that Ezra 1–6 and Ezra 9–10 were originally separate documents, that they were spliced together at a later stage by the authors of Ezra 7–8, and that all have undergone extensive later editing. Tamara Cohn Eskenazi argues that the final composition of Ezra took place during the late Persian period (c. 370–350 BCE), with some small additions from the Hellenistic period. She states that the language and ideology of the book seem to best fit within a Persian-period context. Manuscripts The oldest surviving manuscript of Ezra is 4QEzra, also called 4Q117; it contains Ezra 4:2–6, 9–11; 5:17; 6:1–5. It dates to the Hasmonean period (140–37 BC). A 7th-century Egyptian ostracon contains a fragmentary text of the Septuagint (Greek translation): 1 Esdras 2:10, 9:21–24. A Vulgar Latin translation is found in the Codex Amiatinus (8th century). The Hebrew text in full is found in the Aleppo Codex (10th century) and Leningrad Codex (11th century). Persian documents Seven purported Persian decrees of kings or letters to and from high officials are quoted in Ezra. Their authenticity has been contentious. While some scholars accept them in their current form, most accept only part of them as genuine, while still others reject them entirely. L.L. Grabbe surveyed six tests against which the documents can be measured (comparative known Persian material, linguistic details, contents, presence of Jewish theology, the Persian attitude to local religions, and Persian letter-writing formulas) and concluded that all the documents are late post-Persian works and probable forgeries, but that some features suggest a genuine Persian correspondence behind some of them. By contrast, Richard C. Steiner and H. G. M. Williamson argue that the linguistic and other evidence suggests that the documents are authentic. See also References External links Commentaries Translations |
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[SOURCE: https://en.wikipedia.org/wiki/Copyleft] | [TOKENS: 4202] |
Contents Copyleft Higher categories: Software, freedom Copyleft is the legal technique of granting certain freedoms over copies of copyrighted works with the requirement that the same rights be preserved in derivative works. In this sense, freedoms refers to the use of the work for any purpose, and the ability to modify, copy, share, and redistribute the work, with or without a fee. Licenses which implement copyleft can be used to maintain copyright conditions for works ranging from computer software, to documents, art, and scientific discoveries. Similar approaches have been applied to certain patents. Copyleft software licenses are considered protective or reciprocal (in contrast with permissive free software licenses): they require that information necessary for reproducing and modifying the work be made available to recipients of the software program.[citation needed] This information is most commonly in the form of source code files, which usually contain a copy of the license terms and acknowledge the authors of the code. Copyleft helps ensure everyone's rights to freely use the product but it prohibits owning, registering copyright and earning royalties from copyright. Notable copyleft licenses include the GNU General Public License (GPL), originally written by Richard Stallman, which was the first software copyleft license to see extensive use; the Mozilla Public License; the Free Art License; and the Creative Commons share-alike license condition—with the last two intended for non-software works, such as documents and pictures, both academic or artistic in nature. Wikipedia is copyleft under the Creative Commons Attribution-ShareAlike license. History Li-Chen Wang's Palo Alto Tiny BASIC for the Intel 8080 appeared in Dr. Dobb's Journal in May 1976. The listing begins with the title, author's name, and date, but also has "@COPYLEFT ALL WRONGS RESERVED". The concept of copyleft was described in Richard Stallman's GNU Manifesto in 1985, where he wrote: GNU is not in the public domain. Everyone will be permitted to modify and redistribute GNU, but no distributor will be allowed to restrict its further redistribution. That is to say, proprietary modifications will not be allowed. I want to make sure that all versions of GNU remain free. Stallman's motivation was that a few years earlier he had worked on a Lisp interpreter. Symbolics asked to use the Lisp interpreter, and Stallman agreed to supply them with a public domain version of his work. Symbolics extended and improved the Lisp interpreter, but when Stallman wanted access to the improvements that Symbolics had made to his interpreter, Symbolics refused. Stallman then, in 1984, proceeded to work towards eradicating this emerging behavior and culture of proprietary software, which he named software hoarding. This was not the first time Stallman had dealt with proprietary software, but he deemed this interaction a "turning point". He justified software sharing, protesting that when sharing, the software online can be copied without the loss of the original piece of work. The software can be used multiple times without ever being damaged or worn out. As Stallman deemed it impractical in the short term to eliminate current copyright law and the wrongs he perceived it to perpetuate, he decided to work within the framework of existing law; in 1985, he created his own copyright license, the Emacs General Public License, the first copyleft license. This later evolved into the GNU General Public License, which is now one of the most popular free-software licenses. For the first time, a copyright holder had taken steps to ensure that the maximal number of rights be perpetually transferred to a program's users, no matter what subsequent revisions anyone made to the original program. This original GPL did not grant rights to the public at large, only those who had already received the program; but it was the best that could be done under existing law. The new license was not at this time given the copyleft label. Richard Stallman stated that the use of "Copyleft" comes from Don Hopkins, who mailed him a letter in 1984 or 1985, on which was written: "Copyleft – all rights reversed", which is a pun on the common copyright disclaimer "all rights reserved". In France, a series of meetings taking place in 2000 under the title "Copyleft Attitude" gave birth to the Free Art License (FAL), theoretically valid in any jurisdiction bound by the Berne Convention and recommended by Stallman's own Free Software Foundation. Shortly thereafter, a separate, unrelated initiative in the United States yielded the Creative Commons license, available since 2001 in both permissive (BY) and copyleft (BY-SA) variants and more specifically tailored to US law. Copyleft principles While copyright law gives software authors control over copying, distribution and modification of their works, the goal of copyleft is to give all users of the work the freedom to carry out all of these activities. The Free Software Definition lists "four essential freedoms" of software use: Similar terms are present in the Open Source Definition, a separate definition that contains similar freedoms. The vast majority of copyleft licenses satisfy both definitions, that of the Free Software Definition and Open Source Definition. By guaranteeing viewers and users of a work the freedom and permission to reproduce, adapt, or distribute it, copyleft licenses are distinct from other types of copyright licenses that limit such freedoms. Instead of allowing a work to fall completely into the public domain, where no ownership of copyright is claimed, copyleft allows authors to impose restrictions on the use of their work. One of the main restrictions imposed by copyleft is that derived works must also be released under a compatible copyleft license. This is due to the underlying principle of copyleft: that anyone can benefit freely from the previous work of others, but that any modifications to that work should benefit everyone else as well, and thus must be released under similar terms. For this reason, copyleft licenses are also known as reciprocal licenses: any modifiers of a copyleft-licensed work are expected to reciprocate the author's action of copyleft-licensing the software by also copyleft-licensing any derivatives they might have made. Because of this requirement, copyleft licenses have also been described as "viral" due to their self-perpetuating terms. In addition to restrictions on copying, copyleft licenses address other possible impediments. They ensure that rights cannot be later revoked, and require the work and its derivatives to be provided in a form that allows further modifications to be made. In software, this means requiring that the source code of the derived work be made available together with the software itself. The economic incentives to work on copyleft content can vary. Traditional copyright law is designed to promote progress by providing economic benefits to creators. When choosing to copyleft their work, content creators may seek complementary benefits like recognition from their peers. In the world of computer programming, copyleft-licensed computer programs are often created by programmers to fill a need they have noticed. Such programs are often published with a copyleft license simply to ensure that subsequent users can also freely use modified versions of that program. This is especially true for creators who wish to prevent "open source hijacking", or the act of reusing open-source code and then adding extra restrictions to it, an action prevented by copyleft-licensing the software. Some creators, such as Elastic, feel that preventing commercial enterprises from using and then selling their product under a proprietary license is also an incentive. Furthermore, the open-source culture of programming has been described as a gift economy, where social power is determined by an individual's contributions. Contributing to or creating open-source, copyleft-licensed software of high quality can lead to contributors gaining valuable experience and can lead to future career opportunities. Copyleft software has economic effects beyond individual creators. The presence of quality copyleft software can force proprietary software developers to increase the quality of their software to compete with free software. This may also have the effect of preventing monopolies in areas dominated by proprietary software. However, competition with proprietary software can also be a reason to forgo copyleft. The Free Software Foundation recommends that when "widespread use of the code is vital for advancing the cause of free software", allowing the code to be copied and used freely is more important than a copyleft. Copyleft application Common practice for using copyleft is to codify the copying terms for a work with a license. Any such license typically includes all the provisions and principles of copyleft inside the license's terms. This includes the freedom to use the work, study the work, copy, and share the work with others, modify the work, and distribute exact or modified versions of that work, with or without a fee. Unlike similar permissive licenses that also grant these freedoms, copyleft licenses also ensure that any modified versions of a work covered by a copyleft license must also grant these freedoms. Thus, copyleft licenses have conditions: that modifications of any work licensed under a copyleft license must be distributed under a compatible copyleft scheme and that the distributed modified work must include a means of modifying the work. Under fair use, however, copyleft licenses may be superseded, just like regular copyrights. Therefore, any person utilizing a source licensed under a copyleft license for works they invent is free to choose any other license (or none at all) provided they meet the fair use standard. Copyleft licenses necessarily make creative use of relevant rules and laws to enforce their provisions. For example, when using copyright law, those who contribute to a work under copyleft usually must gain, defer, or assign copyright holder status.[citation needed] By submitting the copyright of their contributions under a copyleft license, they deliberately give up some of the rights that normally follow from copyright, including the right to be the unique distributor of copies of the work. Some laws used for copyleft licenses vary from one country to another, and may also be granted in terms that vary from country to country. For example, in some countries, it is acceptable to sell a software product without warranty (in standard GNU General Public License style), while in most European countries it is not permitted for a software distributor to waive all warranties regarding a sold product.[citation needed] For this reason, the extent of such warranties is specified in most European copyleft licenses, such as the European Union Public Licence (EUPL) or the CeCILL license, that latter of which is a license that allows one to use GNU GPL code in combination with a limited warranty. For projects which will be run over a network, a variation of the GNU GPL, called the Affero General Public License (GNU AGPL), ensures that the source code is available to users of software over a network. Types and relation to other licenses Copyleft is a distinguishing feature of some free software licenses, while other free-software licenses are not copyleft licenses because they do not require the licensee to distribute derivative works under the same license. There is an ongoing debate as to which class of license provides the greater degree of freedom. This debate hinges on complex issues, such as the definition of freedom and whose freedoms are more important: the potential future recipients of a work (freedom from proprietization) or just the initial recipient (freedom to proprietize). However, current copyright law and the availability of both types of licenses, copyleft and permissive, allow authors to choose the type under which to license the works they invent. For documents, art, and other works other than software and code, the Creative Commons share-alike licensing system and the GNU Free Documentation License (GFDL) allow authors to apply limitations to certain sections of their work, exempting some parts of the work from the full copyleft mechanism. In the case of the GFDL, these limitations include the use of invariant sections, which may not be altered by future editors. The initial intention of the GFDL was as a device for supporting the documentation of copylefted software. However, the result is that it can be used for any kind of document. The strength of the copyleft license governing a work is determined by the extent to which its provisions can be imposed on all kinds of derivative works. Thus, the term "weak copyleft" refers to licenses where not all derivative works inherit the copyleft license; whether a derivative work inherits or not often depends on how it was derived. "Weak copyleft" licenses are often used to cover software libraries. This allows other software to link to the library and be redistributed without the requirement for the linking software to also be licensed under the same terms. Only changes to the software licensed under a "weak copyleft" license become subject itself to copyleft provisions of such a license. This allows programs of any license to be compiled and linked against copylefted libraries such as glibc and then redistributed without any re-licensing required. The concrete effect of strong vs. weak copyleft has yet to be tested in court. Free-software licenses that use "weak" copyleft include the GNU Lesser General Public License and the Mozilla Public License. The GNU General Public License is an example of a license implementing strong copyleft. An even stronger copyleft license is the AGPL, which requires the publishing of the source code for software as a service use cases. The European Union Public Licence (EUPL), which also covers software as a service use cases, claims to be reasonably copyleft: strong on the original covered work, but weaker on combined derivative works. When the covered code is merged with code distributed under a compatible license, the latter may be used. When the combination is obtained by linking, it has — according to the Computer Programs Directive that is always applicable to the EUPL — no viral impact on linked components licenses.[citation needed] The Sybase Open Watcom Public License is one of the strongest copyleft licenses, as this license also requires the publishing of source code used for private use cases. For this reason, the license is considered non-free by the Free Software Foundation, the GNU Project,[citation needed] and the Debian project.[citation needed] However, the license is accepted as open source by the OSI.[citation needed] The Design Science License (DSL) is a strong copyleft license that applies to any work, not only software or documentation, but also literature, artworks, music, photography, and video. DSL was written by Michael Stutz after he took an interest in applying GNU-style copyleft to non-software works, which later came to be called libre works. In the 1990s, it was used on music recordings, visual art, and even novels. It is not considered compatible with the GNU GPL by the Free Software Foundation. "Full" and "partial" copyleft relate to another issue. Full copyleft exists when all parts of a work (except the license itself) may only be modified and distributed under the terms of the work's copyleft license. Partial copyleft, by contrast, exempts some parts of the work from the copyleft provisions, permitting distribution of some modifications under terms other than the copyleft license, or in some other way does not impose all the principles of copylefting on the work. Examples of partial copyleft are the GPL linking exception made for some software packages and the EUPL for combined derivatives. The "share-alike" condition in some licenses imposes the requirement that any freedom that is granted regarding the original work must be granted on exactly the same or compatible terms in any derived work. This implies that any copyleft license is automatically a share-alike license but not the other way around, as some share-alike licenses include further restrictions such as prohibiting commercial use. Another restriction is that not everyone wants to share their work, and some share-alike agreements require that the whole body of work be shared, even if the author only wants to share a certain part. The plus side for an author of source code is that any modification to the code will not only benefit the original author but that the author will be recognized and ensure the same or compatible license terms cover the changed code. Some Creative Commons licenses are examples of share-alike copyleft licenses. Those licenses grant users of the software the same freedoms as copyleft licenses but do not require modified versions of that software to also include those freedoms. They have minimal restrictions on how the software can be used, modified, and redistributed, and are thus not copyleft licenses. Examples of this type of license include the X11 license, Apache license, Expat license, and the various BSD licenses. Debate and controversy It has been suggested that copyleft has become a divisive issue in the ideological strife between the Open Source Initiative and the free software movement. However, there is evidence that copyleft is both accepted and proposed by both parties: "Viral license" is a pejorative name for copyleft licenses. It originates from the terms 'General Public Virus' or 'GNU Public Virus' (GPV), which dates back to 1990, a year after the GPLv1 was released. The name 'viral license' refers to the fact that any works derived from a copyleft work must preserve the copyleft permissions when distributed. Some advocates of the various BSD Licenses used the term derisively in regards to the GPL's tendency to absorb BSD-licensed code without allowing the original BSD work to benefit from it, while at the same time promoting itself as "freer" than other licenses. Microsoft vice-president Craig Mundie remarked in 2001, "This viral aspect of the GPL poses a threat to the intellectual property of any organization making use of it." In another context, Steve Ballmer declared that code released under GPL is useless to the commercial sector, since it can only be used if the resulting surrounding code is licensed under a GPL-compatible license, and described it thus as "a cancer that attaches itself in an intellectual property sense to everything it touches". In response to Microsoft's attacks on the GPL, several prominent free-software developers and advocates released a joint statement supporting the license. According to FSF compliance engineer David Turner, the term "viral license" creates a misunderstanding and a fear of using copylefted free software. While a person can catch a virus without active action, license conditions take effect upon effective usage or adoption. David McGowan has also written that there is no reason to believe the GPL could force proprietary software to become free software, but could "try to enjoin the firm from distributing commercially a program that combined with the GPL'd code to form a derivative work, and to recover damages for infringement." If the firm "actually copied code from a GPL'd program, such a suit would be a perfectly ordinary assertion of copyright, which most private firms would defend if the shoe were on the other foot." Richard Stallman has described this view with an analogy, saying, "The GPL's domain does not spread by proximity or contact, only by deliberate inclusion of GPL-covered code in your program. It spreads like a spider plant, not like a virus." According to Patrice-Emmanuel Schmitz, who contributed to the EUPL, viral licensing between independent programs does not exist under European law. Popular copyleft licenses, such as the GPL, have a clause allowing components to interact with non-copyleft components as long as the communication is abstract,[failed verification] such as executing a command-line tool with a set of switches or interacting with a web server. As a consequence, even if one module of an otherwise non-copyleft product is placed under the GPL, it may still be legal for other components to communicate with it in ways such as these.[clarification needed] This allowed communication may or may not include reusing libraries or routines via dynamic linking – some commentators say it does, the FSF asserts it does not and explicitly adds an exception allowing it in the license for the GNU Classpath re-implementation of the Java library. This ambiguity is an important difference between the GPL and the LGPL, in that the LGPL specifically allows linking or compiling works licensed under terms that are not compatible with the LGPL, with works covered by the LGPL. Symbol The copyleft symbol is a mirrored version of the copyright symbol, ©: a reversed C in a circle. A 2016 proposal to add the symbol to a future version of Unicode was accepted by the Unicode Technical Committee. The code point U+1F12F 🄯 COPYLEFT SYMBOL was added in Unicode 11. The copyleft symbol has no legal status. As of 2024,[update] the symbol is generally provided as standard in the system fonts of most current operating systems,[citation needed] but if need be it may be approximated with character U+2184 ↄ LATIN SMALL LETTER REVERSED C between parenthesis (ɔ). See also References External links |
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Contents Elon Musk Elon Reeve Musk (/ˈiːlɒn/ EE-lon; born June 28, 1971) is a businessman and entrepreneur known for his leadership of Tesla, SpaceX, Twitter, and xAI. Musk has been the wealthiest person in the world since 2025; as of February 2026,[update] Forbes estimates his net worth to be around US$852 billion. Born into a wealthy family in Pretoria, South Africa, Musk emigrated in 1989 to Canada; he has Canadian citizenship since his mother was born there. He received bachelor's degrees in 1997 from the University of Pennsylvania before moving to California to pursue business ventures. In 1995, Musk co-founded the software company Zip2. Following its sale in 1999, he co-founded X.com, an online payment company that later merged to form PayPal, which was acquired by eBay in 2002. Musk also became an American citizen in 2002. In 2002, Musk founded the space technology company SpaceX, becoming its CEO and chief engineer; the company has since led innovations in reusable rockets and commercial spaceflight. Musk joined the automaker Tesla as an early investor in 2004 and became its CEO and product architect in 2008; it has since become a leader in electric vehicles. In 2015, he co-founded OpenAI to advance artificial intelligence (AI) research, but later left; growing discontent with the organization's direction and their leadership in the AI boom in the 2020s led him to establish xAI, which became a subsidiary of SpaceX in 2026. In 2022, he acquired the social network Twitter, implementing significant changes, and rebranding it as X in 2023. His other businesses include the neurotechnology company Neuralink, which he co-founded in 2016, and the tunneling company the Boring Company, which he founded in 2017. In November 2025, a Tesla pay package worth $1 trillion for Musk was approved, which he is to receive over 10 years if he meets specific goals. Musk was the largest donor in the 2024 U.S. presidential election, where he supported Donald Trump. After Trump was inaugurated as president in early 2025, Musk served as Senior Advisor to the President and as the de facto head of the Department of Government Efficiency (DOGE). After a public feud with Trump, Musk left the Trump administration and returned to managing his companies. Musk is a supporter of global far-right figures, causes, and political parties. His political activities, views, and statements have made him a polarizing figure. Musk has been criticized for COVID-19 misinformation, promoting conspiracy theories, and affirming antisemitic, racist, and transphobic comments. His acquisition of Twitter was controversial due to a subsequent increase in hate speech and the spread of misinformation on the service, following his pledge to decrease censorship. His role in the second Trump administration attracted public backlash, particularly in response to DOGE. The emails he sent to Jeffrey Epstein are included in the Epstein files, which were published between 2025–26 and became a topic of worldwide debate. Early life Elon Reeve Musk was born on June 28, 1971, in Pretoria, South Africa's administrative capital. He is of British and Pennsylvania Dutch ancestry. His mother, Maye (née Haldeman), is a model and dietitian born in Saskatchewan, Canada, and raised in South Africa. Musk therefore holds both South African and Canadian citizenship from birth. His father, Errol Musk, is a South African electromechanical engineer, pilot, sailor, consultant, emerald dealer, and property developer, who partly owned a rental lodge at Timbavati Private Nature Reserve. His maternal grandfather, Joshua N. Haldeman, who died in a plane crash when Elon was a toddler, was an American-born Canadian chiropractor, aviator and political activist in the technocracy movement who moved to South Africa in 1950. Elon has a younger brother, Kimbal, a younger sister, Tosca, and four paternal half-siblings. Musk was baptized as a child in the Anglican Church of Southern Africa. Despite both Elon and Errol previously stating that Errol was a part owner of a Zambian emerald mine, in 2023, Errol recounted that the deal he made was to receive "a portion of the emeralds produced at three small mines". Errol was elected to the Pretoria City Council as a representative of the anti-apartheid Progressive Party and has said that his children shared their father's dislike of apartheid. After his parents divorced in 1979, Elon, aged around 9, chose to live with his father because Errol Musk had an Encyclopædia Britannica and a computer. Elon later regretted his decision and became estranged from his father. Elon has recounted trips to a wilderness school that he described as a "paramilitary Lord of the Flies" where "bullying was a virtue" and children were encouraged to fight over rations. In one incident, after an altercation with a fellow pupil, Elon was thrown down concrete steps and beaten severely, leading to him being hospitalized for his injuries. Elon described his father berating him after he was discharged from the hospital. Errol denied berating Elon and claimed, "The [other] boy had just lost his father to suicide, and Elon had called him stupid. Elon had a tendency to call people stupid. How could I possibly blame that child?" Elon was an enthusiastic reader of books, and had attributed his success in part to having read The Lord of the Rings, the Foundation series, and The Hitchhiker's Guide to the Galaxy. At age ten, he developed an interest in computing and video games, teaching himself how to program from the VIC-20 user manual. At age twelve, Elon sold his BASIC-based game Blastar to PC and Office Technology magazine for approximately $500 (equivalent to $1,600 in 2025). Musk attended Waterkloof House Preparatory School, Bryanston High School, and then Pretoria Boys High School, where he graduated. Musk was a decent but unexceptional student, earning a 61/100 in Afrikaans and a B on his senior math certification. Musk applied for a Canadian passport through his Canadian-born mother to avoid South Africa's mandatory military service, which would have forced him to participate in the apartheid regime, as well as to ease his path to immigration to the United States. While waiting for his application to be processed, he attended the University of Pretoria for five months. Musk arrived in Canada in June 1989, connected with a second cousin in Saskatchewan, and worked odd jobs, including at a farm and a lumber mill. In 1990, he entered Queen's University in Kingston, Ontario. Two years later, he transferred to the University of Pennsylvania, where he studied until 1995. Although Musk has said that he earned his degrees in 1995, the University of Pennsylvania did not award them until 1997 – a Bachelor of Arts in physics and a Bachelor of Science in economics from the university's Wharton School. He reportedly hosted large, ticketed house parties to help pay for tuition, and wrote a business plan for an electronic book-scanning service similar to Google Books. In 1994, Musk held two internships in Silicon Valley: one at energy storage startup Pinnacle Research Institute, which investigated electrolytic supercapacitors for energy storage, and another at Palo Alto–based startup Rocket Science Games. In 1995, he was accepted to a graduate program in materials science at Stanford University, but did not enroll. Musk decided to join the Internet boom of the 1990s, applying for a job at Netscape, to which he reportedly never received a response. The Washington Post reported that Musk lacked legal authorization to remain and work in the United States after failing to enroll at Stanford. In response, Musk said he was allowed to work at that time and that his student visa transitioned to an H1-B. According to numerous former business associates and shareholders, Musk said he was on a student visa at the time. Business career In 1995, Musk, his brother Kimbal, and Greg Kouri founded the web software company Zip2 with funding from a group of angel investors. They housed the venture at a small rented office in Palo Alto. Replying to Rolling Stone, Musk denounced the notion that they started their company with funds borrowed from Errol Musk, but in a tweet, he recognized that his father contributed 10% of a later funding round. The company developed and marketed an Internet city guide for the newspaper publishing industry, with maps, directions, and yellow pages. According to Musk, "The website was up during the day and I was coding it at night, seven days a week, all the time." To impress investors, Musk built a large plastic structure around a standard computer to create the impression that Zip2 was powered by a small supercomputer. The Musk brothers obtained contracts with The New York Times and the Chicago Tribune, and persuaded the board of directors to abandon plans for a merger with CitySearch. Musk's attempts to become CEO were thwarted by the board. Compaq acquired Zip2 for $307 million in cash in February 1999 (equivalent to $590,000,000 in 2025), and Musk received $22 million (equivalent to $43,000,000 in 2025) for his 7-percent share. In 1999, Musk co-founded X.com, an online financial services and e-mail payment company. The startup was one of the first federally insured online banks, and, in its initial months of operation, over 200,000 customers joined the service. The company's investors regarded Musk as inexperienced and replaced him with Intuit CEO Bill Harris by the end of the year. The following year, X.com merged with online bank Confinity to avoid competition. Founded by Max Levchin and Peter Thiel, Confinity had its own money-transfer service, PayPal, which was more popular than X.com's service. Within the merged company, Musk returned as CEO. Musk's preference for Microsoft software over Unix created a rift in the company and caused Thiel to resign. Due to resulting technological issues and lack of a cohesive business model, the board ousted Musk and replaced him with Thiel in 2000.[b] Under Thiel, the company focused on the PayPal service and was renamed PayPal in 2001. In 2002, PayPal was acquired by eBay for $1.5 billion (equivalent to $2,700,000,000 in 2025) in stock, of which Musk—the largest shareholder with 11.72% of shares—received $175.8 million (equivalent to $320,000,000 in 2025). In 2017, Musk purchased the domain X.com from PayPal for an undisclosed amount, stating that it had sentimental value. In 2001, Musk became involved with the nonprofit Mars Society and discussed funding plans to place a growth-chamber for plants on Mars. Seeking a way to launch the greenhouse payloads into space, Musk made two unsuccessful trips to Moscow to purchase intercontinental ballistic missiles (ICBMs) from Russian companies NPO Lavochkin and Kosmotras. Musk instead decided to start a company to build affordable rockets. With $100 million of his early fortune, (equivalent to $180,000,000 in 2025) Musk founded SpaceX in May 2002 and became the company's CEO and Chief Engineer. SpaceX attempted its first launch of the Falcon 1 rocket in 2006. Although the rocket failed to reach Earth orbit, it was awarded a Commercial Orbital Transportation Services program contract from NASA, then led by Mike Griffin. After two more failed attempts that nearly caused Musk to go bankrupt, SpaceX succeeded in launching the Falcon 1 into orbit in 2008. Later that year, SpaceX received a $1.6 billion NASA contract (equivalent to $2,400,000,000 in 2025) for Falcon 9-launched Dragon spacecraft flights to the International Space Station (ISS), replacing the Space Shuttle after its 2011 retirement. In 2012, the Dragon vehicle docked with the ISS, a first for a commercial spacecraft. Working towards its goal of reusable rockets, in 2015 SpaceX successfully landed the first stage of a Falcon 9 on a land platform. Later landings were achieved on autonomous spaceport drone ships, an ocean-based recovery platform. In 2018, SpaceX launched the Falcon Heavy; the inaugural mission carried Musk's personal Tesla Roadster as a dummy payload. Since 2019, SpaceX has been developing Starship, a reusable, super heavy-lift launch vehicle intended to replace the Falcon 9 and Falcon Heavy. In 2020, SpaceX launched its first crewed flight, the Demo-2, becoming the first private company to place astronauts into orbit and dock a crewed spacecraft with the ISS. In 2024, NASA awarded SpaceX an $843 million (equivalent to $865,000,000 in 2025) contract to build a spacecraft that NASA will use to deorbit the ISS at the end of its lifespan. In 2015, SpaceX began development of the Starlink constellation of low Earth orbit satellites to provide satellite Internet access. After the launch of prototype satellites in 2018, the first large constellation was deployed in May 2019. As of May 2025[update], over 7,600 Starlink satellites are operational, comprising 65% of all operational Earth satellites. The total cost of the decade-long project to design, build, and deploy the constellation was estimated by SpaceX in 2020 to be $10 billion (equivalent to $12,000,000,000 in 2025).[c] During the Russian invasion of Ukraine, Musk provided free Starlink service to Ukraine, permitting Internet access and communication at a yearly cost to SpaceX of $400 million (equivalent to $440,000,000 in 2025). However, Musk refused to block Russian state media on Starlink. In 2023, Musk denied Ukraine's request to activate Starlink over Crimea to aid an attack against the Russian navy, citing fears of a nuclear response. Tesla, Inc., originally Tesla Motors, was incorporated in July 2003 by Martin Eberhard and Marc Tarpenning. Both men played active roles in the company's early development prior to Musk's involvement. Musk led the Series A round of investment in February 2004; he invested $6.35 million (equivalent to $11,000,000 in 2025), became the majority shareholder, and joined Tesla's board of directors as chairman. Musk took an active role within the company and oversaw Roadster product design, but was not deeply involved in day-to-day business operations. Following a series of escalating conflicts in 2007 and the 2008 financial crisis, Eberhard was ousted from the firm.[page needed] Musk assumed leadership of the company as CEO and product architect in 2008. A 2009 lawsuit settlement with Eberhard designated Musk as a Tesla co-founder, along with Tarpenning and two others. Tesla began delivery of the Roadster, an electric sports car, in 2008. With sales of about 2,500 vehicles, it was the first mass production all-electric car to use lithium-ion battery cells. Under Musk, Tesla has since launched several well-selling electric vehicles, including the four-door sedan Model S (2012), the crossover Model X (2015), the mass-market sedan Model 3 (2017), the crossover Model Y (2020), and the pickup truck Cybertruck (2023). In May 2020, Musk resigned as chairman of the board as part of the settlement of a lawsuit from the SEC over him tweeting that funding had been "secured" for potentially taking Tesla private. The company has also constructed multiple lithium-ion battery and electric vehicle factories, called Gigafactories. Since its initial public offering in 2010, Tesla stock has risen significantly; it became the most valuable carmaker in summer 2020, and it entered the S&P 500 later that year. In October 2021, it reached a market capitalization of $1 trillion (equivalent to $1,200,000,000,000 in 2025), the sixth company in U.S. history to do so. Musk provided the initial concept and financial capital for SolarCity, which his cousins Lyndon and Peter Rive founded in 2006. By 2013, SolarCity was the second largest provider of solar power systems in the United States. In 2014, Musk promoted the idea of SolarCity building an advanced production facility in Buffalo, New York, triple the size of the largest solar plant in the United States. Construction of the factory started in 2014 and was completed in 2017. It operated as a joint venture with Panasonic until early 2020. Tesla acquired SolarCity for $2 billion in 2016 (equivalent to $2,700,000,000 in 2025) and merged it with its battery unit to create Tesla Energy. The deal's announcement resulted in a more than 10% drop in Tesla's stock price; at the time, SolarCity was facing liquidity issues. Multiple shareholder groups filed a lawsuit against Musk and Tesla's directors, stating that the purchase of SolarCity was done solely to benefit Musk and came at the expense of Tesla and its shareholders. Tesla directors settled the lawsuit in January 2020, leaving Musk the sole remaining defendant. Two years later, the court ruled in Musk's favor. In 2016, Musk co-founded Neuralink, a neurotechnology startup, with an investment of $100 million. Neuralink aims to integrate the human brain with artificial intelligence (AI) by creating devices that are embedded in the brain. Such technology could enhance memory or allow the devices to communicate with software. The company also hopes to develop devices to treat neurological conditions like spinal cord injuries. In 2022, Neuralink announced that clinical trials would begin by the end of the year. In September 2023, the Food and Drug Administration approved Neuralink to initiate six-year human trials. Neuralink has conducted animal testing on macaques at the University of California, Davis. In 2021, the company released a video in which a macaque played the video game Pong via a Neuralink implant. The company's animal trials—which have caused the deaths of some monkeys—have led to claims of animal cruelty. The Physicians Committee for Responsible Medicine has alleged that Neuralink violated the Animal Welfare Act. Employees have complained that pressure from Musk to accelerate development has led to botched experiments and unnecessary animal deaths. In 2022, a federal probe was launched into possible animal welfare violations by Neuralink.[needs update] In 2017, Musk founded the Boring Company to construct tunnels; he also revealed plans for specialized, underground, high-occupancy vehicles that could travel up to 150 miles per hour (240 km/h) and thus circumvent above-ground traffic in major cities. Early in 2017, the company began discussions with regulatory bodies and initiated construction of a 30-foot (9.1 m) wide, 50-foot (15 m) long, and 15-foot (4.6 m) deep "test trench" on the premises of SpaceX's offices, as that required no permits. The Los Angeles tunnel, less than two miles (3.2 km) in length, debuted to journalists in 2018. It used Tesla Model Xs and was reported to be a rough ride while traveling at suboptimal speeds. Two tunnel projects announced in 2018, in Chicago and West Los Angeles, have been canceled. A tunnel beneath the Las Vegas Convention Center was completed in early 2021. Local officials have approved further expansions of the tunnel system. April 14, 2022 In early 2017, Musk expressed interest in buying Twitter and had questioned the platform's commitment to freedom of speech. By 2022, Musk had reached 9.2% stake in the company, making him the largest shareholder.[d] Musk later agreed to a deal that would appoint him to Twitter's board of directors and prohibit him from acquiring more than 14.9% of the company. Days later, Musk made a $43 billion offer to buy Twitter. By the end of April Musk had successfully concluded his bid for approximately $44 billion. This included approximately $12.5 billion in loans and $21 billion in equity financing. Having backtracked on his initial decision, Musk bought the company on October 27, 2022. Immediately after the acquisition, Musk fired several top Twitter executives including CEO Parag Agrawal; Musk became the CEO instead. Under Elon Musk, Twitter instituted monthly subscriptions for a "blue check", and laid off a significant portion of the company's staff. Musk lessened content moderation and hate speech also increased on the platform after his takeover. In late 2022, Musk released internal documents relating to Twitter's moderation of Hunter Biden's laptop controversy in the lead-up to the 2020 presidential election. Musk also promised to step down as CEO after a Twitter poll, and five months later, Musk stepped down as CEO and transitioned his role to executive chairman and chief technology officer (CTO). Despite Musk stepping down as CEO, X continues to struggle with challenges such as viral misinformation, hate speech, and antisemitism controversies. Musk has been accused of trying to silence some of his critics such as Twitch streamer Asmongold, who criticized him during one of his streams. Musk has been accused of removing their accounts' blue checkmarks, which hinders visibility and is considered a form of shadow banning, or suspending their accounts without justification. Other activities In August 2013, Musk announced plans for a version of a vactrain, and assigned engineers from SpaceX and Tesla to design a transport system between Greater Los Angeles and the San Francisco Bay Area, at an estimated cost of $6 billion. Later that year, Musk unveiled the concept, dubbed the Hyperloop, intended to make travel cheaper than any other mode of transport for such long distances. In December 2015, Musk co-founded OpenAI, a not-for-profit artificial intelligence (AI) research company aiming to develop artificial general intelligence, intended to be safe and beneficial to humanity. Musk pledged $1 billion of funding to the company, and initially gave $50 million. In 2018, Musk left the OpenAI board. Since 2018, OpenAI has made significant advances in machine learning. In July 2023, Musk launched the artificial intelligence company xAI, which aims to develop a generative AI program that competes with existing offerings like OpenAI's ChatGPT. Musk obtained funding from investors in SpaceX and Tesla, and xAI hired engineers from Google and OpenAI. December 16, 2022 Musk uses a private jet owned by Falcon Landing LLC, a SpaceX-linked company, and acquired a second jet in August 2020. His heavy use of the jets and the consequent fossil fuel usage have received criticism. Musk's flight usage is tracked on social media through ElonJet. In December 2022, Musk banned the ElonJet account on Twitter, and made temporary bans on the accounts of journalists that posted stories regarding the incident, including Donie O'Sullivan, Keith Olbermann, and journalists from The New York Times, The Washington Post, CNN, and The Intercept. In October 2025, Musk's company xAI launched Grokipedia, an AI-generated online encyclopedia that he promoted as an alternative to Wikipedia. Articles on Grokipedia are generated and reviewed by xAI's Grok chatbot. Media coverage and academic analysis described Grokipedia as frequently reusing Wikipedia content but framing contested political and social topics in line with Musk's own views and right-wing narratives. A study by Cornell University researchers and NBC News stated that Grokipedia cites sources that are blacklisted or considered "generally unreliable" on Wikipedia, for example, the conspiracy site Infowars and the neo-Nazi forum Stormfront. Wired, The Guardian and Time criticized Grokipedia for factual errors and for presenting Musk himself in unusually positive terms while downplaying controversies. Politics Musk is an outlier among business leaders who typically avoid partisan political advocacy. Musk was a registered independent voter when he lived in California. Historically, he has donated to both Democrats and Republicans, many of whom serve in states in which he has a vested interest. Since 2022, his political contributions have mostly supported Republicans, with his first vote for a Republican going to Mayra Flores in the 2022 Texas's 34th congressional district special election. In 2024, he started supporting international far-right political parties, activists, and causes, and has shared misinformation and numerous conspiracy theories. Since 2024, his views have been generally described as right-wing. Musk supported Barack Obama in 2008 and 2012, Hillary Clinton in 2016, Joe Biden in 2020, and Donald Trump in 2024. In the 2020 Democratic Party presidential primaries, Musk endorsed candidate Andrew Yang and expressed support for Yang's proposed universal basic income, and endorsed Kanye West's 2020 presidential campaign. In 2021, Musk publicly expressed opposition to the Build Back Better Act, a $3.5 trillion legislative package endorsed by Joe Biden that ultimately failed to pass due to unanimous opposition from congressional Republicans and several Democrats. In 2022, gave over $50 million to Citizens for Sanity, a conservative political action committee. In 2023, he supported Republican Ron DeSantis for the 2024 U.S. presidential election, giving $10 million to his campaign, and hosted DeSantis's campaign announcement on a Twitter Spaces event. From June 2023 to January 2024, Musk hosted a bipartisan set of X Spaces with Republican and Democratic candidates, including Robert F. Kennedy Jr., Vivek Ramaswamy, and Dean Phillips. In October 2025, former vice-president Kamala Harris commented that it was a mistake from the Democratic side to not invite Musk to a White House electric vehicle event organized in August 2021 and featuring executives from General Motors, Ford and Stellantis, despite Tesla being "the major American manufacturer of extraordinary innovation in this space." Fortune remarked that this was a nod to United Auto Workers and organized labor. Harris said presidents should put aside political loyalties when it came to recognizing innovation, and guessed that the non-invitation impacted Musk's perspective. Fortune noted that, at the time, Musk said, "Yeah, seems odd that Tesla wasn't invited." A month later, he criticized Biden as "not the friendliest administration." Jacob Silverman, author of the book Gilded Rage: Elon Musk and the Radicalization of Silicon Valley, said that the tech industry represented by Musk, Thiel, Andreessen and other capitalists, actually flourished under Biden, but the tech leaders chose Trump for their common ground on cultural issues. By early 2024, Musk had become a vocal and financial supporter of Donald Trump. In July 2024, minutes after the attempted assassination of Donald Trump, Musk endorsed him for president saying; "I fully endorse President Trump and hope for his rapid recovery." During the presidential campaign, Musk joined Trump on stage at a campaign rally, and during the campaign promoted conspiracy theories and falsehoods about Democrats, election fraud and immigration, in support of Trump. Musk was the largest individual donor of the 2024 election. In 2025, Musk contributed $19 million to the Wisconsin Supreme Court race, hoping to influence the state's future redistricting efforts and its regulations governing car manufacturers and dealers. In 2023, Musk said he shunned the World Economic Forum because it was boring. The organization commented that they had not invited him since 2015. He has participated in Dialog, dubbed "Tech Bilderberg" and organized by Peter Thiel and Auren Hoffman, though. Musk's international political actions and comments have come under increasing scrutiny and criticism, especially from the governments and leaders of France, Germany, Norway, Spain and the United Kingdom, particularly due to his position in the U.S. government as well as ownership of X. An NBC News analysis found he had boosted far-right political movements to cut immigration and curtail regulation of business in at least 18 countries on six continents since 2023. During his speech after the second inauguration of Donald Trump, Musk twice made a gesture interpreted by many as a Nazi or a fascist Roman salute.[e] He thumped his right hand over his heart, fingers spread wide, and then extended his right arm out, emphatically, at an upward angle, palm down and fingers together. He then repeated the gesture to the crowd behind him. As he finished the gestures, he said to the crowd, "My heart goes out to you. It is thanks to you that the future of civilization is assured." It was widely condemned as an intentional Nazi salute in Germany, where making such gestures is illegal. The Anti-Defamation League said it was not a Nazi salute, but other Jewish organizations disagreed and condemned the salute. American public opinion was divided on partisan lines as to whether it was a fascist salute. Musk dismissed the accusations of Nazi sympathies, deriding them as "dirty tricks" and a "tired" attack. Neo-Nazi and white supremacist groups celebrated it as a Nazi salute. Multiple European political parties demanded that Musk be banned from entering their countries. The concept of DOGE emerged in a discussion between Musk and Donald Trump, and in August 2024, Trump committed to giving Musk an advisory role, with Musk accepting the offer. In November and December 2024, Musk suggested that the organization could help to cut the U.S. federal budget, consolidate the number of federal agencies, and eliminate the Consumer Financial Protection Bureau, and that its final stage would be "deleting itself". In January 2025, the organization was created by executive order, and Musk was designated a "special government employee". Musk led the organization and was a senior advisor to the president, although his official role is not clear. In sworn statement during a lawsuit, the director of the White House Office of Administration stated that Musk "is not an employee of the U.S. DOGE Service or U.S. DOGE Service Temporary Organization", "is not the U.S. DOGE Service administrator", and has "no actual or formal authority to make government decisions himself". Trump said two days later that he had put Musk in charge of DOGE. A federal judge has ruled that Musk acted as the de facto leader of DOGE. Musk's role in the second Trump administration, particularly in response to DOGE, has attracted public backlash. He was criticized for his treatment of federal government employees, including his influence over the mass layoffs of the federal workforce. He has prioritized secrecy within the organization and has accused others of violating privacy laws. A Senate report alleged that Musk could avoid up to $2 billion in legal liability as a result of DOGE's actions. In May 2025, Bill Gates accused Musk of "killing the world's poorest children" through his cuts to USAID, which modeling by Boston University estimated had resulted in 300,000 deaths by this time, most of them of children. By November 2025, the estimated death toll had increased to 400,000 children and 200,000 adults. Musk announced on May 28, 2025, that he would depart from the Trump administration as planned when the special government employee's 130 day deadline expired, with a White House official confirming that Musk's offboarding from the Trump administration was already underway. His departure was officially confirmed during a joint Oval Office press conference with Trump on May 30, 2025. @realDonaldTrump is in the Epstein files. That is the real reason they have not been made public. June 5, 2025 After leaving office, Musk criticized the Trump administration's Big Beautiful Bill, calling it a "disgusting abomination" due to its provisions increasing the deficit. A feud began between Musk and Trump, with its most notable event being Musk alleging Trump had ties to sex offender Jeffrey Epstein on X (formerly Twitter) on June 5, 2025. Trump responded on Truth Social stating that Musk went "CRAZY" after the "EV Mandate" was purportedly taken away and threatened to cut Musk's government contracts. Musk then called for a third Trump impeachment. The next day, Trump stated that he did not wish to reconcile with Musk, and added that Musk would face "very serious consequences" if he funds Democratic candidates. On June 11, Musk publicly apologized for the tweets against Trump, saying they "went too far". Views November 6, 2022 Rejecting the conservative label, Musk has described himself as a political moderate, even as his views have become more right-wing over time. His views have been characterized as libertarian and far-right, and after his involvement in European politics, they have received criticism from world leaders such as Emmanuel Macron and Olaf Scholz. Within the context of American politics, Musk supported Democratic candidates up until 2022, at which point he voted for a Republican for the first time. He has stated support for universal basic income, gun rights, freedom of speech, a tax on carbon emissions, and H-1B visas. Musk has expressed concern about issues such as artificial intelligence (AI) and climate change, and has been a critic of wealth tax, short-selling, and government subsidies. An immigrant himself, Musk has been accused of being anti-immigration, and regularly blames immigration policies for illegal immigration. He is also a pronatalist who believes population decline is the biggest threat to civilization, and identifies as a cultural Christian. Musk has long been an advocate for space colonization, especially the colonization of Mars. He has repeatedly pushed for humanity colonizing Mars, in order to become an interplanetary species and lower the risks of human extinction. Musk has promoted conspiracy theories and made controversial statements that have led to accusations of racism, sexism, antisemitism, transphobia, disseminating disinformation, and support of white pride. While describing himself as a "pro-Semite", his comments regarding George Soros and Jewish communities have been condemned by the Anti-Defamation League and the Biden White House. Musk was criticized during the COVID-19 pandemic for making unfounded epidemiological claims, defying COVID-19 lockdowns restrictions, and supporting the Canada convoy protest against vaccine mandates. He has amplified false claims of white genocide in South Africa. Musk has been critical of Israel's actions in the Gaza Strip during the Gaza war, praised China's economic and climate goals, suggested that Taiwan and China should resolve cross-strait relations, and was described as having a close relationship with the Chinese government. In Europe, Musk expressed support for Ukraine in 2022 during the Russian invasion, recommended referendums and peace deals on the annexed Russia-occupied territories, and supported the far-right Alternative for Germany political party in 2024. Regarding British politics, Musk blamed the 2024 UK riots on mass migration and open borders, criticized Prime Minister Keir Starmer for what he described as a "two-tier" policing system, and was subsequently attacked as being responsible for spreading misinformation and amplifying the far-right. He has also voiced his support for far-right activist Tommy Robinson and pledged electoral support for Reform UK. In February 2026, Musk described Spanish Prime Minister Pedro Sánchez as a "tyrant" following Sánchez's proposal to prohibit minors under the age of 16 from accessing social media platforms. Legal affairs In 2018, Musk was sued by the U.S. Securities and Exchange Commission (SEC) for a tweet stating that funding had been secured for potentially taking Tesla private.[f] The securities fraud lawsuit characterized the tweet as false, misleading, and damaging to investors, and sought to bar Musk from serving as CEO of publicly traded companies. Two days later, Musk settled with the SEC, without admitting or denying the SEC's allegations. As a result, Musk and Tesla were fined $20 million each, and Musk was forced to step down for three years as Tesla chairman but was able to remain as CEO. Shareholders filed a lawsuit over the tweet, and in February 2023, a jury found Musk and Tesla not liable. Musk has stated in interviews that he does not regret posting the tweet that triggered the SEC investigation. In 2019, Musk stated in a tweet that Tesla would build half a million cars that year. The SEC reacted by asking a court to hold him in contempt for violating the terms of the 2018 settlement agreement. A joint agreement between Musk and the SEC eventually clarified the previous agreement details, including a list of topics about which Musk needed preclearance. In 2020, a judge blocked a lawsuit that claimed a tweet by Musk regarding Tesla stock price ("too high imo") violated the agreement. Freedom of Information Act (FOIA)-released records showed that the SEC concluded Musk had subsequently violated the agreement twice by tweeting regarding "Tesla's solar roof production volumes and its stock price". In October 2023, the SEC sued Musk over his refusal to testify a third time in an investigation into whether he violated federal law by purchasing Twitter stock in 2022. In February 2024, Judge Laurel Beeler ruled that Musk must testify again. In January 2025, the SEC filed a lawsuit against Musk for securities violations related to his purchase of Twitter. In January 2024, Delaware judge Kathaleen McCormick ruled in a 2018 lawsuit that Musk's $55 billion pay package from Tesla be rescinded. McCormick called the compensation granted by the company's board "an unfathomable sum" that was unfair to shareholders. The Delaware Supreme Court overturned McCormick's decision in December 2025, restoring Musk's compensation package and awarding $1 in nominal damages. Personal life Musk became a U.S. citizen in 2002. From the early 2000s until late 2020, Musk resided in California, where both Tesla and SpaceX were founded. He then relocated to Cameron County, Texas, saying that California had become "complacent" about its economic success. While hosting Saturday Night Live in 2021, Musk stated that he has Asperger syndrome (an outdated term for autism spectrum disorder). When asked about his experience growing up with Asperger's syndrome in a TED2022 conference in Vancouver, Musk stated that "the social cues were not intuitive ... I would just tend to take things very literally ... but then that turned out to be wrong — [people were not] simply saying exactly what they mean, there's all sorts of other things that are meant, and [it] took me a while to figure that out." Musk suffers from back pain and has undergone several spine-related surgeries, including a disc replacement. In 2000, he contracted a severe case of malaria while on vacation in South Africa. Musk has stated he uses doctor-prescribed ketamine for occasional depression and that he doses "a small amount once every other week or something like that"; since January 2024, some media outlets have reported that he takes ketamine, marijuana, LSD, ecstasy, mushrooms, cocaine and other drugs. Musk at first refused to comment on his alleged drug use, before responding that he had not tested positive for drugs, and that if drugs somehow improved his productivity, "I would definitely take them!". The New York Times' investigations revealed Musk's overuse of ketamine and numerous other drugs, as well as strained family relationships and concerns from close associates who have become troubled by his public behavior as he became more involved in political activities and government work. According to The Washington Post, President Trump described Musk as "a big-time drug addict". Through his own label Emo G Records, Musk released a rap track, "RIP Harambe", on SoundCloud in March 2019. The following year, he released an EDM track, "Don't Doubt Ur Vibe", featuring his own lyrics and vocals. Musk plays video games, which he stated has a "'restoring effect' that helps his 'mental calibration'". Some games he plays include Quake, Diablo IV, Elden Ring, and Polytopia. Musk once claimed to be one of the world's top video game players but has since admitted to "account boosting", or cheating by hiring outside services to achieve top player rankings. Musk has justified the boosting by claiming that all top accounts do it so he has to as well to remain competitive. In 2024 and 2025, Musk criticized the video game Assassin's Creed Shadows and its creator Ubisoft for "woke" content. Musk posted to X that "DEI kills art" and specified the inclusion of the historical figure Yasuke in the Assassin's Creed game as offensive; he also called the game "terrible". Ubisoft responded by saying that Musk's comments were "just feeding hatred" and that they were focused on producing a game not pushing politics. Musk has fathered at least 14 children, one of whom died as an infant. The Wall Street Journal reported in 2025 that sources close to Musk suggest that the "true number of Musk's children is much higher than publicly known". He had six children with his first wife, Canadian author Justine Wilson, whom he met while attending Queen's University in Ontario, Canada; they married in 2000. In 2002, their first child Nevada Musk died of sudden infant death syndrome at the age of 10 weeks. After his death, the couple used in vitro fertilization (IVF) to continue their family; they had twins in 2004, followed by triplets in 2006. The couple divorced in 2008 and have shared custody of their children. The elder twin he had with Wilson came out as a trans woman and, in 2022, officially changed her name to Vivian Jenna Wilson, adopting her mother's surname because she no longer wished to be associated with Musk. Musk began dating English actress Talulah Riley in 2008. They married two years later at Dornoch Cathedral in Scotland. In 2012, the couple divorced, then remarried the following year. After briefly filing for divorce in 2014, Musk finalized a second divorce from Riley in 2016. Musk then dated the American actress Amber Heard for several months in 2017; he had reportedly been "pursuing" her since 2012. In 2018, Musk and Canadian musician Grimes confirmed they were dating. Grimes and Musk have three children, born in 2020, 2021, and 2022.[g] Musk and Grimes originally gave their eldest child the name "X Æ A-12", which would have violated California regulations as it contained characters that are not in the modern English alphabet; the names registered on the birth certificate are "X" as a first name, "Æ A-Xii" as a middle name, and "Musk" as a last name. They received criticism for choosing a name perceived to be impractical and difficult to pronounce; Musk has said the intended pronunciation is "X Ash A Twelve". Their second child was born via surrogacy. Despite the pregnancy, Musk confirmed reports that the couple were "semi-separated" in September 2021; in an interview with Time in December 2021, he said he was single. In October 2023, Grimes sued Musk over parental rights and custody of X Æ A-Xii. Elon Musk has taken X Æ A-Xii to multiple official events in Washington, D.C. during Trump's second term in office. Also in July 2022, The Wall Street Journal reported that Musk allegedly had an affair with Nicole Shanahan, the wife of Google co-founder Sergey Brin, in 2021, leading to their divorce the following year. Musk denied the report. Musk also had a relationship with Australian actress Natasha Bassett, who has been described as "an occasional girlfriend". In October 2024, The New York Times reported Musk bought a Texas compound for his children and their mothers, though Musk denied having done so. Musk also has four children with Shivon Zilis, director of operations and special projects at Neuralink: twins born via IVF in 2021, a child born in 2024 via surrogacy and a child born in 2025.[h] On February 14, 2025, Ashley St. Clair, an influencer and author, posted on X claiming to have given birth to Musk's son Romulus five months earlier, which media outlets reported as Musk's supposed thirteenth child.[i] On February 22, 2025, it was reported that St Clair had filed for sole custody of her five-month-old son and for Musk to be recognised as the child's father. On March 31, 2025, Musk wrote that, while he was unsure if he was the father of St. Clair's child, he had paid St. Clair $2.5 million and would continue paying her $500,000 per year.[j] Later reporting from the Wall Street Journal indicated that $1 million of these payments to St. Clair were structured as a loan. In 2014, Musk and Ghislaine Maxwell appeared together in a photograph taken at an Academy Awards after-party, which Musk later described as a "photobomb". The January 2026 Epstein files contain emails between Musk and Epstein from 2012 to 2013, after Epstein's first conviction. Emails released on January 30, 2026, indicated that Epstein invited Musk to visit his private island on multiple occasions. The correspondence showed that while Epstein repeatedly encouraged Musk to attend, Musk did not visit the island. In one instance, Musk discussed the possibility of attending a party with his then-wife Talulah Riley and asked which day would be the "wildest party"; according to the emails, the visit did not take place after Epstein later cancelled the plans.[k] On Christmas day in 2012, Musk emailed Epstein asking "Do you have any parties planned? I’ve been working to the edge of sanity this year and so, once my kids head home after Christmas, I really want to hit the party scene in St Barts or elsewhere and let loose. The invitation is much appreciated, but a peaceful island experience is the opposite of what I’m looking for". Epstein replied that the "ratio on my island" might make Musk's wife uncomfortable to which Musk responded, "Ratio is not a problem for Talulah". On September 11, 2013, Epstein sent an email asking Musk if he had any plans for coming to New York for the opening of the United Nations General Assembly where many "interesting people" would be coming to his house to which Musk responded that "Flying to NY to see UN diplomats do nothing would be an unwise use of time". Epstein responded by stating "Do you think i am retarded. Just kidding, there is no one over 25 and all very cute." Musk has denied any close relationship with Epstein and described him as a "creep" who attempted to ingratiate himself with influential people. When Musk was asked in 2019 if he introduced Epstein to Mark Zuckerberg, Musk responded: "I don’t recall introducing Epstein to anyone, as I don’t know the guy well enough to do so." The released emails nonetheless showed cordial exchanges on a range of topics, including Musk's inquiry about parties on the island. The correspondence also indicated that Musk suggested hosting Epstein at SpaceX, while Epstein separately discussed plans to tour SpaceX and bring "the girls", though there is no evidence that such a visit occurred. Musk has described the release of the files a "distraction", later accusing the second Trump administration of suppressing them to protect powerful individuals, including Trump himself.[l] Wealth Elon Musk is the wealthiest person in the world, with an estimated net worth of US$690 billion as of January 2026, according to the Bloomberg Billionaires Index, and $852 billion according to Forbes, primarily from his ownership stakes in SpaceX and Tesla. Having been first listed on the Forbes Billionaires List in 2012, around 75% of Musk's wealth was derived from Tesla stock in November 2020, although he describes himself as "cash poor". According to Forbes, he became the first person in the world to achieve a net worth of $300 billion in 2021; $400 billion in December 2024; $500 billion in October 2025; $600 billion in mid-December 2025; $700 billion later that month; and $800 billion in February 2026. In November 2025, a Tesla pay package worth potentially $1 trillion for Musk was approved, which he is to receive over 10 years if he meets specific goals. Public image Although his ventures have been highly influential within their separate industries starting in the 2000s, Musk only became a public figure in the early 2010s. He has been described as an eccentric who makes spontaneous and impactful decisions, while also often making controversial statements, contrary to other billionaires who prefer reclusiveness to protect their businesses. Musk's actions and his expressed views have made him a polarizing figure. Biographer Ashlee Vance described people's opinions of Musk as polarized due to his "part philosopher, part troll" persona on Twitter. He has drawn denouncement for using his platform to mock the self-selection of personal pronouns, while also receiving praise for bringing international attention to matters like British survivors of grooming gangs. Musk has been described as an American oligarch due to his extensive influence over public discourse, social media, industry, politics, and government policy. After Trump's re-election, Musk's influence and actions during the transition period and the second presidency of Donald Trump led some to call him "President Musk", the "actual president-elect", "shadow president" or "co-president". Awards for his contributions to the development of the Falcon rockets include the American Institute of Aeronautics and Astronautics George Low Transportation Award in 2008, the Fédération Aéronautique Internationale Gold Space Medal in 2010, and the Royal Aeronautical Society Gold Medal in 2012. In 2015, he received an honorary doctorate in engineering and technology from Yale University and an Institute of Electrical and Electronics Engineers Honorary Membership. Musk was elected a Fellow of the Royal Society (FRS) in 2018.[m] In 2022, Musk was elected to the National Academy of Engineering. Time has listed Musk as one of the most influential people in the world in 2010, 2013, 2018, and 2021. Musk was selected as Time's "Person of the Year" for 2021. Then Time editor-in-chief Edward Felsenthal wrote that, "Person of the Year is a marker of influence, and few individuals have had more influence than Musk on life on Earth, and potentially life off Earth too." Notes References Works cited Further reading External links |
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[SOURCE: https://forum.unity.com/c/getting-started/48] | [TOKENS: 54] |
Getting Started Welcome to Unity Discussions, the place for you to ask questions, discuss, help others, and get help from peers regarding Unity development. Unity Discussions Categories On this community forum, you will find a multitu… Powered by Discourse, best viewed with JavaScript enabled |
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[SOURCE: https://forum.unity.com/c/learn/50] | [TOKENS: 104] |
Learn Content Ongoing Technical Issues & Updates :megaphone: We are prioritizing the following issues based on their impact on your learning journey. Our engineering teams are working on resolutions, and we will update these statuses … Hi, everyone!!! :wave:t3: As we’re cleaning up this topic area, you might have noticed that some pinned posts have disappeared from the top of the topic listing. Were you looking for a tutorial that you kept top-of-mind… Powered by Discourse, best viewed with JavaScript enabled |
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[SOURCE: https://www.mako.co.il/men] | [TOKENS: 593] |
פלילים+ "כאן מס הכנסה, יש חוק חדש": עוקץ המיליוניםמאות קשישים וקשישות נפגעו "רכב מרוסק לחלוטין": 3 נהרגו בתאונה בגליל"ראינו גבר נוסף שוכב בתוך תעלה" פרטים חדשים בפרשת השוטר שניסה לרצוח עם ילדיו"יש ראיות להעמיד לדין את כל השלושה" מאות קשישים וקשישות נפגעו "ראינו גבר נוסף שוכב בתוך תעלה" "יש ראיות להעמיד לדין את כל השלושה" חשד שמכר סמים לשוטר סמוי "חטף לה את השרשרת, הפיל אותה לרצפה וברח" הילד מרחובות הפך לעבריין שאי אפשר לפצח הבקשה החריגה של בני הזוג מהחוקר הפרטי האישה הבוגדת לא ויתרה תוצאות החקירה לא הפתיעו את הבעל "הרגשנו כמו ברווזים במטווח" "הם מתפרנסים מעולם הפשע" תושבי הנגב חוששים לחייהם אחרי אירועי הסופ"ש |
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[SOURCE: https://en.wikipedia.org/wiki/%27Akbara] | [TOKENS: 1946] |
Contents 'Akbara 'Akbara (Arabic: عكبرة) is an Arab village in the Israeli municipality of Safed, which included in 2010 more than 200 families. It is 2.5 km south of Safed City. The village was rebuilt in 1977, close to the old village destroyed in 1948 during the 1947–1949 Palestine war. Location The village of 'Akbara was situated 2.5 km south of Safad, along the two sides of a deep wadi that ran north–south. Southeast of the village lay Khirbet al-'Uqeiba, identified as the Roman village Achabare, or Acchabaron. This khirba was a populated village as late as 1904. History The first mention of 'Akbara is during the Second Temple period by Josephus Flavius who noted the rock of Acchabaron (Ακχαβαρων πετραν) among the places in the Upper Galilee he fortified as a preparation for the First Jewish Revolt, while leading rebel forces against the Romans in Galilee. This site is identified with caves situated along the cliffs south of 'Akbara. The nearby Khirbet al-'Uqeiba was first excavated during the Mandate period, and was shown to contain remains such as building foundations, hewn stones, and wine presses. Cisterns, tombs, oil press and the walls of ancient synagogues have also been found. Foerster identifies the ruins as the "early Galilean type" synagogue. According to Liebner, a 1965 letter in the IAA composed by antiquities inspector N. Tfilinski notes a Hebrew inscription on a building stone found at the site. The current location of the stone is unknown. Above the settlement, a 135 m high vertical cliff is located. There are one hundred and twenty-nine natural and man-made caves interconnected by passages in the cliff. According to tradition, those caves were used for shelter by Jews during their war with Romans. During archeological excavations, coins from Dor and Sepphoris were found in the caves, dating to the Roman emperor Trajan period. Akbara/Akbari/Akbora/Akborin is mentioned several times in Rabbinic literature as early as second half of the third century CE. According to some traditions Rabbi Yannai disciples lived in 'Akbara forming an agricultural community; R. Yannai established a bet midrash there. The earliest mention of this bet midrash is in the context of discussions between Rabbi Yohanan and sages of 'Akbara. The Talmud school of Rabbi Jose bar Abin was also in Akbara. Several of the rabbis mentioned in the tractate Pirkei Avot lived in 'Akbara. Akbara is mentioned as the burial place of several Talmudic sages: Rabbi Nehurai, Rabbi Yannai, and Rabbi Dostai, his son, buried "in the gardens" "by the spring". According to tradition, the body of Rabbi Elazar ben Simeon was laying for twenty two years in his widow's garret in Akbara since he told her not to allow his colleagues to bury him. Rabbi Elazar ben Simeon feared to be dishonoured due to his aid to the Romans. The local Jewish community is attested during the Fatimid rule from 969 to 1099 by the Cairo Geniza. Samuel ben Samson visited 'Akbara during his 1210 Palestine pilgrimage and he described the tomb of Rabbi Meir he had found there. In 1258 Jacob of Paris visited Akbara and found there, according to Pirkei Avot, the tomb of Rabbi Nehurai. 'Akbara was incorporated into the Ottoman Empire in 1517. Moshe Basola visited the village in 1522 and said that he had found there a "destroyed synagogue, 3 cubits high remaining on two sides". Later in 1968 the remains of the synagogue were identified by Foester. In the census of 1596, the village was part of the nahiya ("subdistrict") of Jira, which was a part of Liwa Safad, with a population of 36 households and 1 bachelor, all Muslims. It paid taxes on a number of crops and produce, including wheat, barley, summer crops, olives, occasional revenues, goats, beehives, and a press which was either used for processing grapes or olives; a total of 6,115 akçe. 6/24 of the revenue went to a waqf. In 1648, Turkish traveler Evliya Tshelebi visited Galilee and reflected on the history of Akbara cliff caves: "The children of Israel escaped the plague and hid in these caves. Then Allah sent them a bad spirit which caused them to perish within the caves. Their skeletons, heaped together, can be seen there to this day." In 1838, it was noted as a village in the Safad district, while in 1875 the archeologist Victor Guérin visited, and described it thus: "The ruins of Akbara cover a hillock whose slopes were formerly sustained by walls forming terraces; the threshing floors of an Arab village occupy the summit. Round these are grouped the remains of ancient constructions now overthrown." "The village lies on the east of the wady. It is dominated by a platform on which foundations can be traced of a rectangular enclosure called el Kuneiseh, measuring thirty paces in length by twenty-three in breadth. It stands east and west, and was firmly constructed of good cut stones. The interior is at present given up to cultivation. This enclosure seems to have been once a Christian church." In 1881, the PEF's Survey of Western Palestine (SWP) described Akbara as a village of stone and adobe with about 90 inhabitants who cultivated olive and fig trees. A population list from about 1887 showed Akbara to have about 335 inhabitants, all Muslims. In the 1922 census of Palestine conducted by the British Mandate authorities, Akbara had a population of 147; all Muslims, increasing in the 1931 census to 275, still all Muslims, in a total of 49 houses. During this period the village houses were made of masonry. In the 1945 statistics the population was 390 Muslims, and the total land area was 3,224 dunums; 2,222 dunums was used for cereals, 199 dunums were irrigated or used for orchards, and 6 dunams were built-up (urban) land. During the siege of Safad 'Akbara was targeted for occupation in line with Plan Dalet. The Hagana attack was launched on 9 May and completed by the Palmach's first battalion. It was found that many of the villagers had fled due to news of Deir Yassin and 'Ein al Zeitun, the village was then blown up and destroyed. On 25 May 1948, during Operation Yiftah, under the command of Yigal Allon, Galilee was cleared of its Palestinian Arab population. Following the 25 May exodus of al-Khisas, the last 55 villagers who had remained in their homes for just over a year were "transferred" by Israeli forces despite having friendly relations and collaboration with Jewish settlements in the area. During the night of 5/6 June 1949, the village of al-Khisas was surrounded by trucks and the villagers were forced into the trucks "with kicks, curses and maltreatment," in the words of a Mapam Knesset member, Elizer Peri, quoted by Morris: "The remaining villagers said that they had been 'forced with their hands to destroy their dwellings,' and had been treated like 'cattle.' They were then dumped on a bare, sun-scorched hillside near the village of 'Akbara where they were left 'wandering in the wilderness, thirsty and hungry.' They lived there under inhuman conditions for years afterwards," along with the inhabitants of at least two other villages (Qaddita and al-Ja'una) expelled in similar circumstances. The expellees remained at ’Akbara for eighteen years until agreeing to resettlement in Wadi Hamam. Salman Abu-Sitta, author of the Atlas of Palestine, estimated that the number of Palestinian refugees from 'Akbara in 1998 was 1,852 people. Of what remains of 'Akbara's built structures, Walid Khalidi wrote in 1992 that "the original inhabitants of the village were replaced by 'internal' refugees from Qaddita villages several kilometers north of Safd. Since 1980, however, these internal refugees have been gradually relocated to the nearby, planned village of 'Akbara, 0.5 km west of the old village site. As a precondition of the relocation, each family was required to demolish its home in the former village. Today, fifteen of the old houses still stand on the site, in addition to the school. The new village of 'Akbara was placed under the administration of the city of Safad in 1977. It is now a neighbourhood of the city of Safed.[clarification needed] See also References Bibliography External links |
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