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= The Amps =
The Amps were an American alternative @-@ indie rock group . Formed by Kim Deal in 1995 after her band the Breeders went on hiatus , the group consisted of Deal , vocals and guitars ; Luis Lerma , bass ; Nate Farley , guitars ; and the Breeders ' Jim Macpherson , drums . The Breeders ' Kelley Deal , Kim 's sister , was also briefly involved , but had to leave the band due to drug problems . The group was named when Kim Deal started calling herself Tammy Ampersand for fun , and the band Tammy and the Amps . They recorded the album Pacer in Ireland and the United States .
Pacer was released in October 1995 . The group toured the United States , Europe , and Australia , with bands including the Foo Fighters , Sonic Youth , and Guided by Voices . Critics commented on the loose and rough quality of these performances . The Amps continued as a group until 1996 , when Deal changed their name back to the Breeders . By 2000 , Macpherson , Lerma , and Farley had left the band ; they were all at times involved in various projects with Guided by Voices ' Robert Pollard . Deal 's next album , the Breeders ' Title TK , was released seven years after Pacer .
= = Background and formation = =
From 1986 to 1992 , Deal was a member of the Pixies , and from 1989 onwards , the Breeders . In August 1993 , the Breeders released their second album , Last Splash , which went platinum in the USA , gold in Canada , and silver in the UK . The other members of the group at that time were Kim 's twin sister Kelley Deal , Josephine Wiggs and Jim Macpherson . By late 1994 , after two years of straight touring and recording , and culminating in the Lollapalooza tour , the band members were exhausted ; they decided to take some time off from the Breeders , but this hiatus ended up being longer than expected . Kelley was arrested on drug charges in late 1994 and spent time in and out of rehabilitation , while Wiggs became involved in musical projects in New York , including collaborations with members of Luscious Jackson .
Meanwhile , Kim Deal was eager to continue recording and performing . At first , she envisioned her next album as a solo record , on which she would play all of the instrument parts . When she was recording initial demos for the project , she asked Kelley to play on some of them , to distract her from her drug difficulties . Since Kelley was now also involved , Deal decided not to go solo , but formed a new group . She recruited Macpherson to play drums , musician Luis Lerma , bass , and Nate Farley , guitar . Later , Kelley dropped out of the project for rehabilitation and moved to Saint Paul , Minnesota . For fun , Deal began calling herself Tammy Ampersand , and the group , Tammy and the Amps . This later became simply the Amps .
= = Recording and touring = =
The Amps released one album , Pacer , which was recorded at several different studios . The first session , at Easley Studios in Memphis , Tennessee , was engineered by Davis McCain and Doug Easley . There Deal recorded new songs , including what would become Pacer 's single , " Tipp City " . This recording opportunity came about when she was producing a planned record by Guided by Voices ; when that group abandoned work on their album , Deal used the leftover studio time for her own songs . Following the Easley Studios session , recording for Pacer continued at six other locations in total , including studios in Chicago , Los Angeles , Dublin , and Deal 's hometown , Dayton , Ohio . Engineers Steve Albini , John Agnello , Bryce Goggin and others each helped record one or more of these sessions . Pacer came out in October 1995 .
The Amps toured throughout 1995 and 1996 . Early performances , before releasing Pacer , included June 1995 shows in Dayton : one with Poster Children and another with Guided by Voices . They toured with Guided by Voices and Chavez in the United Kingdom in September , in cities such as London , Glasgow , and Sheffield , and played another show with Guided by Voices in Ohio in October . The Amps performed a series of US concerts in October and November with Sonic Youth , including shows in Detroit and Chicago with Helium , in Seattle and Portland with Bikini Kill , and in Los Angeles with Mike Watt . Following the concerts with Sonic Youth , the Amps did a tour of Europe . In January 1996 , they played the Summersault festival in Australia . That year , the Amps toured with the Foo Fighters in the United States , in locations such as Chicago ( with That Dog ) , Worcester , Massachusetts , and Austin , Texas ( with Jawbreaker ) . In 1995 or 1996 , they also played shows with the Tasties and Brainiac .
Reviewers described live concerts by the Amps as unpolished and relaxed . The Chronicle 's Drema Crist praised their show at an unidentified location as " fun @-@ spirited and silly " . Greg Kot of The Chicago Tribune described one of their Chicago performances as " off @-@ kilter " and wrote that " Deal 's pungent vocals were swallowed up by the guitars , and the foursome 's slight melodies were lost amid all the bashing . " A review in The Chicago Reader of the same concert noted that " The Amps play with a low @-@ key , hangout sound . " The Phoenix 's Matt Ashare felt that at their December 1995 show in Boston " the Amps didn 't click in a way that would suggest that this was Deal 's new , full @-@ time band " ; he added that it was " an unpretentiously gritty way for Deal to let off some steam while the Breeders [ took ] a little break " . In Boston Rock , this concert was characterized as " sloppy " but " charm [ ing ] ... hanging loosely off Kim 's gruff vocals and ebullient personality " .
= = Reforming the Breeders = =
Later in 1996 , Deal changed the name of the group back to the Breeders , originally with almost the same line @-@ up as the Amps . Until then , Deal had been waiting for Wiggs and Kelley to rejoin the Breeders and record a new album together , and had held back from reforming the Breeders out of respect for them . In May 1996 , Wiggs revealed that she would not be involved in any immediate Breeders activity ; Kelley also chose to stay in Saint Paul , to be close to her rehabilitation facility . Deal then decided that she did not want to wait any longer to reform the group , partly because the Breeders ' repertoire was larger than the Amps ' , thereby allowing longer concerts . Deal added violinist Carrie Bradley ( who had played on the Breeders ' Pod album ) , and with Macpherson , Lerma , and Farley , played some shows in 1996 with Primus .
By 1998 , Kelley had rejoined and Macpherson had left the group , and by 2000 Lerma and Farley had also left . The Breeders , with a line @-@ up including the Deal sisters and new members Mando Lopez and Jose Medeles , released the albums Title TK in 2002 and Mountain Battles in 2008 . Meanwhile , Macpherson was a member of Guided by Voices from 1998 to 2001 , and participated in other projects with Guided By Voices ' Robert Pollard until 2005 . Lerma and Farley have been members of the Tasties , and in 1999 participated in Pollard 's Lexo and the Leapers side project group ; Farley was also a member of Guided by Voices from 1999 to 2004 . In 2013 , the Last Splash @-@ era Breeders line @-@ up of Kim and Kelley Deal , Macpherson , and Wiggs reunited to tour to celebrate the 20th anniversary of that album .
= = Members = =
Kim Deal – vocals , guitars
Luis Lerma – bass
Nate Farley – guitars
Jim Macpherson – drums
= = Discography = =
= = = Album = = =
= = = Single = = =
= Exploration of Jupiter =
The exploration of Jupiter has been conducted via close observations by automated spacecraft . It began with the arrival of Pioneer 10 into the Jovian system in 1973 , and , as of 2016 , has continued with eight further spacecraft missions . All of these missions were undertaken by the National Aeronautics and Space Administration ( NASA ) , and all but two have been flybys that take detailed observations without the probe landing or entering orbit . These probes make Jupiter the most visited of the Solar System 's outer planets as all missions to the outer Solar System have used Jupiter flybys to reduce fuel requirements and travel time . On 5th July 2016 , spacecraft Juno arrived and entered the planet 's orbit — the second craft ever to do so . Sending a craft to Jupiter entails many technical difficulties , especially due to the probes ' large fuel requirements and the effects of the planet 's harsh radiation environment .
The first spacecraft to visit Jupiter was Pioneer 10 in 1973 , followed a year later by Pioneer 11 . Aside from taking the first close @-@ up pictures of the planet , the probes discovered its magnetosphere and its largely fluid interior . The Voyager 1 and Voyager 2 probes visited the planet in 1979 , and studied its moons and the ring system , discovering the volcanic activity of Io and the presence of water ice on the surface of Europa . Ulysses further studied Jupiter 's magnetosphere in 1992 and then again in 2000 . The Cassini probe approached the planet in 2000 and took very detailed images of its atmosphere . The New Horizons spacecraft passed by Jupiter in 2007 and made improved measurements of its and its satellites ' parameters .
The Galileo spacecraft was the first to have entered orbit around Jupiter , arriving in 1995 and studying the planet until 2003 . During this period Galileo gathered a large amount of information about the Jovian system , making close approaches to all of the four large Galilean moons and finding evidence for thin atmospheres on three of them , as well as the possibility of liquid water beneath their surfaces . It also discovered a magnetic field around Ganymede . As it approached Jupiter , it also witnessed the impact of Comet Shoemaker – Levy 9 . In December 1995 , it sent an atmospheric probe into the Jovian atmosphere , so far the only craft to do so .
In July 2016 , the Juno spacecraft , launched in 2011 , completed its orbital insertion maneuver successfully , and is now in orbit around Jupiter and preparing for its science programme .
The European Space Agency selected the L1 @-@ class JUICE mission in 2012 as part of its Cosmic Vision programme to explore three of Jupiter 's Galilean moons , with a possible Ganymede lander provided by Roscosmos . JUICE is proposed to be launched in 2022 .
= = Technical requirements = =
Flights from Earth to other planets in the Solar System have a high energy cost . It requires almost the same amount of energy for a spacecraft to reach Jupiter from Earth 's orbit as it does to lift it into orbit in the first place . In astrodynamics , this energy expenditure is defined by the net change in the spacecraft 's velocity , or delta @-@ v. The energy needed to reach Jupiter from an Earth orbit requires a delta @-@ v of about 9 km / s , compared to the 9 @.@ 0 – 9 @.@ 5 km / s to reach a low Earth orbit from the ground . Gravity assists through planetary flybys ( such as by Earth or Venus ) can be used to reduce the energetic requirement ( i.e. the fuel ) at launch , at the cost of a significantly longer flight duration to reach a target such as Jupiter when compared to the direct trajectory . Ion thrusters capable of a delta @-@ v of more than 10 kilometers / s were used on the Dawn spacecraft . This is more than enough delta @-@ v to do a Jupiter fly @-@ by mission from a solar orbit of the same radius as that of Earth without gravity assist .
A major problem in sending space probes to Jupiter is that the planet has no solid surface on which to land , as there is a smooth transition between the planet 's atmosphere and its fluid interior . Any probes descending into the atmosphere are eventually crushed by the immense pressures within Jupiter .
Another major issue is the amount of radiation to which a space probe is subjected , due to the harsh charged @-@ particle environment around Jupiter ( for a detailed explanation see Magnetosphere of Jupiter ) . For example , when Pioneer 11 made its closest approach to the planet , the level of radiation was ten times more powerful than Pioneer 's designers had predicted , leading to fears that the probes would not survive . With a few minor glitches , the probe managed to pass through the radiation belts , but it lost most of the images of the moon Io , as the radiation had caused Pioneer 's imaging photo polarimeter to receive false commands . The subsequent and far more technologically advanced Voyager spacecraft had to be redesigned to cope with the radiation levels . Over the eight years the Galileo spacecraft orbited the planet , the probe 's radiation dose far exceeded its design specifications , and its systems failed on several occasions . The spacecraft 's gyroscopes often exhibited increased errors , and electrical arcs sometimes occurred between its rotating and non @-@ rotating parts , causing it to enter safe mode , which led to total loss of the data from the 16th , 18th and 33rd orbits . The radiation also caused phase shifts in Galileo 's ultra @-@ stable quartz oscillator .
= = Flyby missions = =
= = = Pioneer program ( 1973 and 1974 ) = = =
The first spacecraft to explore Jupiter was Pioneer 10 , which flew past the planet in December 1973 , followed by Pioneer 11 twelve months later . Pioneer 10 obtained the first @-@ ever close @-@ up images of Jupiter and its Galilean moons ; the spacecraft studied the planet 's atmosphere , detected its magnetic field , observed its radiation belts and determined that Jupiter is mainly fluid . Pioneer 11 made its closest approach , within some 34 @,@ 000 km of Jupiter 's cloud tops , on December 4 , 1974 . It obtained dramatic images of the Great Red Spot , made the first observation of Jupiter 's immense polar regions , and determined the mass of Jupiter 's moon Callisto . The information gathered by these two spacecraft helped astronomers and engineers improve the design of future probes to cope more effectively with the environment around the giant planet .
= = = Voyager program ( 1979 ) = = =
Voyager 1 began photographing Jupiter in January 1979 and made its closest approach on March 5 , 1979 , at a distance of 349 @,@ 000 km from Jupiter 's center . This close approach allowed for greater image resolution , though the flyby 's short duration meant that most observations of Jupiter 's moons , rings , magnetic field , and radiation environment were made in the 48 @-@ hour period bracketing the approach , even though Voyager 1 continued photographing the planet until April . It was soon followed by Voyager 2 , which made its closest approach on July 9 , 1979 , 576 @,@ 000 km away from the planet 's cloud tops . The probe discovered Jupiter 's ring , observed intricate vortices in its atmosphere , observed active volcanoes on Io , a process analogous to plate tectonics on Ganymede , and numerous craters on Callisto .
The Voyager missions vastly improved our understanding of the Galilean moons , and also discovered Jupiter 's rings . They also took the first close @-@ up images of the planet 's atmosphere , revealing the Great Red Spot as a complex storm moving in a counter @-@ clockwise direction . Other smaller storms and eddies were found throughout the banded clouds ( see animation on the right ) . Two new , small satellites , Adrastea and Metis , were discovered orbiting just outside the ring , making them the first of Jupiter 's moons to be identified by a spacecraft . A third new satellite , Thebe , was discovered between the orbits of Amalthea and Io .
The discovery of volcanic activity on the moon Io was the greatest unexpected finding of the mission , as it was the first time an active volcano was observed on a celestial body other than Earth . Together , the Voyagers recorded the eruption of nine volcanoes on Io , as well as evidence for other eruptions occurring between the Voyager encounters .
Europa displayed a large number of intersecting linear features in the low @-@ resolution photos from Voyager 1 . At first , scientists believed the features might be deep cracks , caused by crustal rifting or tectonic processes . The high @-@ resolution photos from Voyager 2 , taken closer to Jupiter , left scientists puzzled as the features in these photos were almost entirely lacking in topographic relief . This led many to suggest that these cracks might be similar to ice floes on Earth , and that Europa might have a liquid water interior . Europa may be internally active due to tidal heating at a level about one @-@ tenth that of Io , and as a result , the moon is thought to have a thin crust less than 30 kilometers ( 19 mi ) thick of water ice , possibly floating on a 50 @-@ kilometers @-@ deep ( 30 mile ) ocean .
= = = Ulysses ( 1992 ) = = =
On February 8 , 1992 , the Ulysses solar probe flew past Jupiter 's north pole at a distance of 451 @,@ 000 km . This swing @-@ by maneuver was required for Ulysses to attain a very high @-@ inclination orbit around the Sun , increasing its inclination to the ecliptic to 80 @.@ 2 degrees . The giant planet 's gravity bent the spacecraft 's flightpath downward and away from the ecliptic plane , placing it into a final orbit around the Sun 's north and south poles . The size and shape of the probe 's orbit were adjusted to a much smaller degree , so that its aphelion remained at approximately 5 AU ( Jupiter 's distance from the Sun ) , while its perihelion lay somewhat beyond 1 AU ( Earth 's distance from the Sun ) . During its Jupiter encounter , the probe made measurements of the planet 's magnetosphere . Since the probe had no cameras , no images were taken . In February 2004 , the probe arrived again at the vicinity of Jupiter . This time the distance from the planet was much greater — about 240 million km — but it made further observations of Jupiter .
= = = Cassini ( 2000 ) = = =
In 2000 , the Cassini probe , en route to Saturn , flew by Jupiter and provided some of the highest @-@ resolution images ever taken of the planet . It made its closest approach on December 30 , 2000 , and made many scientific measurements . About 26 @,@ 000 images of Jupiter were taken during the months @-@ long flyby . It produced the most detailed global color portrait of Jupiter yet , in which the smallest visible features are approximately 60 km ( 37 mi ) across .
A major finding of the flyby , announced on March 6 , 2003 , was of Jupiter 's atmospheric circulation . Dark belts alternate with light zones in the atmosphere , and the zones , with their pale clouds , had previously been considered by scientists to be areas of upwelling air , partly because on Earth clouds tend to be formed by rising air . Analysis of Cassini imagery showed that the dark belts contain individual storm cells of upwelling bright @-@ white clouds , too small to see from Earth . Anthony Del Genio of NASA 's Goddard Institute for Space Studies said that " the belts must be the areas of net @-@ rising atmospheric motion on Jupiter , [ so ] the net motion in the zones has to be sinking " .
Other atmospheric observations included a swirling dark oval of high atmospheric @-@ haze , about the size of the Great Red Spot , near Jupiter 's north pole . Infrared imagery revealed aspects of circulation near the poles , with bands of globe @-@ encircling winds , and adjacent bands moving in opposite directions . The same announcement also discussed the nature of Jupiter 's rings . Light scattering by particles in the rings showed the particles were irregularly shaped ( rather than spherical ) and likely originated as ejecta from micrometeorite impacts on Jupiter 's moons , probably on Metis and Adrastea . On December 19 , 2000 , the Cassini spacecraft captured a very @-@ low @-@ resolution image of the moon Himalia , but it was too distant to show any surface details .
= = = New Horizons ( 2007 ) = = =
The New Horizons probe , en route to Pluto , flew by Jupiter for a gravity assist and was the first probe launched directly towards Jupiter since the Ulysses in 1990 . Its Long Range Reconnaissance Imager ( LORRI ) took its first photographs of Jupiter on September 4 , 2006 . The spacecraft began further study of the Jovian system in December 2006 , and made its closest approach on February 28 , 2007 .
Although close to Jupiter , New Horizons ' instruments made refined measurements of the orbits of Jupiter 's inner moons , particularly Amalthea . The probe 's cameras measured volcanoes on Io , studied all four Galilean moons in detail , and made long @-@ distance studies of the outer moons Himalia and Elara . The craft also studied Jupiter 's Little Red Spot and the planet 's magnetosphere and tenuous ring system .
On March 19 , 2007 the Command and Data Handling computer experienced an uncorrectable memory error and rebooted itself , causing the spacecraft to go into safe mode . The craft fully recovered within two days , with some data loss on Jupiter 's magnetotail . No other data loss events were associated with the encounter . Due to the immense size of the Jupiter system and the relative closeness of the Jovian system to Earth in comparison to the closeness of Pluto to Earth , New Horizons will send back more data to Earth from the Jupiter encounter than the Pluto encounter .
= = Orbiter missions = =
= = = Galileo ( 1995 – 2003 ) = = =
The first spacecraft to orbit Jupiter was the Galileo orbiter , which went into orbit around Jupiter on December 7 , 1995 . It orbited the planet for over seven years , making 35 orbits before it was destroyed during a controlled impact with Jupiter on September 21 , 2003 . During this period , it gathered a large amount of information about the Jovian system ; the amount of information was not as great as intended because the deployment of its high @-@ gain radio transmitting antenna failed . The major events during the eight @-@ year study included multiple flybys of all of the Galilean moons , as well as Amalthea ( the first probe to do so ) . It also witnessed the impact of Comet Shoemaker – Levy 9 as it approached Jupiter in 1994 and the sending of an atmospheric probe into the Jovian atmosphere in December 1995 .
Cameras on the Galileo spacecraft observed fragments of Comet Shoemaker – Levy 9 between 16 and 22 July 1994 as they collided with Jupiter 's southern hemisphere at a speed of approximately 60 kilometres per second . This was the first direct observation of an extraterrestrial collision of solar system objects . While the impacts took place on the side of Jupiter hidden from Earth , Galileo , then at a distance of 1 @.@ 6 AU from the planet , was able to see the impacts as they occurred . Its instruments detected a fireball that reached a peak temperature of about 24 @,@ 000 K , compared to the typical Jovian cloudtop temperature of about 130 K ( − 143 ° C ) , with the plume from the fireball reaching a height of over 3 @,@ 000 km .
An atmospheric probe was released from the spacecraft in July 1995 , entering the planet 's atmosphere on December 7 , 1995 . After a high @-@ g descent into the Jovian atmosphere , the probe discarded the remains of its heat shield , and it parachuted through 150 km of the atmosphere , collecting data for 57 @.@ 6 minutes , before being crushed by the pressure and temperature to which it was subjected ( about 22 times Earth normal , at a temperature of 153 ° C ) . It would have melted thereafter , and possibly vaporized . The Galileo orbiter itself experienced a more rapid version of the same fate when it was deliberately steered into the planet on September 21 , 2003 at a speed of over 50 km / s , in order to avoid any possibility of it crashing into and contaminating Europa .
Major scientific results of the Galileo mission include :
the first observation of ammonia clouds in another planet 's atmosphere — the atmosphere creates ammonia ice particles from material coming up from lower depths ;
confirmation of extensive volcanic activity on Io — which is 100 times greater than that found on Earth ; the heat and frequency of eruptions are reminiscent of early Earth ;
observation of complex plasma interactions in Io 's atmosphere which create immense electrical currents that couple to Jupiter 's atmosphere ;
providing evidence for supporting the theory that liquid oceans exist under Europa 's icy surface ;
first detection of a substantial magnetic field around a satellite ( Ganymede ) ;
magnetic data evidence suggesting that Europa , Ganymede and Callisto have a liquid @-@ saltwater layer under the visible surface ;
evidence for a thin atmospheric layer on Europa , Ganymede , and Callisto known as a ' surface @-@ bound exosphere ' ;
understanding of the formation of the rings of Jupiter ( by dust kicked up as interplanetary meteoroids which smash into the planet 's four small inner moons ) and observation of two outer rings and the possibility of a separate ring along Amalthea 's orbit ;
identification of the global structure and dynamics of a giant planet 's magnetosphere .