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right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and frankly , if that person , that person , if there is a civilization there right now and if they 're sitting right there , and they 're observing photons being emitted from our coordinate , from our point in space right now , they 're not going to see us . they 're going to see us 13.4 billion years ago . they 're g... | after another 13.7b years ( or more depending on expansion rate ) it will be possible to `` see '' again a photon that we can see `` now '' ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | there 's an optimistic way of viewing it . it is like , wow , i was able to cover 20 million light years in only 10 million years . it looks like i 'm moving faster than the speed of light . | will we be able to `` see '' after billions of years what is happening on earth now ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | if the universe is really expanding then the distance between the sun and earth also will be expanding ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | is the universe expanding at the speed of light ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and i want to make it very clear . this object is now 46 billion light years away from us . when we just use light to observe it , it looks like , just based on light years , hey , this light has been traveling 13.7 billion years to reach us . | because if this is so wo n't the light from any said galaxy or point never reach our eye as the said point is travelling further away from us at the same rate that the photon is travelling towards us sort of cancelling each other out ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | does that mean that each day ( since the universe is expanding in every direction ) we could observe further than `` the observable universe '' that we know today ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and frankly , if that person , that person , if there is a civilization there right now and if they 're sitting right there , and they 're observing photons being emitted from our coordinate , from our point in space right now , they 're not going to see us . they 're going to see us 13.4 billion years ago . they 're g... | if we could see an alien on the planet , would we see what it was doing 4 earth years ago or what it is doing now ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | it is like , wow , i was able to cover 20 million light years in only 10 million years . it looks like i 'm moving faster than the speed of light . the reality is it 's not because the space coordinates themselves are spreading out . | and if we launched tat telescope into space faster than the voyagers , would we be seeing the alien doing things faster ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and maybe this distance over here -- and i 'm just making up these numbers . in fact , that 's probably be too big for that point -- maybe this is now 100 million light years . this is now 100 million light years . | if the event in his explanation is 300000 years after the big bang started , then how could anything be 30mil ly unless at one point things were moving faster than light ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | they 're going to see us 13.4 billion years ago . they 're going to see the super primitive state of our region of space when it really was just a white-hot plasma . and we 're going to talk more about this in the next video . | at 19 , is the `` white hot plasma '' the same thing as the `` cosmic background radiation '' ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | if we can predict the radius of the observable universe , how do we predict the radius of the entire universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | i 'm kind of confused ... how do we know that the universe is n't expanding at a rate faster than the speed of light ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | it 's 20 million light years . so you ca n't just multiply a rate times time on these cosmological scales , especially when the coordinates themselves , the distance coordinates are actually moving away from each other . but i think you see , or maybe you might see , where this is going . | and if in the opposite case , ca n't we determine the rate of the expansion of universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | we 're going to see this white-hot plasma . the reality today is that point in space that 's 46 billion years from now , it 's probably differentiated into stable atoms , and stars , and planets , and galaxies . and frankly , if that person , that person , if there is a civilization there right now and if they 're sitt... | if the entire universe expands , and galaxies and stars get farther away from each other , do the stars and planets within the galaxies and star clusters also get farther away from each other ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and i also want to emphasize that this is the current best estimate . even in my lifetime , even in my lifetime that i actually knew about the big bang and that i would pay attention to what the best estimate was , this number 's been moving around . so i suspect that in the future , this number might become more accur... | would even the planets within our solar system expand from one another ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and we 'll see that that was the range that it was emitting in . but it emits a photon . and that photon is traveling at the speed of light . it is light . and so that photon , says , you know what , i only got 30 million light years to travel . that 's not too bad . | if gravity is pulling light , then should n't the photon that reached us got pulled by some kind of gravity ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | how big is the universe we live in ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | do all objects in the universe move away from each other at a constant rate ... .in a proportion ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | it seems like something that is tractable , but it really is n't . and in future videos , i 'm actually going to talk about the time scale . so we can really appreciate how long , or even start to appreciate , or appreciate that we ca n't appreciate how long 13.7 billion years is . | does that mean that the amount of matter in the universe now is always going to be the same amount of matter no matter what given time ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and we 'll see that that was the range that it was emitting in . but it emits a photon . and that photon is traveling at the speed of light . | why is the photon not effected by the expansion and move with it as the galaxies do ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | does gravity anchor you onto space so you expand with it being part of it , in a packet were you are not expanding due to the gravity , but without mass are you a separate from it ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and we 'll see that that was the range that it was emitting in . but it emits a photon . and that photon is traveling at the speed of light . | is a photon then at rest ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | even in my lifetime , even in my lifetime that i actually knew about the big bang and that i would pay attention to what the best estimate was , this number 's been moving around . so i suspect that in the future , this number might become more accurate or might move around some . but this is our best guess . | does the photon not move but space around it move ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so when we looked at that depiction -- this i think was two or three videos ago , of the observable universe -- i drew , it was this circle . and when we see light coming from these remote objects -- that light is getting to us right here . this is where we are . | why ca n't we see infinitely far if we have this light from insane distances , or even closer distances , reaching our eyes ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | the longest that that could have been traveling is 13.7 billion years . so it could be traveling 13.7 billion years . so when we looked at that depiction -- this i think was two or three videos ago , of the observable universe -- i drew , it was this circle . | was the big bang in 13.7 billion years , or 13.7 billion light years ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . | what is the 4th dimension ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | now , it is actually -- this is really just for the sake of giving you the idea of why -- well , giving you the intuition of what 's going on . this distance now is no longer 30 million light years . maybe it 's 100 million . | if the universe was only 300,000 thousand years old , how could something be at 30 million light-years distance ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | how old is the universe and if the universe is expanding would n't it take more and more longer ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | would the universe stop spreading one day ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | what is the mass of the universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | with that thought , is the universe still expanding a theory ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | i have n't done the math to figure it out . so it 's done 30 million light years . and actually i should n't even make it the same proportion . | how is it that after 300,000 years after the big bang , two objects are 30 million light years away from each other ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | sooo ... given that the universe is constantly expanding , are light year measurements still accurate ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | but the distance that it reversed , maybe this distance right here is now 20 million light years because it got there . every time it moved some distance , the space that it had traversed is now stretched . so even though its traveled for 10 million years , the space that it traversed is no longer just 10 million light... | if space is expanding and we look at time as a fourth dimension , would time through the space also be changing as the expansion occurs ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | also , do we know how fast the universe is expanding ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | it is like , wow , i was able to cover 20 million light years in only 10 million years . it looks like i 'm moving faster than the speed of light . the reality is it 's not because the space coordinates themselves are spreading out . | what would reality looks like if the universe has expanded faster than the light speed ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | it is like , wow , i was able to cover 20 million light years in only 10 million years . it looks like i 'm moving faster than the speed of light . the reality is it 's not because the space coordinates themselves are spreading out . | is the rate of expansion of universe faster than the speed of light ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so if this was the entire observable universe , and the photon was emitted from here 13.4 billion years ago -- so 300,000 years after that initial big bang , and it 's just getting to us , it is true that the photon has been traveling for 13.7 billion years . but what 's kind of nutty about it is this object , since we... | does a star orbits or revolves around another object in space ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | but the light from that remote object is just now getting to us . and that light took 13.7 billion years to get to us . now , what i 'm going to hesitate to do , because we 're talking over such large distances and we 're talking on such large time scales and time scales over which space itself is expanding -- we 're g... | if the universe is only 13.7 billion years old , but has a radius of more than 13.7 billion light years , does n't that mean that it is expanding , or at one point has expanded , faster than the speed of light ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | now , what i 'm going to hesitate to do , because we 're talking over such large distances and we 're talking on such large time scales and time scales over which space itself is expanding -- we 're going to see in this video that you can not say that this object over here , this is not necessarily , this is not , i 'l... | what i guess i 'm asking is that there is no 'depth ' per say 'into ' the sphere between the coordinates ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . | what is the fourth dimension ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and now , where the light is after 40 million years , maybe it 's over here . so now this distance , the distance between these two points , when we started , it was 10 million light years . then it became 20 million light years . | if the universe is expanding and the distance from one coordinate to another increases , how is it possible for light to reach a destination if the distance is constantly increasing as it travels ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | so , in minute 9 of the video radius of the observable universe , is the universe expanding from the center to the outer edges , or are the outer edges expanding to the center , or is the entire universe just stretching at the same time ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | if universe is expanding , then is the distance between sun and earth also increasing ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | when the universe existed before the big bang , was the universe probably smaller than what we see today as an atom , or was it always kind of big ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | before the big bang , what was outside of the `` sphere '' of the universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | why is the universe expanding , and how do scientists measure the distance between other galaxies/stars ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | but it 's frustrated because what it thought was it only had to cover 30 million light years in distance . that keeps stretching out because space itself is stretching . so the reality , just going to the original idea , this photon that is just reaching us , that 's been traveling for -- let 's say it 's been travelin... | if space keeps growing , or if light that is just a bit slower or space stretches too much , that means we will never see the photon because space stretches too fast right ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | it seems like something that is tractable , but it really is n't . and in future videos , i 'm actually going to talk about the time scale . so we can really appreciate how long , or even start to appreciate , or appreciate that we ca n't appreciate how long 13.7 billion years is . | does time exist inside the black hole ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | well , when we say look like , it 's based on the photons that are reaching us right now . those photons left 13.4 billion years ago . so those photons are the photons being emitted from this primitive structure , from this white-hot haze of hydrogen plasma . | if all the universe 's energy came from a point 13.7 billion years ago , how can two objects be more than 27.4 billion light years apart ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | so if the universe , as well as everything inside it , is expanding , will say the distance from earth to mars expand in the next century ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | what is the speed of expansion of the universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and we 'll see that that was the range that it was emitting in . but it emits a photon . and that photon is traveling at the speed of light . it is light . | it should be slower than the speed of light , because if it was faster , the 'space-time co-ordinates ' would be stretching too fast for the photon to ever reach us , would n't it ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | well , when we say look like , it 's based on the photons that are reaching us right now . those photons left 13.4 billion years ago . so those photons are the photons being emitted from this primitive structure , from this white-hot haze of hydrogen plasma . | wait , would n't 13 billion years be the radius of the universe 13 billion years ago ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so we 're going to see this kind of white-hot plasma , white hot , undifferentiated not differentiated into proper stable atoms , much less stars and galaxies , but white hot . we 're going to see this white-hot plasma . the reality today is that point in space that 's 46 billion years from now , it 's probably differe... | why do you say we see photons from the plasma era when this is impossible ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | if we were talking about smaller time scales or i guess smaller distances , you could say approximately that . the expansion of the universe itself would not make as much of a difference . and let me make it even more clear . | what if we could travel faster than light , what would happen if we surpassed the expansion of the universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | if the universe is expanding , then how is light able to shine onto the earth ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | also , why do n't the planets slowly move away from each other if the universe continues to expand ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | it is like , wow , i was able to cover 20 million light years in only 10 million years . it looks like i 'm moving faster than the speed of light . the reality is it 's not because the space coordinates themselves are spreading out . | so does space expand faster that the speed of light ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | how fast is the universe expanding ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | well , when we say look like , it 's based on the photons that are reaching us right now . those photons left 13.4 billion years ago . so those photons are the photons being emitted from this primitive structure , from this white-hot haze of hydrogen plasma . | does light remembers the image of the star 13.4b years ago ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so you ca n't just multiply a rate times time on these cosmological scales , especially when the coordinates themselves , the distance coordinates are actually moving away from each other . but i think you see , or maybe you might see , where this is going . ok , this photon says , oh , in another -- let me write this ... | now , back to our 4d sphere , is there another `` hemi-4d-sphere '' , or any area , that we could never see from the earth ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | well , when we say look like , it 's based on the photons that are reaching us right now . those photons left 13.4 billion years ago . so those photons are the photons being emitted from this primitive structure , from this white-hot haze of hydrogen plasma . | is n't the estimate of the universe 4.6 billion years old ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | this is where i guess in the depiction the remote object was . but the light from that remote object is just now getting to us . and that light took 13.7 billion years to get to us . now , what i 'm going to hesitate to do , because we 're talking over such large distances and we 're talking on such large time scales a... | how do we know how long it took for light to reach us ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and we 'll talk more about that in a future video . but let 's just think about two points in this early universe . so in this early universe , let 's say you have that point . | why does the space between two points in the universe get larger ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so when we looked at that depiction -- this i think was two or three videos ago , of the observable universe -- i drew , it was this circle . and when we see light coming from these remote objects -- that light is getting to us right here . this is where we are . | but , there is another theory , that the universe will eventually come closer together , opposite of the expansion theory , in that period , would n't the sky above earth be constantly bright , because the light is now coming at us , while we are going at them ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | i 'm talking about an object over there . but we could even talk about that coordinate in space . and actually , i should say that coordinate in space-time , because we 're viewing it at a certain instant as well . | i just ca n't understand how someone could measure long intergallatic , interstellar or even interplanetary distances , i mean , okay i can see through my telescope that star a and star b are pretty far away , but how could i know whitch one is furthest from earth ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and that photon is traveling at the speed of light . it is light . and so that photon , says , you know what , i only got 30 million light years to travel . that 's not too bad . | i know you can guess by how long has the light travelled , but how could you know how long it has travelled in the first place ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so let 's go 300,000 years after that initial expansion of that singularity . so we 're just 300,000 years into the universe 's history right now . so this is roughly 300,000 years into the universe 's life . i guess we could view it that way . and first of all , at that point things have n't differentiated in a meanin... | would or could that photon exist in our 300,000 year old universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and we 'll see that that was the range that it was emitting in . but it emits a photon . and that photon is traveling at the speed of light . it is light . | do these numbers change if we use the example of a photon traveling `` with '' the expansion as opposed to `` against '' the expansion ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | 1- is universe expanding faster than speed of light ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and i want to make it very clear . this object is now 46 billion light years away from us . when we just use light to observe it , it looks like , just based on light years , hey , this light has been traveling 13.7 billion years to reach us . | 2- when we see a planet , how can we know it 's 1 light year away from us ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | is the expansion of space measurable ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | but it emits a photon . and that photon is traveling at the speed of light . it is light . | do we know if the outward growth is limited to the speed of light ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | if the universe is expanding are we to assume that everything in it ( including human beings ) are `` expanding '' as well ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | am i misunderstanding the concept of expansion in the universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | what are the physics behind the universe expanding faster than the speed of light ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | but the reality is after 40 million years -- so another 40 million years go by -- now , all of a sudden , the universe has expanded even more . i wo n't even draw the whole bubble . but the place where the photon was emitted from might be over here . | can we even postulate about such things , if the current laws of physics do n't seem to apply ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and i want to make it very clear . this object is now 46 billion light years away from us . when we just use light to observe it , it looks like , just based on light years , hey , this light has been traveling 13.7 billion years to reach us . that 's our only way of kind with light to kind of think about the distance ... | could there be a light coming from let 's say 15 billion light years away but just not reach us yet ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | when that light was emitted , we were much closer to that coordinate . this coordinate was much closer to that . where we are in the universe right now was much closer to that point in the universe . the other thing to think about is as this -- let me actually draw it . | could the universe be much larger than what we estimate it is ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | this distance that was 30 million light years now -- and i 'm just making rough numbers here . i do n't know the actual numbers here . now , it is actually -- this is really just for the sake of giving you the idea of why -- well , giving you the intuition of what 's going on . | which i know is true but my question is where is the point of origin ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is roughly 300,000 years into the universe 's life . i guess we could view it that way . and first of all , at that point things have n't differentiated in a meaningful way yet right now . | what will happen to earth when andromeda and the milky way collide ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | alright , i have a question : if everything is expanding away from where the big bang happened , which should logically be the center of the universe , are n't we also moving away from the center of the universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and we 'll talk more about that in a future video . but let 's just think about two points in this early universe . so in this early universe , let 's say you have that point . | what 's the speed of expansion measured between two opposite outermost points of universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so what we 're going to see is this white-hot haze . so we 're going to see this kind of white-hot plasma , white hot , undifferentiated not differentiated into proper stable atoms , much less stars and galaxies , but white hot . we 're going to see this white-hot plasma . | what is `` white-hot plasma '' ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and actually , let me make something clear . if i 'm drawing the whole observable universe , the center actually should be where we are . because we can observe an equal distance . | why are we at the center of the observable universe ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | 10 million years go by . the universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . | if this is about the `` observable '' universe , what qualifies as `` unobservable '' ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and now , where the light is after 40 million years , maybe it 's over here . so now this distance , the distance between these two points , when we started , it was 10 million light years . then it became 20 million light years . | - does the universe expand uniformly and do all points move apart the same distance ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and there 's a couple of reasons to think about it . first of all , think about it , that light was emitted 13.7 billion years ago . when that light was emitted , we were much closer to that coordinate . | - the photons that were emitted 13.7 billion years ago were travelling at a consistent speed ( speed of light ) ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | but it emits a photon . and that photon is traveling at the speed of light . it is light . | is it possible that the speed of photons and thereby light change ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | this is now 100 million light years . and now , maybe this distance right here is -- i do n't know -- 500 million light years . and maybe now the total distance between the two points is a billion light years . | at inception the matter was closely packed and there was less distance between the cosmic bodies , so is n't it possible that the light was passing through matter rather than vacuum ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | is the earth expanding along with everything else , or is it excluded from the expansion ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | well , when we say look like , it 's based on the photons that are reaching us right now . those photons left 13.4 billion years ago . so those photons are the photons being emitted from this primitive structure , from this white-hot haze of hydrogen plasma . | why do scientist believe that the universe is 13.7billion years old ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | now , it is actually -- this is really just for the sake of giving you the idea of why -- well , giving you the intuition of what 's going on . this distance now is no longer 30 million light years . maybe it 's 100 million . | with distance growing , would ( for sake of discussion , traveling at light speed ) it actually take longer to get to alpha centari than the 4.3 light years ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | and is there a `` galactic speed '' that the universe is expanding at ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | but it 's frustrated because what it thought was it only had to cover 30 million light years in distance . that keeps stretching out because space itself is stretching . so the reality , just going to the original idea , this photon that is just reaching us , that 's been traveling for -- let 's say it 's been travelin... | if you stretch a rubber band enough you will snap it , can the universe keeps stretching itself until it snaps ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and we 'll see that that was the range that it was emitting in . but it emits a photon . and that photon is traveling at the speed of light . it is light . | but the reaching of that photon would be possible only if the rate of expansion of the universe was a bit slower than the speed at which that photon was coming towards us , right ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | and we 'll see that that was the range that it was emitting in . but it emits a photon . and that photon is traveling at the speed of light . it is light . | first of all , can the rate of expansion even be compared to the speed of that photon ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | so this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | how fast is the space in the universe expanding ? |
right now , the best estimate of when the big bang occurred -- and once again , i do n't like the term that much because it kind of implies some type of explosion . but what it really is is kind of an expansion of space , when space started to really start to expand from a singularity . but our best estimate of when th... | i 'm talking about an object over there . but we could even talk about that coordinate in space . and actually , i should say that coordinate in space-time , because we 're viewing it at a certain instant as well . | if space is expanding , does this mean that we could theoretically stretch and compress space to create warp speed ? |
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