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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 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 . | how can an object that is emitting light be 46 billion light years away if the universe is only 13.7 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... | 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 . | another question i have : is the observable universe getting larger as time goes on ? |
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 . | in another billion years , the size and scope of the observable universe will have expanded , 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... | but it emits a photon . and that photon is traveling at the speed of light . it is light . | did the big bang exceed 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 that coordinate , where the photon roughly gets in 10 million light years , is about right over here . the whole universe has expanded . all the coordinates have gotten further away from each other . | before the big bang occurred the whole universe was just a single point , 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... | 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 . | ca n't there be such numerous points which never got the chance to become a full fledged universe or if they have developed into universe but we can never know their existence ? |
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 the universe if stretching , then why are n't we being stretched and dying ? |
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 . | so , if light has to travel the distance to get to earth as explained in the video , does that mean at the beginning of earths time there was no 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... | 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 there a reason why `` sal '' said 13.4 billion light years and wrote 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... | 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 find this extremely fascinating ... my question is ... is the universe still expanding with each passing year from the big bang ( 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... | so it 's done 30 million light years . and actually i should n't even make it the same proportion . because the distance it 's gone and the distance it has to go , because of the stretching , it 's not going to be completely linear . | does n't that make the universe infinite ? |
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 . | we are traveling from that distant object is 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... | 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 . | but did we receive a photon that was emitted 13.7 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... | but it emits a photon . and that photon is traveling at the speed of light . it is light . | confused in re : to the expansion rate of space vs. 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 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 . | otherwise your photon would never 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... | 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 . | so must have expanded faster than the initial emission of this 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... | 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 . | another question i have : in a recent video sal said light is the fastest thing we can comprehend , but is the expansion of the universe faster that 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... | 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 . | i want to ask that is there any limit till which universe will 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... | 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 . | does that mean , assuming values that the current estimated radius of 46 billion lys , that the `` edge '' of the observable universe is moving away from us , at about : 46,000,000,000 / 3,260,000 ( 1 megaparsec ) * 74.3 ? |
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 i really just want to give you the idea of what 's going on here . so let 's just say , well , that photon says in about 10 million years , in roughly 10 million years , i should be right about at that coordinate . i should be about one third of the distance . | roughly 1.048 x 10^8 m/s ? |
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 . | maybe i 'm just overthinking this , but if the theoretical distance between the two points is 46 billion light years , and the universe is only 13.7 billion years old , how does that work ... given that 46 billion light years means that a photon would be traveling for 46 billion years at the speed of light , for it to ... |
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 . | the photon ca n't accelerate any faster during its journey , so what am i missing exactly ? |
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 if i walk at 1 m/s for 1 second ... i have actually travelled a little more than 1 meter because 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... | what will this look like ? 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 . so what we 're going to see is th... | what happen to the photons after it reaches your 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... | 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 . | does it mean it is possible that there is more universe that we ca n't see because the light has n't got to us yet or might never get to us taking in to account the age of the earth and 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... | well , over the course of those 10 million years , the universe has expanded some . the universe has expanded maybe a good deal . so let me draw the expanded universe . so after 10 million years , the universe might look like this . actually it might even be bigger than that . | and if that were the case might it be possible that the universe is older that current thought ? |
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... | those are getting thin . so the photon is just moving at the speed of light . but the distance that it actually traversed in 10 million years is more than 10 million light years . | would n't the photon emitted from the object still be moving ? |
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... | those are getting thin . so the photon is just moving at the speed of light . but the distance that it actually traversed in 10 million years is more than 10 million light years . | so in 'reality ' the photon is moving away ? |
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 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 . | we know the age of the universe by viewing distant objects 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... | 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 . | so how do we know it 's not much older since we can only look back to a certain horizon ( 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... | 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 . | if the observable universe is expanding at 70 km/s , and light travels at 300 000 km/s , how is it that an object at the extremity of our observable universe is 46b light years 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... | the other thing to think about is as this -- let me actually draw it . 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 . | why is n't the expansion approximately equal to approximately ( 1 + 70/300 000 ) x ( the number of 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... | 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 . | well the universe started to expand from the big bang but what was there before the bing bang and what is it that triggered the bing bang and led to the creation of universe that we know ? |
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 it possible for something to travel faster than the speed of light ( like 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... | but it emits a photon . and that photon is traveling at the speed of light . it is light . | next question is the speed of light constant always ? |
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 the speed of light change equally with time and 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... | so this is 10 million years into the future . still on a cosmological time scale , still almost at kind of the infancy of the universe because we 're talking about 13.7 billion years . so let 's say 10 million years . | here is an unrelated but mind boggling question : if what physicists say is true and that the faster you move relative to other points in the universe , the slower you perceive time , does this mean that due to dark energy and the accelerated expansion of the universe , that even if you were standing still , time will ... |
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 . | so , if our technology advanced enough to actually sense photons from 13.7 billion years ago , then we can probably literally see what happened at the 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... | 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 the 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... | 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 . | where would the center of the universe be ? |
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 . | what set of data and/or calculation ( s ) produces the size of the universe being about a radius of 46 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... | 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 . | how do you calculate distances in the cosmic scale ? |
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 . | also , if the visible end of the universe is 13.7 billion light years away and it takes a photon 46 billion light years to travel to us , would n't that make the length of the universe 46x2 ? |
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 . | if each expansion increases the universe then would n't each increase also increase 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... | 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 . | could it be possible that the expansion of space is not accelerating but slowing ? |
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 constantly expanding , and the distance between any two objects is constantly increasing , then would n't that mean the distance between the sun and the earth , or the earth and the moon constantly increase ? |
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 ... | so if we had an extremely powerful telescope , in theory , could we look into the past and see the big bang happen ? |
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 ... | if the fastest matter can travel is light speed , an no light has been traveling for more than 13.8 b years , would the observable universe be the end of the matter 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 space is expanding , does it mean that also the content of the space 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... | so this is 10 million years into the future . still on a cosmological time scale , still almost at kind of the infancy of the universe because we 're talking about 13.7 billion years . so let 's say 10 million years . | does space still exist there ? |
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 , over the course of those 10 million years , the universe has expanded some . the universe has expanded maybe a good deal . so let me draw the expanded universe . so after 10 million years , the universe might look like this . actually it might even be bigger than that . | will the universe become hollow like the thickness of the balloon ? |
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 . | since the universe is expanding , and light always travels at a constant speed in space , would n't the observable universe shrink with 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 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 . the reality today is that point in space that ... | if there really is a civilization on the object that sal mentioned , and they are able to see us as a primitive state of white-hot plasma when the universe was beginning to take shape , how come we see that 'object ' as it is now when it would have formed into stars , galaxies or other cosmic objects ? |
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 , is the universe expanding at the same speed that light 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... | 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 . | how we know when something is a 2 billion light years , how we know how much that photon travel 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 light traveled 46 billion light years in 13.7 billion years , what is the actual distance the photon traveled , considering the stretching of the 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... | 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 . | why is it that as the universe expands , and the distance needed to travel increases , the amount of years taken to travel is still constant ? |
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 our universe collided with another spiral would n't the black hole in the center suck them both 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 . | what is the thing that the universe expands into ? |
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 is the age of the universe determined ? |
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 . | if the universe continues to expand , how does this effect the speed of light constant ? |
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 . | how can we estimate the size of the universe if we are receiving the photons of the light emitted billions of 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... | 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 n't our estimate state the size of the universe at that 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... | 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 . | ok so if the big bang started the universe does that mean that gravity existed before 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... | the other thing to think about is as this -- let me actually draw it . 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 . | how can in 300'000 years be a universe 30e6 light-years long ? |
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 . | does universe 's stuff , or its borders , i do n't know , not obey speed of light limit ? |
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 . | how can the borders accelerate and not the gain kinetic energy that impedes stuff from reaching 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... | 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 . | so here 's my question , should n't a photon approach earth by the speed of light regardless of 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... | that distance now might be on the order of -- maybe it 's on the order of 30 million light years . and the math is n't exact here . i have n't done the math to figure it out . | is n't that the fundamental statement the theory of relativity makes ? |
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 . | so , what sal 's saying in this video is that the 4th dimension of the 4-d shape with the 3-d surface ( our universe ) is 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 . | i assume they are not traveling faster than the speed of light , so how fast would this mean 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... | 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... | another possibility is that these numbers are really just for show and they really have no value ; does anyone have examples of real values ? |
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 the photon is just moving at the speed of light . but the distance that it actually traversed in 10 million years is more than 10 million light years . 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... | andromeda is approximately 2.5 million light years from earth , so am i correct in saying if some how we could see andromeda with the naked eye , we would see it how it existed 2.5 million 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 this is now 100 million light years away from each other . the universe is expanding . these coordinates , the space is actually spreading out . | so the universe might be expanding , but if the light eventually reaches us it 's not expanding faster then 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 actually maybe we should put us at the center . 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 ... | sal said the photon 's lift was emitted 13.4 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... | 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 . | does that mean that the photon has more energy during the middle part of the journey ? |
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 universe has expanded . this coordinate , where we 're sitting today at the present time , is now all the way over here . that coordinate where the photon was originally emitted is now going to be sitting right over here . and that photon , it said , ok , after 10 million light years , i 'm going to get over there ... | ( time in video : 0 if applicable to a specific time ) does the velocity of the photon in the direction of travel change as space-time expands ? |
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 . | in other words , the distance travelled does increases because of expansion , the distance left increases because of expansion , but is the velocity of the photon altered in any way ? |
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... | and what about the speed of light itself , could that have been influenced by the expansion of space-time , or was that a constant right from the start ? |
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 a slow or fast rate ? |
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 . | put another way , if at any given point in time the universe has a finite dimension , what 's on the outer side into which it 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... | 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 . | - if the earth still existed in 13.7 billions years from now , would there be no stars visible in the sky ? |
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 . | - is the expansion of the universe the reason why stars seem to be flickering at night ? |
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 . | could this explain the recent observation of a particle appearing to travel 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... | well , over the course of those 10 million years , the universe has expanded some . the universe has expanded maybe a good deal . so let me draw the expanded universe . | ~ so maybe the particle they observed also seemed to be going slightly faster because space had expanded a little ? |
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 . | how can the universe be 13.7 billion years old and the `` edge '' of the universe be about 13.7 billion lightyears away ? |
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 say 10 million years . 10 million years go by . the universe has expanded . | also when sal started talking about the photon going from one point to another , then after 10 million years the distance the distance it had to go increased , how is that possible ? |
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... | the photon is going faster then its moving destination , so would n't the distance only get smaller and smaller ? |
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 other thing to think about is as this -- let me actually draw it . 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 . | how radius of a 300,000 years old universe could be more than 600,000 ly ( 300,000 ly in all directions ) , up to 100 mly , if nothing , and thus neither the expansion of universe , can go 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... | 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 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... | 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 . | how do you know how far this photon has been traveling ? |
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... | what will this look like ? 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 . so what we 're going to see is th... | is there a scientific way to distinguish photons based on age ? |
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 actually traversed in 10 million years is more than 10 million light years . 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... | if the photon had traveled 20 million light years and still had 80 million to go and space kept on expanding and the distance between us kept increasing how would it ever 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... | 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 relationship between the universe expanding and the progression of the photon is non linear - would n't this result in distant galaxies appearing to age slower , and at an exponentially decreasing rate ? |
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 . | so in theory we should be able to detect the very moment of the big bang ? |
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 ... | if the expansion is near the speed of light then we have light and matter all around us traveling with us through this expansion at the same velocity as we are from this so called big bang ? |
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 space is an infinitely expanding area and also it is like a never ending circle ? |
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 do n't know much about these things so i have a question : is universe is 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... | but it emits a photon . and that photon is traveling at the speed of light . it is light . | for my own understanding , and maybe that of others , is that basically because the universe is assumed to be traveling at near-light- to 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... | 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 . | hi sal , in the example `` '' , how could the distance between two points in the universe be 30 million light years if the whole universe has only been expanding for 300k light years ? |
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