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It's kind of like this:
http://casa.colorado.edu/~ajsh/sr/lorwhe…
If you were in another portion of the universe, our part of the universe would look like a lorentz contacted smear which had only aged for a few seconds. When we look a that portion of the universe, it looks like a lorentz contracted smear which has only aged for a few seconds.
It's kind of a weird symmetry called the twin paradox. When we look at something traveling near the speed of light, we see the very atoms as they condense into hydrogen. (called the surface of last scattering or http://en.wikipedia.org/wiki/Cosmic_micr… )
When the look back at us, they will think THEY are the ones that live in a 13.7 billion year old universe, and they will think hat WE are just atoms beginning to form.
Edit: I read two other answers who claimed the universe was finite in mass. I disagree. If it were finite in mass, there would be a center of mass, and we would collapse toward it. If infinite in mass, then there would be symmetry, and no preferred direction to collapse.
http://casa.colorado.edu/~ajsh/sr/lorwhe…
If you were in another portion of the universe, our part of the universe would look like a lorentz contacted smear which had only aged for a few seconds. When we look a that portion of the universe, it looks like a lorentz contracted smear which has only aged for a few seconds.
It's kind of a weird symmetry called the twin paradox. When we look at something traveling near the speed of light, we see the very atoms as they condense into hydrogen. (called the surface of last scattering or http://en.wikipedia.org/wiki/Cosmic_micr… )
When the look back at us, they will think THEY are the ones that live in a 13.7 billion year old universe, and they will think hat WE are just atoms beginning to form.
Edit: I read two other answers who claimed the universe was finite in mass. I disagree. If it were finite in mass, there would be a center of mass, and we would collapse toward it. If infinite in mass, then there would be symmetry, and no preferred direction to collapse.
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Humans intelligence is limited and will never be able to answer where space ends.
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No one knows if it's really unending. We can only see up to a certain point in space anyway.
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The universe is not infinite. It's just really big.