Since the universe is always expanding then doesn't that mean theoretically there is an "edge" where stars and galaxies just haven't expanded to yet. It would just be empty space forever right? (at least until the universe expanded that far)
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answers:
RAT M say: I've been living on the edge so long ; Where the winds of limbo roar .
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Tom S say: There is an "observable edge" otherwise, no, no edge, or center.
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scowie say: The universe isn't actually expanding at all. The galaxies are not generally receding from each other as their redshifts are not predominantly due to recessional velocity. They are due to light losing energy through it's interaction with the molecular hydrogen that fills intergalactic space (see source).
If space expanded, as well as stretching out the energy of light radially causing distant galaxies to appear redshifted, it would stretch it out transversely causing a reduction in their surface brightnesses. This is not what we observe:
http://www.sci-news.com/astronomy/scienc...
Expanding space would also stretch out the light curves of quasars (their oscillation in luminosity). No sign of this either:
http://phys.org/news190027752.html
There never was a Big Bang and the universe is probably infinite in time and space, i.e. there is no centre, edge, beginning or ending. This documentary may enlighten you:
https://www.youtube.com/watch?v=IFFl9S39...
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Poseidon say: Hi ABumpInTheRoad,
There is an edge to the universe but it is being stretched constantly by the expanding system which is the 'known' universe.
Although scientist believe they have reached and can see to the edge with the help of Hubble they can't see beyond it.
Poseidon
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PhotonX say: You are at the edge of the Universe, and so is every place else. You're also at the center of the Universe, and so is everyplace else. You're problem is that you're trying to intuitively understand a multidimensional space with your 3-dimensional mind, and that's simply not going to happen.