Quote:
Originally Posted by GrimUpNorth
If the universe is expanding, and everything is moving away from everything else, how can we be on a collision course wth Andromeda?
I've watched every episode of How The Universe Works on Discovery and still don't understand it.
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Because Andromeda can be moving faster than the expansion. Imagine you are running down a corridor that is getting longer, as long as you can run faster than the expansion you will get to the end.
The noggin scratcher is if the edge of the universe is expanding faster than light then you can't even SEE what is beyond, let alone get to it.
I can answer some questions but I'm not going to be defending the truth of the big bang theory - if you don't believe fine I don't care. All cosmology is nuts -- scientific or otherwise, but some of it has empirical backing.