I am going to try to answer another Ask a ScienceBlogger question. This one is from George P. Burdell. He asks:
“If the universe is expanding from the big bang, has anyone tried to reverse plot the galaxies to figure out the exact point where the big bang occurred?”
Actually, he asked two questions, but I am just answering the first. Second, let me note that I am not really a cosmologist – so I am just making up answer.
In short, the answer is that everywhere is the center of the universe. Think of it this way. Imagine that there are only two dimensions and these two dimension are the surface of a balloon. Also, this balloon is expanding. Here is the balloon at two different times with two locations.
If I let this go back in time so that the balloon gets smaller, points A and B get closer together. If the balloon could super-shrink, they would both be at the center. The problem is that with this balloon example, everyone wants to think of the whole balloon as the universe. However, just the surface of the balloon is like the universe in this case.
That is my answer. I tried to keep it simple.