Where were all of the things a long time ago? Can we find out by looking at things now?
Some of my friends and I use big computers to try to find out where stuff was — all of the stuff, in every place out in space — in the first tiny part of a second, at the beginning of time. We do this by looking at where all of the stuff in space is now, and trying to guess what that means about where stuff was before. But it is very hard to do that, even with a big computer….
Read more "Where were all of the things a long time ago? Can we find out by looking at things now?"