Across the Universe

For some reason I find this really cool.  I think it is the fact that this happen 7.5 billion years ago and we are now just seeing it. It's boggling.  And if anyone knows how they figure this happened halfway to the edge of the universe, let me know.  How do they know where the edge is?

http://www.cnn.com/2008/TECH/space/03/21/exploding.star.ap/index.html