Take another look at that link provided by Speedfreek. I don't think it can be explained much better than that.
Originally Posted by DanishDynamite
Note: One cannot (accurately) picture the universe as if you're looking down on a little spherical model. It's the relativity, stupid! (No, not you! That's a take-off from an old Clinton saying.) There's no absolute time. No absolute frame of reference. The light you're seeing now may have been emitted billions of years ago.
Everyone is entitled to his own opinion, but not his own facts.