Question: How much of the universe do you think we've seen so far?

Christopher Phillips answered on 21 Jun 2011:

Our telescopes can look out to about 13.5 billions light years. When we look out we are looking back into time to only a few hundred million years after the Big Bang took place. We can almost see back to the very beginning of the universe! Incredible for us to be able to do that, don’t you think? 🙂