Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the drug store, but that's just peanuts to space.permalink source: Douglas Adams, "The Hitchhiker's Guide to the Galaxy"
Everything you've learned in school as "obvious" becomes less and less obvious as you begin to study the universe. For example, there are no solids in the universe. There's not even a suggestion of a solid. There are no absolute continuums. There are no surfaces. There are no straight lines.permalink source: R. Buckminster Fuller
A Russian astronaut and a Russian brain surgeon were once discussing religion. The brain surgeon was a Christian but the astronaut was not. The astronaut said, "I've been out in space many times but I've never seen God or angels." And the brain surgeon said, "And I've operated on many clever brains but I've never seen a single thought."permalink source: Jostein Gaardner, Sophie's World 230