Space is big

From the Hitchhikers' Guide to the Galaxy:
"Space," it says, "is big. Really big. You just won't believe how vastly hugely mindbogglingly big it is. I mean you may think it's a long way down the road to the chemist, but that's just peanuts to space, LISTEN!" and so on...

"But how big is 'mindbogglingly big?'" you might ask. It's this big:

http://www.phrenopolis.com/perspective/solarsystem/