Check out this little slide show... shows how insignificant you really are http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/index.html
Hmm very neat I think. One of my favorite theorys to think about as well, with all of this, we (the universe as we see it), may just be some babies new toy that he got for his birthday. Think about it
This can make you feel small, true. But at the same time it can make you feel extremely large. Even though we are much smaller than the galaxies, we are incredibly larger than the sub atomic particles that compose us. In both senses though, it tends to put things in prespective. We are so small, yet also so big. We never tend to realize it. The things that compose us, the things going on at that tiny level are vital to our lives, and we know nothing of it in daily life. And the cosmos, so much grander than anything we know, are largely ignored. This universe is truely a system of such staggeringly diverse and complex beauty.