If you can look at this picture and "get it", it will blow your mind. It's no wonder people call it the most important picture humanity has ever taken.
Not a plug for Nikon, but they do put out a pretty awesome interactive "scale of the universe" thing. The attention to detail is noticably more than the htwins one. You can find it here: http://www.nikon.com/about/feelnikon/universcale/index.htm
If you can look at this picture and "get it", it will blow your mind. It's no wonder people call it the most important picture humanity has ever taken.