Image via Wikipedia
If you need to see things in their proper perspective, I recommend this site. (Hat-tip: Michael Darling.)
I’m not up to attempting the math, but I wonder if we’re really positioned right in the middle as shown. I think the small end may be smaller than the big end is big (if that makes any sense.) But seeing as both ends of the scale are pretty much unimaginable I guess it doesn’t matter all that much.