Quote Originally Posted by Yora View Post
http://xkcd.com/1125/

Oh god, this one had me cracked up!

Took me a moment, I first thought it was about imperfect mirrors in observatories.
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He discovered the expansion of the universe by noting the red shift of the light from other galaxies.
Thanks for explaining. I guess I should know that stuff but... meh. Can't know everything.