[Kato]

Originally Posted by Yora

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.

Spoiler

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.