Talk:1441: Turnabout

Explain xkcd: It's 'cause you're dumb.
Revision as of 06:45, 31 October 2014 by Davidy22 (talk | contribs)
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In the few seconds the photons take to get to the moon and back, the earth has moved enough on its axis that the reflected beam from a perfect retroreflector is not gonna hit the protagonist.

The retroreflectors for the Apollo missions were deliberately spoiled so they return six slightly offset beams, angled such that photons from one of them will go back near enough to the source.

Oh, and of course there's also the whole r^4 thing too. ‎ (talk) (please sign your comments with ~~~~)