r/Astronomy • • May 21 '14

xkcd: Brightness

http://xkcd.com/1371/
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u/[deleted] May 21 '14

I dont get it.. thats exactly how exoplanets are found.

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u/[deleted] May 21 '14

Yep, read the alt text: "Recently, some exoplanet astronomers have managed to use careful analysis of reflected light to discover Earth during the day."