Emily Lakdawalla • January 22, 2016
Randall Munroe is a genius at disguising seriously educational infographics as funny jokes. Behold today's xkcd: "Possible Undiscovered Planets," a reference, of course, to yesterday's announcement of theoretical evidence for a possible, distant ninth planet. Visit the xkcd site to enjoy the mouseover text (use this link if you're on a mouseless device).
Senior Editor and Planetary Evangelist for The Planetary SocietyRead more articles by Emily Lakdawalla
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