Emily Lakdawalla • Jan 22, 2016
xkcd: Possible Undiscovered Planets
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).
![xkcd: Possible Undiscovered Planets](https://planetary.s3.amazonaws.com/web/assets/pictures/_576x542_crop_center-center_60_line/88503/20160122_possible_undiscovered_planets.jpg 576w)
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