![Mysterious Ice Plains Spotted on Pluto [Video]](http://www.scientificamerican.com/sciam/cache/file/4266682C-D6E1-4EAB-B72A34F95566586A_small.jpg)
“Sputnik Planum” region is a vast stretch of icy plains whose surface is broken into cell-like polygon blocks by snaking troughs --
“Sputnik Planum” region is a vast stretch of icy plains whose surface is broken into cell-like polygon blocks by snaking troughs --
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