There are signs that Pluto is geologically active.
Images relayed by the first spacecraft to visit the planet show icy plains covered in uniform formations in the shape of polygons.
VIDEO: NASA's New Horizons team debuts a 'flyover' graphic of #Pluto's frozen plains. http://t.co/QHb9lyqwnK— Reuters Top News (@Reuters) 17 Juillet 2015
There are also clusters of hills and mountains.
Experts say the images, taken by the New Horizons mission which l…
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