Brandon Fibbs · @bfibbs
17th Jul 2015 from TwitLonger
"We have not found a single impact crater on this image." Given enough time, any solid surface in the solar system is going to get whacked by interplanetary debris. So the lack of craters tells planetary geologists that this part of #Pluto must be relatively young — no older than about 100 million years. "It could be active right now."
http://www.skyandtelescope.com/astronomy-news/pluto-and-charon-dazzle-with-diversity-07162015/