“We’ve only seen surfaces like this on active worlds like Earth and Mars,” mission co-investigator John Spencer said in a statement. “I’m really smiling.”
Meanwhile, we've also got some new mountains:
The newly named Hillary Montes are an homage to Sir Edmund Hillary, half of the pair who first climbed Mount Everest in 1953. Tenzing Norgay, his fellow climber, was already honored with a Plutonian range. The Hillary mountains are comparable in height to the Appalachian Mountains of Earth, while the Norgay peaks are more like the Rockies.
"For many years, we referred to Pluto as the Everest of planetary exploration,” New Horizons Principal Investigator Alan Stern said in a statement. “It’s fitting that the two climbers who first summited Earth’s highest mountain, Edmund Hillary and Tenzing Norgay, now have their names on this new Everest.”