Data from NASA's New Horizons spacecraft suggest that a syrupy ocean filled with ammonia could dwell beneath Pluto's icy shell.
There is no direct evidence for an ocean on Pluto, but scientists argue it's very likely, given that a subsurface ocean would explain the planet's particular rotation and tectonics. In a recent paper published in the journal Nature, researchers mused that an ocean at extremely low temperatures could be maintained if it contained ammonia. Ammonia has also been detected by the New Horizons probe on two of Pluto's moons.
"It expands our ideas on what oceans can be," said Bill McKinnon, a Washington University professor and co-principal investigator of the New Horizons Mission. "We'll probably find, ultimately in our exploration, that things are even stranger than we think."