PLUTO could hide a liquid ocean beneath its icy shell. Indeed, other bodies on the solar system鈥檚 frigid fringe could also harbour subsurface oceans, and these could provide the conditions to sustain life.
Temperatures on Pluto鈥檚 surface hover around -230 掳C, but researchers have long wondered whether the dwarf planet might boast enough internal heat to sustain a liquid ocean under its icy exterior.
Now Guillaume Robuchon and at the University of California, Santa Cruz, say there is a good chance it does. They calculate that an ocean depends on two things: the amount of radioactive potassium in Pluto鈥檚 rocky core, and the sloshiness of the ice that covers it.
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Density measurements suggest a rocky core fills 40 per cent of the dwarf planet鈥檚 volume. If the core contains potassium at a concentration of 75 parts per billion, its decay could produce enough heat to melt some of the overlying ice, which is made of a mixture of nitrogen and water.
聯The decay of potassium could produce enough heat to melt some of the overlying ice聰
It should have at least that much potassium and probably more, says at Washington University in St Louis, Missouri. He points out that Earth, which probably formed with less of the volatile element due to its closer distance to the sun, has 10 times that concentration in its core.
But merely having a source of heat is not enough to maintain a long-lived ocean. Heat from the core will trigger convection in the surrounding ice, and if the ice churns too quickly, the heat will simply escape into space before it can do much melting. If it flows substantially more slowly than Antarctic glaciers on Earth, however, then the top 165 kilometres of ice could provide enough insulation for a liquid ocean of the same depth to exist below, the team calculates ().
The viscosity of the ice depends on the size of individual ice particles, with smaller grains flowing more easily. There is no way to measure this from Earth, but Pluto鈥檚 shape could reveal evidence of an ocean, the team says. Pluto鈥檚 spin is slowing down due to tugs from its large moon Charon. Fast-spinning objects bulge out at their equator, but a soft interior would allow the world to relax into more of a sphere as its spin slows down. NASA鈥檚 New Horizons probe will image the dwarf planet鈥檚 shape when it flies past in 2015.
Other distant icy bodies might also have oceans, which could mean that the outer solar system is potentially ripe for life. 鈥淚t鈥檚 very exciting to think that these dwarf planets could have astrobiological potential,鈥� says New Horizons lead scientist .
