An image with enhanced colors to show differences in the composition of Pluto’s surface.
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Evidence is mounting for an ocean at Pluto, buried beneath its frozen heart. Scientists said Wednesday that Pluto may have rolled over on its axis eons ago, the result of tidal forces with jumbo moon Charon. The spacecraft is now over 587 million kilometers from Pluto and en route to a 2019 close approach of another faraway orb.More likely, the nitrogen ice-coated basin has extra-mass – below the surface – to cause Pluto to reorient itself and have Sputnik Planitia on the opposite side of the dwarf planet as Charon.Close to the sun, meanwhile, Mercury has a big new valley.The spacecraft orbited Mercury for four years before crashing deliberately into the innermost planet last year.
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