On Pluto, more rocks and less ice

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Pluto, a dwarf planet almost 5 billion kilometers (km) away from Earth, has an average surface temperature of -230 degrees Celsius (ºC) and may be made up of a greater proportion of rocks than the 60% to 70% already estimated – the rest is ice. That possibility would make it more like Triton, one of Neptune's moons, and less like Callisto and Europa, the icy moons of Jupiter to which it has been compared. Triton should be about 75% rock and iron and Callisto 60%.

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Pluto's impact craters, with diameters between 5 km and 60 km, to the left of the Sputnik plain (brighter area, in balloon shape) | Credit: NASA/JHUAPL/SwRI

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