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Pluto and the other Kuiper Belt dwarfs are about as cold as they can get, barely above absolute zero. Pluto's range is from about 33°K to 55°K (-240° to -218°C). Ceres orbits outside Mars, close enough for solar heating. But lacking an atmosphere, its surface retains little warmth, never getting much above -34° C. (Liquid water may exist under its surface.)

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16y ago

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