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NASA's Dawn Mission has found permanently shadowed craters on Ceres.

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These craters are at the dwarf planet's poles, where they receive no sunlight.

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Ceres has just enough gravity to retain water molecules.

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If a shadowed crater remains below about -240 degrees Fahrenheit 

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it is a cold trap.

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Shadowed craters on Ceres are cold enough to have been collecting ice over billions of years.

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Scientists will investigate further as Dawn continues to explore Ceres.