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Moon Losing Its Water

The moon loses more water than it receives from the solar wind or meteorites. How long has that been going on?

Pluto Is Young

The New Horizons science team is stunned by surface features on Pluto and its large moon Charon that cannot be billions of years old.

Saturn's Rings Impacted by Meteoroids

Cassini has observed clouds of dust from meteoroids hitting the rings. The data will "impact" theories of the rings' origin and age.
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