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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?

Dust a Major Problem on Non-Earth Worlds

You can't just beam down to a planet and start walking around. That dust under your feet can cause major problems.

Of Molecules and Men

Atoms and molecules are tiny but can have a big influence on the habitability of planets and astrobiologists' theories about them.
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