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National Geographic is the source for photos, free desktop wallpapers of places, animals, nature, underwater, travel, and more, as well as tips and photographer bios.

National Geographic Environment Home Page.

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The Jet Propulsion Laboratory is the lead U.S. center for robotic exploration of the solar system, and conducts major programs in space-based Earth sciences and astronomy. JPL spacecraft have visited all of the planets from Mercury to Neptune.

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