IMAGES: Not of This World

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Science  17 Sep 2004:
Vol. 305, Issue 5691, pp. 1687
DOI: 10.1126/science.305.5691.1687b

There may not be life elsewhere in the solar system, but there is geology, such as Mars's 24-kilometer-tall volcano Olympus Mons and our moon's South Pole-Aitken basin, a vast crater. Map-a-Planet from the U.S. Geological Survey lets you chart the surface features of seven solar system bodies, including Mars, Venus, and four of Jupiter's satellites. You can download maps based on a variety of measurements. For instance, Venus aficionados can choose among seven data sets, such as radar and microwave emissions, captured by the Magellan probe. The Galileo spacecraft snapped the pock-marked surface of Jupiter's giant moon Ganymede, which is larger than Mercury.

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