Word: meteor
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Dates: during 1990-1999
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Such resurfacing has undoubtedly taken place in Venus' lowlands: earlier images of the planet showed vast areas that are remarkably free of craters. That would be easy to explain on a planet like Earth, where cratering from meteor strikes is erased by steady erosion. But while there is some evidence of wind erosion on Venus, the best explanation for the lack of cratering is periodic lava flows. Magellan has found direct evidence of such flows, including domelike upwellings and hardened streams of rock trailing down the sides of Venusian peaks. There are also signs of other geologic activity, including dramatic...