Venus Lecture (10-13-08) - Astronomy 100 Lecture Notes from...

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Astronomy 100 Lecture Notes from October 13, 2008 VENUS Venus: “Earth’s Evil Twin” Venus is the closest in size to the Earth. Hot! 470 °C (925 °F) Spins very slowly and backward (west to east as opposed to the rest of the planets which is east to west) Extremely thick atmosphere – 100 times thicker than that of the Earth Always covered in thick clouds made of concentrated sulfuric acid. Can’t see the surface in visible light. “Seeing” Venus Venus’ clouds hide its surface from studying visible light. To see surface, use radio waves. Magellan spacecraft orbited Venus and mapped its’ surface with radar. o Found valleys, mountains, volcanoes, rift valleys Impact Craters on Venus Venus has about 1,000 craters. o No trace of heavy bombardment o No small craters o Venus’ craters tend to be in clusters Crater number indicates the surface is no more than 750 million years old. o
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Venus Lecture (10-13-08) - Astronomy 100 Lecture Notes from...

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