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Unformatted text preview: ago. But atmosphere evaporated so the planet cooled. In 1997 Pathfinder landed In the beginning Venus Earth Mars had thick water vapor and carbon dioxide atmosphere all similar. Mars was too small so it lost its atmosphere. Venus was too hot to ever rain - leaving thick carbon dioxide causing sever greenhouse effect. But on Earth rains came and oceans dissolved carbon dioxide. Planet Distance from Sun Mass Radius Avg Density Mercury .39 AU .055 Earth masses .38 Earth Radii 5430 kg/ m 3 Venus .72 .82 .95 5250 Earth 1 1 1 5517 Mars 1.52 .11 .53 3930...
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