Radar helps scientists see beneath Venus' cloud cover

March 10, 2015 9:39 PM

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Venus is sometimes called Earth's "sister planet," because of the two planets' similar size, mass, composition and distance from the sun. But their makeup is quite different.

The small, hot planet -- the second planet from the sun -- has the densest atmosphere of the solar system's four terrestrial planets, made up of 96 percent carbon dioxide. Additionally, the planet is encapsulated in shiny clouds of sulfuric acid.

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