The surface features of are known only through satellite radar mapping. jupiter mercury venus mars

The surface features of VENUS are only known through satellite radar mapping. Venus is the second planet from the sun and it is blanketed by a thick atmosphere mainly of carbon dioxide and thick clouds of mostly sulfuric acid. The amount of carbon dioxide in the atmosphere is responsible for the high atmospheric pressure experienced on the planet. The Pioneer Venus Orbiter was the craft used to undertake the radar mapping of the Venusian surface.  

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