our closest planetary negighbour is about the same size as Earth ; now, , it seems the two planets are sisters under the skin as well. After charting the locations of more than 1,600 volcanic structures on the planet, mapped in detail with radar by the magellan orbiter , brown university scientists say the volcanoes are clustered much as earthly ones are, implying that Venus may have a struckture of thin crust over molten rock that is similar to Earth's