MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Image comparing the size of Earth (right) with the planet Venus. Venus is the second planet from the Sun, with an average distance from it of 0.72 times the Earth-Sun distance. It is also the hottest planet (despite being further from the Sun than Mercury) because its thick atmosphere of carbon dioxide has created a runaway greenhouse effect. Lead, tin and zinc would all melt on Venus. With a diameter of 95% that of the Earth, Venus is the Solar System's sixth largest planet.
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