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The terrestrial planets are four small, dense rocky planets that orbit close to the sun. These planets mercury , Venus, Earth, and Mars. Mercury is the planet that we know the least. Until NASA mariner 10 spacecraft flew by mercury in 1974, it was seen as a blotchy

Earth is the only planet that scientist know that supports life. Earths atmosphere contains the oxygen that animals and humans need to breath to live. Venus is often called “Earths twin”.