DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Martian rock. Artwork of a Martian rock being held in an astronaut's hand. The Martian atmosphere is mostly carbon dioxide and surface temperatures are well below freezing. Martian astronauts will have to breathe their own air supply and wear heated spacesuits on the surface of Mars. Mars is a rocky desert world and has no surface water. The gravity is about one third of that on Earth.
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