DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Astronauts on Mars. Artwork of two astronauts on Mars standing on the edge of a crater. The arm of one astronaut is visible far right, and the hand of the other astronaut is visible bottom left. Their shadows are visible in the centre. 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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