DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Martian landscape. Artwork of a typical Martian landscape with a boulder in the foreground and Sun in the sky. Mars is a rocky desert world with no surface water. The orange colour of the rocks is due to a high content of iron oxides. Rocks such as the one in the image are thought to have been deposited by ancient water floods. The Martian atmosphere, less dense than Earth's, is mostly carbon dioxide. Surface temperatures are well below freezing. The gravity is about one third of that on Earth.
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