DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Martian volcanic landscape. 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. 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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