DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Future Mars exploration, computer artwork. Martian explorer walking in a spacesuit on the surface of Mars near tower-like buildings. The lower parts of the buildings are habitation spheres in which the explorers live. Humans would require protective suits and sealed buildings if they were to live on Mars. This is because the thin atmosphere is nearly all carbon dioxide, and the freezing surface temperature ranges from minus 89 to minus 31 degrees Celsius. Mars has no surface water and is a rocky desert world. It has a gravity that is about a third of that of Earth.
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