CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Mars base. Computer artwork of astronauts at a base on Mars. They are inside a large sealed dome that has trees and other plants inside it. These could be used to recycle carbon dioxide to oxygen, as well as providing food. Humans will require protective suits and sealed buildings when living on Mars. This is because the thin atmosphere is nearly all carbon dioxide, and the freezing surface temperature ranges from -89 to -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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