DAVID A. HARDY, FUTURES: 50 YEARS IN SPACE / SCIENCE PHOTO LIBRARY DAVID A. HARDY, FUTURES: 50 YEARS IN SPACE / SCIENCE PHOTO LIBRARY
Explorers on Mars. Artwork of two explorers and their rover on the surface of Mars. The rover has two arms to facilitate the collection of heavy samples. Humans require protective suits and sealed vehicles to explore 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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