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Another claim is that space exploration is a necessity to mankind and that staying on Earth will lead to extinction. Some of the reasons are lack of natural resources, comets, nuclear war, and worldwide epidemic.
Credit: Mars One/Bryan Versteeg. Editor's Note: In this weekly series, SPACE.com explores how technology drives space exploration and discovery. If humanity hopes to establish a lasting presence on Mars, it will have to learn to live off the land. Ambitious exploration efforts have always aimed for self-sufficiency, but the need is especially acute when the new terrain being traversed is another planet.