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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.
The Vision for Space Exploration opens the door for NASA to find out. Researchers on Earth are using several experiments aboard the international space station to study health and safety issues. Space travelers living on Mars for extended periods will need to grow plants, which provide food and generate oxygen.