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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.
03.28.08. 1  Editor's Note: This is the 29th in a series of essays on exploration by NASA's Chief Historian, Steven J. Dick. It may well be argued that NASA has become the world's premier agent for exploration, carrying on in the new ocean of outer space a long tradition of expanding the physical and mental boundaries of humanity.