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The unmanned spaceship, which could one day take astronauts to the Red Planet, circled Earth twice in a test mission of its basic systems that lasted just under 4 1/2 hours.
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A U.S. probe cost $637 million to get to Mars; an Indian mission cost about a tenth as much. There are at least a few reasons why, both teams agree — starting with the differing shapes of each orbit.
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Human settlement on Mars is a long way away, but two St. Louis-area residents are on the short list to be among the first settlers of the Red Planet.The…