If all goes to plan, 4-pound (1.8-kg) whirligig will slowly ascend straight up to an altitude of 10 feet (3 meters) above Martian surface, hover in place for 30 ...
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If all goes to plan, 4-pound (1.8-kg) whirligig will slowly ascend straight up to an altitude of 10 feet (3 meters) above Martian surface, hover in place for 30 ...
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