Companies selected for six-month studies by NASA’s proposed Asteroid Redirect Mission (ARM) project will evaluate solar electric propulsion (SEP) and deep-space navigation sensors the agency hopes can be used again and again as human explorers move out toward the surface of Mars. Among studies the agency will fund with a total of $4.9 million are four directed at SEP, three of them specifically derived from the relatively low-power systems used by commercial communications satellites ...

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