Sentences with phrase «short lunar surface»
A key hurdle for any lengthy human mission on the surface of a planet or moon, as opposed to NASA's six short lunar surface visits from 1969 to 1972, is possessing a power source strong enough to meet the various energy needs to sustain a base but small and light enough to allow for transport through space.
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Eventually two competing explanations emerged: Either some outside force helped stir the lunar interior and drove the dynamo, or the magnetized rocks were created by short - lived fields produced during violent asteroid impacts on the lunar surface (SN: 12/17/11, p. 17).