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John M. Grunsfeld
December 22, 2015
NASA calls off next Mars mission; no time to fix leaky seal
NASA is calling off its next mission to Mars because there isn't enough time to fix a leaky seal on a key science instrument.
September 28, 2015
Life on Mars? NASA says planet appears to have flowing water
Mars appears to have flowing rivulets of water, at least in the summer, scientists reported Monday in a finding that boosts ...