Spacecraft engineers at NASA's Jet Propulsion Laboratory (JPL) hope to land the Mars Curiosity rover closer to its target than originally planned, moving the “sky crane” touchdown about 4 mi. nearer the base of the mountain where scientists seek to explore layers of sedimentary rock for evidence that a wetter Mars could have supported life. Pete Theisinger, the Mars Science Laboratory project manager at JPL, says navigation software already uploaded to the spacecraft for the Aug. 6 ...

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