Commitments to staff space station and return to the moon by 2020 make Martian expedition too daunting a task, says Charlie Bolden
Jul 21, 2009
Irene Klotz
Reuters
http://www.theglobeandmail.com/news/technology/science/status-quo-wont-get-nasa-to-mars-agencys-chief-says/article1226281/
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