NASA's reworked Mars exploration plan calls for a sample return mission no earlier than 2011 or 2014, slipping an attempt to bring back rocks and other material from the red planet once again. But in unveiling its new plan last week, the U.S. space agency emphasized the program is now more resilient and benefits from the hard lessons it learned in the wake of the failures of two missions in a row in 1999. ``We are going to proceed with intense curiosity, coupled with humility and ...
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