<p>From left, Commander Chris Ferguson, pilot Doug Hurley, mission specialist Sandy Magnus and mission specialist Rex Walheim answer questions during the STS-138 crew media briefing at the Johnson Space Center on June 30 in Houston. The crew was part of the final space shuttle mission in July.</p>
September 18, 2011
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September 18, 2011 9 p.m.
Daunting space task - send astronauts to asteroid
NASA sets goal of 15 years or less
HOUSTON- With the space shuttle now history, NASA's next great mission is so audacious, the agency's best minds are wrestling with how to pull it off: Send astronauts to an asteroid in less than 15 years.