From the article:
"A near-Earth asteroid is a great intermediate destination that would allow NASA to check out the launch systems and crew vehicles, as well as set procedures," Huntress [former NASA associate administrator for science] told a group of about 100 people at the U.S. Space & Rocket Center. "It would be a six-month, or even a year mission, but that's quick compared to a three-year or longer human voyage to Mars...In the end it would give NASA confidence to go to another planet."
"Practice run before Mars suggested"
08 December 2007
Huntsville Times
Shelby G. Spires
Link: Article
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