Inventor Eric Knight has proposed a thought experiment that calls for two space shuttles to fly to Mars. Here, space shuttle Endeavour stands poised for a March 2008 flight. Credit: collectSPACE.com
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Inventor Eric Knight has proposed a thought experiment that calls for two space shuttles to fly to Mars. Here, space shuttle Endeavour stands poised for a March 2008 flight. Credit: collectSPACE.com |
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