Need something to do over Thanksgiving? Protect astronauts! Join NASA's #radshield challenge. http://t.co/BnZVJrWzhw #LearnNASA
— Orion Spacecraft (@NASA_Orion) November 25, 2013
Need something to do over Thanksgiving? Protect astronauts! Join NASA's #radshield challenge. http://t.co/BnZVJrWzhw #LearnNASA
— Orion Spacecraft (@NASA_Orion) November 25, 2013
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