An Astronaut Explores NASA's Scientific Frontiers
News > Space

Friday, April 27, 2012 at 1:47 PM
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He's flown the space shuttle five times, and performed eight spacewalks to service the Hubble telescope. Now astronaut and astrophysicist John Grunsfeld heads up NASA's Science Mission Directorate, where he manages scientific investigations on the home planet--and beyond.

   
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