(Source: Getty Images)
John Grunsfeld President Obama Hosts Astronomy Night For Students on White House South Lawn
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John Grunsfeld NASA Announces Major Scientific Finding on Nature of Mars
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John Grunsfeld Picture John Grunsfeld Picture John Grunsfeld Picture
Also Appearing:
Michael Meyer, Jim Green 
John Grunsfeld In Focus: NASA's New Horizons Probe Passes Pluto
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Also Appearing:
Alice Bowman, Alan Stern, Dwayne Brown 
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