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LIFE.com: NASA's Greatest Hits

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June 3, 1965: America's First Spacewalk

In the summer of 1965, Gemini's GT-4 takes Edward H. White II into the sky for four days, allowing him to complete the first extra-vehicular activity or "spacewalk" by an American. Pictured: White is seen in space, against Earth's vast blue backdrop. (NASA/Time and Life Pictures/Getty Images/LIFE.com)
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