Commemorating the space agency's 50th anniversary, follow John Glenn's Mercury mission to orbit the earth, Neil Armstrong's first historic steps on the moon, unprecedented spacewalks to repair the Hubble stories, and more!
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Commemorating the space agency's 50th anniversary, follow John Glenn's Mercury mission to orbit the earth, Neil Armstrong's first historic steps on the moon, unprecedented spacewalks to repair the Hubble stories, and more!
