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Sputnik 1
sputnik 1 was launch by Soviet Union -
first human in space
Yuri A. Gagarin became fist man in space -
John Glenn orbits earth
John Glenn became first man to orbit Earth -
project Gemini
the second step toward reaching the moon -
Apollo
Neil Armstrong becomes first man to walk on moon -
Pioneer 10
one of the first space probes launched into space