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The Soviet satellite "Sputnik 1" is the first object sent into spave and to successfully orbit the Earth.
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The first United States satellite to orbit the Earth - Explorer 1 - is launched.
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NASA (National Aeronautics and Space Administation) is formed.
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Russian citizen, Yuri Gagarin, is the first human in space. (he orbits the Earth.)
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Alan Shepard is the first United States citizen to go into space.
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John Glenn is the first United Sates citizen to orbit the Earth.
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Apollo 11 crew member Neil Armstrong is the first man to walk on the moon. HIs fellow Apollo astronaut crew member Edwin "Buzz" Aldrin is right behind him, becoming the second man to walk on the moon.
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The first American space shuttle is launched. This marks the us of the first "re-usable" spave craft.
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The space shuttle Challanger explodes shortly after take-off.
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Human habitation in the International Space Station begins. (I couldn't find the day and month. I could only find the year.)
