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The Soviet satellite "Sputnik 1" is the first object sent into space and to successfully orbit the Earth.
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The first "Earthling", a Soviet dog named Laika, is successfully sent into space.
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The first Untied States satellite to orbit the Earth, "Explorer 1" is launched.
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NASA (National Aeronautics and Space Administration) is formed.
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Soviet cosmonaut Yuri Gagarin becomes the first person in space. He orbits the Earth.
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Alan Shepard becomes the first U.S. citizen in space.
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Astrronaunt John Glenn becomes the first U.S. 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 crew member Edwin "Buzz" Aldrin is right behind him, making him the second man to walk on the moon.
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Voyager II, the first space probe to fly by the four gas giant planets - Jupiter, Sautrn, Uranus, and Neptune - is launched.
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The first American space shuttle is launched. It is the first "re-usable" space craft in history.
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The space shuttle Challenger explodes shortly after take-off, killing all of its crew members including the first teacher in space, Christa McAuliffe.
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The Hubble Space Telescope is launched into orbit around the Earth.
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The un-manned American space probe "Pathfinder" lands on Mars and begins its sucessful exploration of the planet.
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Human habitation in the International Space Station begins.
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The space shuttle Columbia explodes upon re-entry into Earth's atmosphere.
