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Clyde Tombaugh discovers Pluto
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Laika (a Soviet space dog) becomes the first animal to orbit the Earth – as well as the first animal to die in orbit
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Neil Armstrong becomes the first human to set foot on the moon
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Sally K. Ride is the first U.S. woman to travel in space, on Challenger
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The Space Shuttle Challenger, carrying Christa McAuliffe (the first teacher to fly in space) lifts off and seventy three seconds into the mission, the Challenger explodes, killing the entire crew
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The Edwin P. Hubble Space Telescope is launched
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Discovery of the Kuiper Belt
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Construction begins on the International Space Station
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The Space Shuttle Columbia disintegrates over Texas and Louisiana during re-entry, resulting in the death of all seven crew members
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The rover Spirit lands on Mars
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The rover Opportunity lands on Mars
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Pluto and 4 other objects identified as dwarf planets