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The first reusable spacecraft(space shuttle) was Columbia.
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The first in-space sattelite repair was done by Challenger.
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The space shuttle Challenger blew up due to a faulty O-ring in the rocket boosters. NASA shut down all shuttle flights.
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Mir was the first space station to have a crew on it.
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NASA re-designed the rocket boosters and communacation problems that caused the Challenger tragedy. They returned back to flight two years after the disaster.
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The first large space telescope(Hubble) is launched into space.
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The first part of the International Space Station(I.S.S.) was sent into space. This is the first space station for more that one country.
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The N.E.A.R. rover landed on the asteroid Eros.
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The first tourist in space paid $20 milliion to go to the I.S.S. The U.S. would not accept his offer but the Russians later did. He got limited access to the I.S.S.
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The Chinese launched their first manned spaceflight.