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If the Strategic Defense Initiative
was problematical for the
Reagan administration, other efforts in space were more
promising. In 1981 the U.S. launched the space shuttle
Columbia
-- the first reusable manned spacecraft. Between
1981 and 1985,
the shuttle demonstrated extraordinary versatility, with
astronauts conducting experiments, taking photographs, and
launching, retrieving and repairing satellites while in orbit.
But in January 1986, tragedy
struck: the space shuttle
Challenger
exploded 73 seconds after takeoff, instantly killing six
astronauts and a schoolteacher who was to have been the first
ordinary citizen in space. Space shuttle missions were postponed
indefinitely while
NASA set out to redesign the shuttle for
safety. By the time the United States successfully launched the
shuttle
Discovery in late 1988, there had been over 300 changes
in the shuttle's launch systems and computer software.
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