Voyager 1 passed Pioneer 10 to become the most distant human-made object in space.
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Halley's Comet was last seen from Earth. It only orbits the Earth once every 75 to 76 years.
Space Shuttle Discovery completed its last-ever mission and made its final landing onto Kennedy's runway at 11:57 am EST.
NASA's Columbia Space Shuttle launched from the Kennedy Space Center on mission STS-32.
Alvan Graham Clark discovered the white dwarf star Sirius B.
Venera 7 launched by the Soviet Union.
