Voyager 1 passed Pioneer 10 to become the most distant human-made object in space.
Source
NASA's Challenger Space Shuttle was launched from Florida on its maiden voyage.
Two Earth-like planets in one solar system were discovered.
Sputnik 5 is launched by USSR.
NASA's Explorer 49 was launched into Earth's orbit to research long-range radio waves within the Milky Way.
The crew of Skylab 4 returned to Earth.
