Gliese 229B became the first brown dwarf to be seen and identified by astronomers.
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Scientists discovered the most distant supermassive black hole.
The Outer Space Treaty was signed to prevent the use of nuclear weapons being utilized in space.
Apollo 11 landed on the Moon with astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins.
William Herschel discovered the first binary star.
Two newly discovered moons orbiting Pluto were named Nix and Hydra.
