Gliese 229B became the first brown dwarf to be seen and identified by astronomers.
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Amateur astronomer Gennady Borisov discovered a strange comet in another star system.
Dutch astronomer Johannes Fabricius discovered sunspots.
A chimpanzee named Ham became the first primate to go to space aboard the US MR-2 spacecraft.
The New York Times published Edwin Hubble's discovery that the Andromeda 'nebula' is actually a galaxy.
American astronomer Clyde Tombaugh discovered Pluto.
