Astronomer Richard Walker discovered Saturn’s moon, Epimetheus.
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American astronomer Clyde Tombaugh discovered Pluto.
Osiris became the first discovered exoplanet with an atmosphere.
Alvan Graham Clark discovered the white dwarf star Sirius B.
Astronomer Edwin Hubble formally announced the existence of other galactic systems at a meeting of the American Astronomical Society.
Carolyn & Eugene Shoemaker and David Levy discovered the Shoemaker-Levy 9 comet.
