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Apr 29, 1543
Heliocentric Theory
Copernicus reinvented this theory and challanged Church doctrine. -
Milky Way Galaxy Discovery
Galileo uses a telescope for astronomcial purposes, and makes the discovery of the Milky Way Galaxy, four Jovian moons and the moons craters. -
Saturn's Rings
Christain Huygens discovers Saturn's Rings and Titan, the fourth satelite of Saturn. -
"Cassini Division"
Cassini discovers that Saturn's rings are split into two parts, so today they are called the "Cassini Division" -
Uranus
The discovery of Uranus by Herschel -
Asteriod
Piazzi discovers the first asteriod "Ceres" -
Neptune
Johann Galle observes and discovers Neptune. His observations were prompted by mathematical calculations by French astronomer Joseph Leverrier and English astronomer John Couch Adams. -
Stars
The beginning of spectral analysis of stars by Sir William Huggins -
Galaxies
Hubble shows that galaxies exist outside the Milky Way galaxy. -
Pluto
Clyde Tombaugh discovers Pluto.