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100
Claudius Ptolemy
Cladius Ptolemy proposed the geocentric model of the Universe -
Jan 1, 1543
Nicolaus Copernicus
Nicolaus Copernicus proposed the heliocentric model of the solar system. -
Johannes Kelper
Made the three laws of planetary motion -
Galileo Galilei
He improved the telescope and discovered that Saturn had rings. -
Edmund Halley
Discovered Halley's Comet -
William Herschel
Credited as the founder of sidereal astronomy -
Urbain le Verrier
Predicted the position of Neptune with only maths -
Clyde Tombaugh
Discovered Pluto -
Voyager 1
Studied the outer Solar System -
Voyager 2
Studied Uranus and Neptune, as well as the outer Solar System
