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168
Claudius Ptolemy
Ptolemy made the geocentric model of the universe. -
1531
Edmond Halley
Halley was the first to calculate the orbit of a comet approaching Earth in 1531, 1607 and 1682 and later named after him. He concluded that these comets were actually the same and predicted they would come again in 1758. -
1532
Nicolaus Copernicus
Polish scientist Nicolaus Copernicus proposed that the planets revolved around the sun. -
Johannes Kepler
Kepler not only adamantly defended the idea that planets orbit the sun, but he also revealed that their paths were not perfect circles. -
Galileo Galilei
Galileo Galilei improved telescopes and that led him to discover the moons of Jupiter and the rings of saturn. -
William Herschel
He discovered the planet Uranus. -
Discovery of the first four asteroids
Ceres, 2 Pallas, 3 Juno and 4 Vesta -
Urbain Le Verrier
Predicted by mathematical means the existence of the planet Neptune. -
Clyde Tombaugh
discovered Pluto -
Voyagers 1 and 2
The Voyagers 1 and 2 were to conduct close-up studies of Jupiter and Saturn, Saturn's rings, and the larger moons of the two planets.
