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Period: 100 to
The Timeline of models
The timeline contains scientists who had theories and discoveries that occurred in history. -
140
140: Claudius Ptolemy
Claudius Ptolemy was the one who did the geocentric model and viewed it as that the Earth is in the middle of the Solar System and everything inside the solar system, including the Sun, orbits the Earth. -
1543
1543: Nicolaus Copernicus
Nicolaus Copernicus developed this theory and proposes that planets all orbit the Sun that is motionless and can't move around. -
1609 - 1619: Joannes Kepler
Joannes Kepler discovered three major laws of planetary motions and solved Mar's mysterious orbit that puzzled people like Copernicus. -
1610: Galileo Galilei
Galileo Galilei has made improvements into Hans Lippershey's telescope and in January 7th 1610, he discovered Jupiter's 4 largest moons. -
1682: Edmond Halley
Edmond Halley discovers that comets orbit the Sun in a predictable way. Halley thinks that the comet sightings in 1531, 1607 and 1682 are made by one comet, and comes every 76 years. -
1781: William Herschel
William Herschel discovered Uranus while using his new telescope he built himself. He then discovered Uranus's two moons. -
1801: Discovery of the first 4 Asteroids
The first 4 asteroids were found within a timespan of a few years. The first asteroid was Ceres, discovered in 1 January, 1801 by Giuseppe Piazzi. The second asteroid was Pallas, discovered in 28 March, 1802 by Wilhelm Olbers. The third asteroid was Juno, discovered in 1 September, 1804 by Karl Harding. The fourth asteroid was Vesta, discovered in 29 March, 1807 by Wilhelm Olbers, again. -
1811: Urbain Le Verrier
Urbain Jean Joseph Le Verrier was a French mathematician who specialized in celestial mechanics and is best known for predicting the existence and position of Neptune using only mathematics. -
1930: Clyde Tombaugh
Clyde Tombaugh discovered Pluto in 1930, which was the first object to be later classified as the kuiper belt. He also discovered some asteroids. -
1977: Voyagers 1 and 2
Voyager 1 has launched 16 days after its twin, Voyager 2. Voyager 1 was the first probe to reach the outside of the Solar System.