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140 BCE
Claudius Ptolemy
He discovered grocentric that Earth is the center of the universe. -
1531
Edmond Halley
Having computed the orbit of the famous Halley's Comet(named after him). -
1543
Nicolaus Copernicus
The geocentric model was first proposed by Nicolaus Copernicus in 1543. -
Dec 27, 1571
Johannes Kepler
Johannes Kepler was a German mathematician, astronomer, and astrologer. Kepler is a key figure in the 17th-century scientific revolution. 27 December 1571 -
Galileo Galiei
In 1632, published a book that stated, among other things, that the heliocentric theory of Copernicus was correct. -
William Herschel
Astronomer William Herschel discovered the planet Uranus. -
discovery of the first asteroid
Giuseppe Piazzi discovered the first and largest asteroid, Ceres -
Discovery of the second asteroid
Pallas, minor-planet designation 2 Pallas, is the second asteroid to have been discovered, and is one of the largest asteroids in the Solar System. -
Discovery of the third asteroid
Juno, with minor-planet designation 3 Juno in the Minor Planet Center catalogue system, is an asteroid in the asteroid belt. -
The discovery of the fourth asteroid
Vesta, minor-planet designation 4 Vesta, is one of the largest objects in the asteroid belt, with a mean diameter of 525 kilometres. -
Urbain Le Verrier
Le Verrier was an astronomer who discovered the planet Neptune by using math. -
Clyde Tombaugh
Clyde William Tombaugh was an American astronomer. He discovered Pluto in 1930, the first object to be discovered in what would later be identified as the Kuiper belt. -
Voyager 2
Part of the Voyager program to study the outer Solar System, Voyager 1 launched 16 days after its twin, Voyager 2 -
Voyager 1
Voyager 1 is a space probe launched by NASA on September 5, 1977.
