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Claudius Ptolemy
He believed that the Earth was the center of the Universe. The word for earth in Greek is geo, so we call this idea a "geocentric" theory. -
Feb 19, 1473
Nicolaus Copernicus
One of his major events was his proposition of the idea that the Earth and other planets revolve around the sun; or the Heliocentric Theory of the universe. -
Feb 15, 1564
Galileo Galilei
Galileo Galilei proposed the theory that the Earth was round instead of being flat. Some of his other major discoveries were, the discoveries of the four giant moons of Jupiter and the rings of Saturn. -
Dec 27, 1571
Johannes Kepler
One of his major events was his discovery of the 3 main laws of planetary motion; 1) Planets orbit the sun in an elliptical shape
2)The time necessary to traverse any arc of a planetary orbit is proportional to the area of the sector between the central body and that arc. 3) There is an exact relationship between the squares of the planets’ periodic times and the cubes of the radii of their orbits (the “harmonic law”). -
Edmond Halley
Edmond Halley was majorly known for discovering that comets orbit the sun in a predictable way. He reasoned that comet sightings in 1531, 1607, and 1682 were made by one single comet returning every 76 years. -
William Herschel
He discovered Uranus, he discovered it while searching for a double star. He, therefore, decided to name it George, after George -
Discovery of the first four asteroids
The first four discovered asteroids are Ceres, Pallas, Juno, and Vesta. -
Urbain Le Verrier
Urbain Le Verrier was a teacher of astronomy at the Ecole Polytechnic Paris. Le Verrier studied the planets Mercury and Uranus. He discovered the planet Neptune by using math. -
Clyde Tombaugh
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Voyagers 1 and 2
Between them, Voyager 1 and 2 explored all the giant planets of our outer solar system, Jupiter, Saturn, Uranus and Neptune; 48 of their moons; and the unique system of rings and magnetic fields those planets possess.
