-
400 BCE
Aristarchus of Samos
The eart revolved around the sun -
200 BCE
Hipparchus
Stars clasified acoording to their brightness. -
200
Ptolemy
Geocentric astronomic model. Sun, moon, and the five known planets (Venus, Mercury, Mars, Jupiter, and Saturn) revolved around the Earth. -
Sep 12, 1543
Copernicus
Heliocentric model. Planets revovled around the sun. -
Tycho Barhe
He carried out very detailed observation of the planets. -
Kepler
He deduced his famous planetary laws following Brahe's observations. -
Galileo Galilei
He used the telescope for the first time, it was the birth of modern astronomy. -
Isaac Newton
Built the first telescope usin mirrors instead of lenses. -
The Principles of Natural Philosophy
The laws governing the movement of planets are explained by Isaac Newton. -
Edmund Halley
Explained Newton's laws and predicted the return of a comet in 1758 -
W. Herschel
Discovered Uranus -
Astrophysics.
Created thanks to the spectroscope, an apparatus wich allows us to identify substances in the stars. -
F. W. Bessel
Measured the distance from a star using geometry. This confirmed Copernicus's theory. -
Adams, Galle and Leverrier.
Discovery of Neptune. -
E. P. Hubble
Proved that some of the nebulas seen in sky are independent galaxies. He discovered galaxies moved away from each other. -
C. Tombaugh
Discovered pluto. -
Neil A. Armstrong
First man walking on the moon. -
Extrasolar Planets
Discovery -
Michael E. Brown
Discovery of the largest Kuiper Belt object (KBO) ever.
