-
400 BCE
Aristocrathus
He suggested that the Earth revloved around the Sun -
200 BCE
Hiparcus
Classified stars according to their appearent brightness. -
200
Ptolemy
Suggested a Geocentric astronomic model
(all the known celestial bodies) -
Sep 12, 1543
Copernicus
Published the heliocentric model according to which the planets revolved Sun -
Tyco Brahe
Made a very detailed observation of the planets.
And Kepler deduced its planetary laws following Brahe´s observation. -
The birth of modern astronomy
Galileo he used a telescope to observe night sky.
This was the birth of the modern astronomy -
Isaac Newton
He built the first telescope using mirrors instead of lens. -
Newton´s book
He published his book "The principles of natural philosophy", in which he explained the laws governing the movments of planets -
Edmund Halley
He explained Newton´s laws and predicted the return of the comet in 1758 -
W. Herschel
W. Herschel discovered Uranus -
Ceress and Pallas
he gap between the planets Mars and Jupiter disclosed by the Titius–Bode law was filled by the discovery of the asteroids Ceres and Pallas with many more following. -
Decomposing light
In the 19th century it was discovered that, when decomposing the light from the Sun, a multitude of spectral lines can be observed.. It was proved that the chemical elements found in the Sun (chiefly hydrogen and helium) were also found on Earth. -
A new Eye
In the 20th century, scientists began discovering forms of light which were invisible to the eye: X-Rays, gamma rays, radio waves, microwaves, ultraviolet radiation, and infrared radiation. -
Spectrosphy
During the 20th century spectroscopy (the study of these lines) advanced, -
Edwin Hubble
The existence of other galaxies, one of the matters of the great debate, was settled by Edwin Hubble, who identified the Andromeda nebula as a different galaxy, and many others at large distances and receding, moving away from our galaxy.
