-
He suggested that the Earth revloved around the Sun
-
Classified stars according to their appearent brightness.
-
Suggested a Geocentric astronomic model
(all the known celestial bodies) -
Published the heliocentric model according to which the planets revolved Sun
-
Made a very detailed observation of the planets.
And Kepler deduced its planetary laws following Brahe´s observation. -
Galileo he used a telescope to observe night sky.
This was the birth of the modern astronomy -
He built the first telescope using mirrors instead of lens.
-
He published his book "The principles of natural philosophy", in which he explained the laws governing the movments of planets
-
He explained Newton´s laws and predicted the return of the comet in 1758
-
W. Herschel discovered Uranus
-
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.
-
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.
-
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.
-
During the 20th century spectroscopy (the study of these lines) advanced,
-
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.
