-
It was 13 to 20 billion years ago. This theory tries to explain the formation of the universe. It says that in this time, all matter was compacted into a very small ball with infinite density and intense heat, then it exploded and all matter was formed.
-
It is the model in which the Earth and planets revolve around the sun, making it the center of the solar system, it was developed by Nicolas Copernicus.
-
Galileo Galilei improved the telescope: design of these early refracting telescopes consisted of a convex objective lens and a concave eyepiece.
-
Christian Huygens discovers Saturn´s rings
-
Newton built the first reflecting telescope
-
Herschel discovers a new planet, Uranus.
-
Johann Galle discovers Neptune.
-
Albert Einstein makes the Theory of Relativity.
-
Hubble discovers galaxies outside the Milky Way
-
Edwin Hubble concluded that galaxies are drifting apart: this is important observational evidence consistent with the hypothesis of an expanding universe.
-
Clyde Tombaugh discovers Pluto.
-
Sputnik is the first object or artificial satellite to orbit the Earth.
-
Yuri Gagarin becomes the first man in space.
-
First people on the moon: Armstrong and Aldrin walk on the moon.
-
New evidence proves the existence of water on Mars
