The major events in Astronomy

By Anna03
  • 13 BCE

    Big Bang

    Big Bang
    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.
  • Sep 13, 1543

    Heliocentric model

    Heliocentric model
    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.

  • Telescope

    Telescope
    Galileo Galilei improved the telescope: design of these early refracting telescopes consisted of a convex objective lens and a concave eyepiece.

  • Saturn´s rings

    Saturn´s rings
    Christian Huygens discovers Saturn´s rings

  • Reflecting telescope

    Reflecting telescope
    Newton built the first reflecting telescope

  • Uranus

    Uranus
    Herschel discovers a new planet, Uranus.

  • Neptune

    Neptune
    Johann Galle discovers Neptune.

  • Relativity

    Relativity
    Albert Einstein makes the Theory of Relativity.

  • Other galaxies

    Other galaxies
    Hubble discovers galaxies outside the Milky Way

  • Drifting apart!

    Drifting apart!
    Edwin Hubble concluded that galaxies are drifting apart: this is important observational evidence consistent with the hypothesis of an expanding universe.

  • Pluto

    Pluto
    Clyde Tombaugh discovers Pluto.

  • Sputnik

    Sputnik
    Sputnik is the first object or artificial satellite to orbit the Earth.

  • First one

    First one
    Yuri Gagarin becomes the first man in space.

  • The moon!

    The moon!
    First people on the moon: Armstrong and Aldrin walk on the moon.

  • Water

    Water
    New evidence proves the existence of water on Mars