Timeline Of Space Discovery

By Catherine Nguyen
  • 384 BCE

    Aristotle

    Aristotle was a Ancient Greek philosopher that suggested that the Earth was at the center of the solar system.
  • 200 BCE

    Aristarchus

    Aristarchus suggested that the Sun was at the center of the solar system, not the Earth.
  • 150 BCE

    Ptolemy

    Ptolemy was Ancient Greek philosopher that suggested the idea of how the planets moved, in epicycles.
  • 1543

    Nicolas Copernicus

    Copernicus suggested the idea of the sun being in the center of the solar system rather then the Earth being at the center. He was also the only scientist that was able to order the planets correctly.

  • Galileo Galileo

    Galileo was an Italian scientist improved the telescope and managed to found out new evidences such as the moons on Jupiter, sunspots and the way we see Venus.

  • Johannes Kepler

    Johannes Kepler was a German scientist who prospered the 3 laws that explains the movement of the planets. One of these laws was that the orbits of the planets are not perfect circles and are more like ellipses and another one of these laws was that the planets do not move at the same speed.

  • Sir Isaac Newton

    Isaac Newton was an English scientist was the one who made the Universal Theory for Gravity. This theory proved Johannes Kepler's ideas correct.

  • William Herschel

    William Herschel was an English scientist who accidentally discovered Uranus.

  • Edwin Powell Hubble

    Edwin Hubble was the one who suggested that our Universe is expanding and this lead scientist to create the idea of the 'BIG BANG" theory.