The Expanding universe

By lafarrell02
  • 100 BCE

    Geocentric System

    Ptolemy believed that the earth was the center of the universe.
  • 1543

    Heliocentric System

    Copernicus believed that the sun was at the center of the universe, motionless, with Earth and the other planets orbiting around the sun.

  • Explained lack of parallax

    Galileo was trying to prove that the sun was in a different position every 6 months

  • Law of Gravitation

    ALL objects attract each other with a force of gravitational attraction.

  • The Shape Of the Galazy

    Herschel built large telescope's in order to discover that we are located in a disk of stars

  • Sun's Place in Galaxy

    Shapley's calculation puts the sun at 50,000 light years away from the sun in the direction of Sagittarius.

  • Other galaxies and Hubble law

    The distant galaxies we see in all directions are moving away from the Earth, as evidenced by their red shifts. Hubble's law describes this expansion.

  • General Relativity

    Einstein's theory holds that space itself is curved near a massive object and that the curvature causes the acceleration that previously had been attributed to the force of gravity.