Earth's Formation

By Guo.Guo
  • 14 BCE

    Big Bang

    (all BC are BYA)
    Created the building block of matter.
  • Earth Formed
    4 BCE

    Earth Formed

    4.6BYA
    Formed from stardust and through comets colliding into each others. Different comets with different materials collied, this formed rare and heavy elements on Earth. The surface is completely covered by molten rocks.Has lack of water and atmosphere.
  • 4 BCE

    Moon Formed

    4.5BYA
  • Period: 4 BCE to 3 BCE

    Planetary cooling

    4.5-3.8BYA
    The surface of Earth started to cool down
  • Heavy Bombardment
    3 BCE

    Heavy Bombardment

    4-3.8BYA
    A period of time when planets in the inner solar system was being bombarded by heavy meteoroid on a regular basis. The asteroids are likely from the asteroid belt, where the main components are ice. In other words Earth's water likely came from the asteroids from the Heavy Bombardment time.