Earth's Timeline

By Celine.Chiu
  • 46 BCE

    Planetary Accretion

    Because of gravity, 4 billion 600 million years ago, some particles began to accumulate a larger object, the earth.
  • 45 BCE

    Formation of the moon

    The moon was formed because 4 billion 500 million years ago, a Mars sized planet collided with the earth, and some of the remaining fragments gathered together.
  • Period: 45 BCE to 40 BCE

    Planetary cooling

    450 million to 4 billion years ago, the so-called cooling of the planet was that the heat in the earth began to slow down as time went on.
  • 38 BCE

    End of Heavy Bombordment

    The so-called "late heavy bombardment" is that many comets and asteroids hit the earth 4 to 3 billion 800 million years ago.
  • Period: 15 BCE to 10 BCE

    Core Formation

    The core of the molten iron in the middle of the earth is 150 million to 1 billion years ago.