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4600 BCE
Birth of Sun
In the beginning, the solar system started as a gas cloud that moved around the galaxy. At some point, a star nearby exploded and sent a shock wave through it. This caused the gas cloud to gravitationally collapse, forming the sun and a protoplanetary disk around it.
Source: Video #1 -
4510 BCE
Formation of Moon
Theia, a planetoid the size of Mars, crashed into the Earth and knocked some debris off of it. The debris orbited the earth and eventually coalesced into the moon.
Source: Video #4 -
4500 BCE
Primary Accretion Stage
During the primary accretion stage, the dust was colliding into each other and creating little clumps.
Source: Video #1 -
4400 BCE
Planetary Cooling
The force of the moon-forming impact left Earth a churning hot magma blob. But as the planet cooled, lava became rock and liquid water started to condense, forming Earth's first ocean. Source: Photo Timeline -
3800 BCE
End of Heavy Bombardment
A lot of violence occurred that Jupiter and Saturn migrated their ways towards the inner planets, sent rocks raining down on the inner planets, and eventually migrated back out. During that stage, comets carrying water hit the earth, explaining the existence of water on earth.
Source: Video #1 -
3500 BCE
Generation of Oxygen
The first whiffs of oxygen — from the evolution of photosynthesis — emerged in rocks about 3.5 billion years ago.
Source: Photo Timeline -
1500 BCE
Earth's Core Formation
Radiations from the recent supernova and all of the collisions caused Earth to become so hot that the rock and metal began melting. Heavier materials sank to the bottom and lighter elements rose to the top. This transformation created the earth’s core.
Source: Reading #1 & Video #3
