-
4540 BCE
Planatary Accretion
After the big bang, the dusts from the big bang collaborates and get bigger with the resources that they need to be a planet. They get much bigger for a long time. -
4500 BCE
Earth's Core Formation
At this time, dusts are almost collaborated as the size of the planet they're going to be. One dig rock crashes with other small rocks and dusts. The big rock joins together with these rocks and dusts. After few time, this stone gets as big as today's Earth. However, it is very hot because of heat made by collision. -
4400 BCE
Formation of the Moon
After the Earth was made, a big rock size of Mars comes to the earth and crashes. At this situation, a small part of the Earth breaks out. This little rock starts to rotate the Earth with the gravity of Earth. This rock is the moon today. After this creation, the Earth gets very hot by the crash. -
3900 BCE
End of Heavy Bombardment
When the Earth got hot after making the moon, Some meteorites including elements and water inside it crashes the Earth. In this part, heavy elements shrinks into the Earth and light elements and water remain on the Earth. -
3900 BCE
Planetary Cooling
The water on the Earth cool the surface and make them to be harden. The heat in the Earth moves to expand, and this movement makes Earth to spin and have magnetic field on the Earth. Also, it breaks up the surface and make these tectonic plates to move. -
3900 BCE
Cooling rate
At the time of planetary cooling, we could find out their cooling speed with analyzing radioactive isotopes. There's a data of radioactive age of isotopes on each planets and Chondrites.
Most of them started to cool at 4400million~4500million BC, but there were differences in the speed of cooling. Chondrites was the fastest(ended in 4400million BC) and Mars was the smallest(140million BC).
