Earth.

Planetary Accretion

4567 BCE

Celestial bodies were created through accretion, this period lasted approximately 100 million years. Large magma bodies were formed and they eventually allowed for metallic cores to be formed.

Formation of the Moon

4500 BCE

Earth had collided with another celestial body and sent pieces of the crust into space. Gravity merged these pieces together and formed the moon. There are a multitude of different theories but this is one of the theories of greatest credbillity.

Planetary Cooling

4000 BCE

Asteroid, meteoroids, and Comets formed the shape of the earth. The planet became molten in sphere shape and magma eventually formed the outer core of the earth.

Heavy Bombardment

3800 BCE

An abnormally large amount of Asteroids and such collided with planets in the early solar system. This theory is not "confirmed" and there are theories questioning the existence of this event.

Core Formation

1500 BCE

Molten iron around the core of the earth cooled down and froze into the present core. High pressure and High temperature helped create the shape of the core.