The nascent solar system thus contracted and flattened into a disk. Formation of earth dates occurred 4.6 billion ago. The dense cloud, compressed due to gravity, grew immensely hot and heavy in the center. This became the Sun. The matter on the outskirts of this nebula was pushed outward into space due to the force of solar winds. This matter aggregated through gravity and coalesced into what are called proto-planets and potential moons. This is how Earth is formed because the third proto-planet from the Sun was Earth.
