It took about 200 million years for terrestrial planets (including moons) to come to rest on a path of orbit and begin forming a crust layer. The formation began abrubtly upon the birth of the sun out of the collapse of an immense cloud of hydrogen gas and stellar dust. Given the age of our solar system and the unfathomable timeline that is the universe, 200 million years is very quick for the physics of our solar system to come to rest.
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