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Accumulation of particles into a massive object due to the gravitation attracting more matter. They will eventually form planets in the solar system.
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It is second to the last layer of the earth and was created 25 years after the formation of the earth.
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planetary cooling formed the planet into a molten planet and helped formed the planet into a sphere.
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During this time, failed planets and smaller asteroids slammed into larger worlds and scarred their surface.
