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4.6 billion years ago there was a solar nebula and cloud of dust which was affected by gravity. The rocks joint together in the middle to form the sun.
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The core was formed along with the cloud of dust that created the sun.
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About 4.5 billion years ago, a massive collision happened , a Meteorite that was the size of Mars formed the moon
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Around 4.5 Million to 3.5 billion years ago planetary cooling formed molten planets. Clumps of asteroids,meteors,and comets helped form the planet into a sphere.
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About 4 to 3.8 billion years ago comet and asteroid bombardments hit planets creating craters
