Saturn is the most inside rockcore, its diameter is 2 million meters.
土星最里面是岩石核心,其直径有2万千米。
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A titanic impact could have stripped away a portion of its rocky mantle, leaving behind a metallic core whose density is out of proportion with the original ratio of rock to metal.
Computer simulations of this impact show that both of the objects would melt in the impact and the dense core of the impactor would fall as molten rock into the liquefied iron core of Earth.