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Mercury was formed as with all planets in our solar system by accretion.

As the proto planets orbited the Sun, asteroids and other stellar stuff were attracted by the now growing mass of Mercury, adding to it's mass and thus it's gravity. It drew more and more interstellar material until there was little left to absorb.

However, another proto planet about the same size as Mercury was in the same orbit as Mercury and they collided. This "merger" ejected the lighter elements out into the Solar System, whilst the heavier elements combined, giving Mercury is current massive iron core.

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10y ago

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