One of the theories of why Mercury has a large metallic core is an impact theory like the explanation of the formation of the Earth’s moon. This theory involves a large object like an asteroid striking Mercury and blowing away a great portion of the crust and mantel. This would mean that Mercury would have lost a great deal of its lower density elements due to many of them being removed by the impact. After the impact was over, much of the denser material should have remained to form the core. Over time Mercury collected some of the less dense material through its orbit and formed a thin mantel and crust. This would leave the planet with a deficiency of less dense rock to help form its crust.

Theories should pertain to reality to an extent,