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Mercury Mercury is the closest planet to the Sun and the eighth largest. In Roman mythology Mercury is the god of commerce, travel and thievery. The planet probebley got this name because it moves so fast around the sun. Another reason is because it is a small quick silver planet. Mutch like mercury whos name stands for quick silver. It was also given two names by the greeks: Apollo for its apparition as a morning …

…surface is heavily cratered and very old it also has no plate tectonics. Mercury is the second densest major body in the solar system, after Earth. Actually Earth's density is due in part to gravitational compression; if not for this, Mercury would be denser than Earth. This indicates that Mercury's dense iron core is relatively larger than Earth's, probably comprising the majority of the planet. Mercury therefore has only a relatively thin mantle and crust.