Mercury

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Mercurysearch for term: The first planet from the Sun in the Solar System. Mercury orbits the Sun at an average distance of 0.4 A.U.. The planet has a mass 0.055 times the mass of the Earth and a radius 0.4 times the radius of the Earth. It is made of solid, rocky material that is heavily cratered, and it has no significant atmosphere. Mercury has no moons.