(AU) is 0.4 mercury is the closest planet to the sun. And is the smallest planet (0.055) times the mass world) mercury no satellites themselves. Besides the surface with potholes, collision, a steep ridge Which may occur during the generation process of formation at the beginning of the history.Consist of atoms was the solar wind blow drive until almost all the core of the star is steel with a relatively large. Later I thin crust , who still can't explain clearly.Some say it was excluded from the mask layer due to combination of tremendous energy of sun Yao
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