Mercury (Mercury) as a planet, which is closer to the Sun, most are small planets, and the Moon is not subject to. The internal structure of mercury and consists of a large iron cores are approximately 1,900 kilometres radius up to 1800, surrounded by a silicate layer (similar to that in the Earth's axis is wrapped with a metal shell and a man), which is only 600 km thick, up to 500 portions of the axis may be melting are also.
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