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MercuryNope. You picked Mercury, the eighth largest planet in diameter in the solar system. Mercury's temperature ranges from 90 K to 700 K. The planet itself is the second densest major body in the solar system. (The Earth is the most dense.) Mercury's iron core covered by a thin silicate mantle and crust. Only one spacecraft, Mariner 10, has ever visited (in 1973 and 1974).

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