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The most Mercury-like planets would be Venus, Earth and Mars. All 4 planets share similar composition, for example; a rocky surface, smaller diameter, and much denser body. -- But contrasted to Mercury; Earth, Venus, even Mars is quite a bit larger in size, and each of these planets has some sort of atmosphere. Mercury would be most comparable, really, to our own Moon. They are about the same size, and they are both geologically dead. In other words, both solar bodies have no atmosphere and no sub-surface geological activity.

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14y ago

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