Mercury is the smallest planet in our solar system, with a diameter of about 4,880 kilometers (3,032 miles), which is roughly 38% that of Earth. It has a rocky composition and a dense metallic core, giving it a mass similar to that of Mars despite its smaller size. Mercury's surface is heavily cratered, resembling the Moon, and it lacks a significant atmosphere, leading to extreme temperature variations. Overall, its compact size and unique characteristics make it a fascinating object of study in planetary science.
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