What is the smallest known planet in the Solar System? How much smaller is it than earth?
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Mercury—the smallest planet in our solar system and closest to the Sun—is only slightly larger than Earth's Moon.
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Mercury—the smallest planet in our solar system.
Size of earth is Earth's polar radius is Earth (6,371 km / 3,959 miles)
and mercury is (2,440 km / 1,516 miles) – 38% the size of Earth
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