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What is the Second Smallest Planet in the Solar System? - Universe Today
Pluto used to be the smallest planet, but it’s not a planet any more. That makes Mercury the smallest planet in the Solar System. The second smallest planet in the Solar System is Mars, measuring 6792 km across. With all the focus and exploration of Mars, you’d think it’s a really big planet, but actually … Continue reading "What is the Second Smallest Planet in the Solar System?"