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Mercury’s atmosphere thickened as we watched. The likely perp? Meteoroids. – SYFY WIRE

Mercury is the smallest planet in the solar system.

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Mercury is the smallest planet in the solar system. Its a ball of rock and metal just under 5,000 kilometers across (about 40% wider than our Moon), and the closest planet to the Sun. That means its hot, of course, with a surface temperature that reaches…

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