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Mercury

A red-hot chunk of rock which is littered with meteorite craters and which has only a very thin atmosphere. The side opposite to the Sun is very cold.

Distance from the Sun: 0.35 AU
Mass: 0.055 * Earth
Diameter: 0.38 * Earth (4880 km)
Surface temperature: 440 kelvin
Orbit period: 87.969 days
Moons: 0

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Photo: NASA / Johns Hopkins University Applied Physics Laboratory / Carnegie Institution of Washington
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