Planet
Mercury
TypePlanet
Mass3.301 × 10²³ kg
Diameter4,879 km
Orbital Radius57.9 million km
Orbital Period87.97 days
Rotation Period1,407.6 hours
Known Moons0
Surface Gravity3.7 m/s²
Average Temp167 °C
AtmosphereMinimal (O2, Na, H2)
Discovered ByKnown since antiquity
About Mercury
The smallest planet and closest to the Sun. Has no atmosphere to retain heat, causing extreme temperature swings between day (430C) and night (-180C). Its surface is heavily cratered, similar to our Moon. Mercury has a large iron core that takes up about 75% of the planet radius.
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Planet
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