Mercury Facts

Mean distance from Sun: 0.3871 AU (57,910,000 km/35,980,000 mi)
Length of Year: 88 days
Rotation period: 58.65 days
Mean orbital velocity: 48 km/s (30 mi/s)
Inclination of axis:
Average temperature: 800° F (427° C) day
-300° F (-183° C) night
Diameter: 4,878 km (3,031 mi)
Number of observed satellites: 0

Comparisons with Earth:
Diameter: 0.38 x Earth's
Mean Distance from Sun: 0.387 x Earth's
Earth's Mass: 0.055 x Earth's
Density: slightly less than Earth's

Mercury Globe

All information and images on this page were obtained from the National Air and Space Museum except the bottom picture from NASA.

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