Mercury was named after the speedy messenger of the gods because it seemed to move more quickly than the other known planets. In 2004 NASA launched its MESSENGER probe, which is due to reach Mercury in 2011.
Diameter: 4,880 km
Mass: 3,302,000,000,000 tonnes
Average distance from Sun: 57,909,175 km
Rotation: 58,6462 days
Orbit: 87.869 days
Average temperature: +166.86 ◦C
Moons: 0
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