Mercury

The Hot Rock

Mercury is the second-smallest planet. It is the only known planet on which a day is longer than a year. A year is the time it takes a planet to orbit the Sun.

A year on Mercury lasts only 59 days. A day is measured from sunrise to sunrise. On Mercury, the time between one sunrise and the next is 180 Earth days.

Facts About Mercury

Rotational Period: 58.6 Earth days
Volume(Earth=1): 0.056
Density(Water=1): 5.43
Temperature at surface: -180�C to +430�

Mercury Statistics

Distance from the sun: 57.9 mkm
Orbital velocity: 47.89 km/s
Year length: 87.9 days
Diameter: 4,878 km
Mass: 0.0558 Earth-mass
Satellites: 0

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Last revised: 01 November 2000

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