Mercury

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Heavily cratered and nearly airless, this dead planet - much like Earth's moon - has changed little since volcanism ceased perhaps three billion years ago. A very thin atmosphere of sodium and helium remains

DISTANCE FROM SUN:57,900,000 km.
REVOLUTION AROUND SUN:88 days.
ROTATION:59 days.
DIAMETER:4,880 km.
DENSITY:5.4 * that of water.
MASS:0.055 * that of Earth.
SURFACE TEMPERATURE:430 C on dayside, minus 180 C on nightside.

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