THE MOON
The moon is the earth's nearest neighbor in space. In 1969, this is huge natural satellite of the earth became the first object in space to be visited by human beings.
the moon at a glance
Age: About 4.6 billion years old
Distance from the earth: 221,456 at its shortest, at its longest it is 252,711.
Diameter: About 2,160 miles
Circumfrence: about 6,790
Surface area: about 14,670,000 square miles
Rotation Period: 27 days, 7 hours, 43 minutes
Revolution around the earth: 27 days, 7 hours, 43 minutes
Average speed around the earth: 2,300 miles per hour
Length of day or night: About 15 earth days each
Temperature at equator: sun at zenith over maria, 260 F. Lunar night over maria, -280 F.
Surface gravity: About 1/6 that of earth
Escape velocity: 1½ miles per second
Mass: 1/81 that of the earth
Volume: 1/50 that of the earth
Atmosphere: little or none.
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