The Moon is an astronomical body that orbits planet Earth and is Earth's only permanent natural satellite. It is the fifth-largest natural satellite in the Solar System, and the largest among planetary satellites relative to the size of the planet that it orbits (its primary).

The Moon is after Jupiter's satellite Io the second-densest satellite in the Solar System among those whose densities are known.

Moon age
The Moon is thought to have formed about 4.51 billion years ago, not long after Earth. The most widely accepted explanation is that the Moon formed from the debris left over after a giant impact between Earth and a Mars-sized body called Theia.

Mean radius
1737.1 km
This is 0.2727 of Earth's mean radius

Equatorial radius
1738.1 km
This is 0.2725 of Earth's equatorial radius

Polar radius
1736.0 km
This is 0.2731 of Earth's Polar radius

Surface area
3.793×107 km2
This is 0.074 of Earth's surface area

Volume
2.1958×1010 km3
This is 0.020 of Earth's volume

Mass
7.342×1022 kg
This is 0.012300 of Earth's mass

This and more extensive information on Wikipedia

12 PEOPLE WHO WALKED ON MOON
1 Neil Armstrong
2 Buzz Aldrin
3 Pete Conrad
4 Alan Bean
5 Alan Shepard
6 Edgar Mitchell
7 David Scott
8 James Irwin
9 John Young
10 Charles Duke
11 Eugene Cernan
12 Harrison Schmitt

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