The Moon

A Natural Satellite

The Moon is the only natural satellite of the Earth, and the fifth largest satellite in the Solar System. It is the largest natural satellite of a planet in the Solar System relative to the size of its primary, having a quarter the diameter of Earth but only _1/81 its' mass.

The Moon as seen from Ottawa.

You can learn more about the moon landings here

Statistics About the Moon

• Semi-major axis: 384,399 km
• Orbital period: 27.321582 days
• Average orbital speed: 1.022 km/s
• Mean radius: 1,737.10 km
• Surface area: 3.793 × 10⁷ kms²
• Volume: 2.1958 × 10¹⁰ km³
• Mass: 7.3477 × 10²² kg

The Apollo Moon Landings

1. Apollo 11 July 20, 1969
2. Apollo 12 November 19, 1969
3. Apollo 14 February 4, 1971
4. Apollo 15 July 30, 1971
5. Apollo 16 April 20, 1972
6. Apollo 17 December 11, 1972