- The Moon
- Diameter- 3500km
- Distance from the Earth- 380 000km
- Strength of gravity- 1/6 of the Earth's due to its relatively small mass
- Rotational and orbital period- 27.3 days
- The far side of the moon is not visible from Earth
- The far side of the moon was first observed with a dual lensed camera on the unmanned Soviet probe- Luna 3 in October 1959. The images were then transmitted back to Earth.