Moon is a rocky old ball of 4.6 millions of years, which makes a complete rotation around Earth every 27 days, 7 hours and 43 minutes.

The diameter of Moon is about 3.476 kilometres, more than one quarter from the diameter of Earth. Its mass is about 1/81 from these last one, and its density is 3/5.

The lunar gravity is about 1/6 from the gravity of Earth.

The temperature into surface raises up to 100°C at lunar half-day, and falls below to –155°C in the half-light.

The lunar surface is rocky and covered with craters. Mounts and hills surround immense plains! The lunar mountains, which heights reach 7800 meters, are comparable to the highest summits on Earth, but they are not generally very steep.

Moon turn in the anticlockwise at a speed from about 3476,18 km/hour.  By her elliptical orbital revolution, its distance to Earth varies 365.000 km at its perigee, 409.000 km at its apogee, when Moon keeps off Earth. The average distance is 385.000 km or about 60 times, the Earth radius.

The rotation plane is tilted about 5 degrees in relation to the elliptical.

There is no air on Moon (so none sounds) : according to the NASA,  it is recently announced the presence of water, between 10 and 300 millions of water tonnes under the shape of ice would be buried in the underground from the craters of lunar poles.

It exists darker areas on Moon. These last one are really dry, but a long time ago, the astronomers thought that they were recovered with waters, hence their names “sees”. In fact, it is the interior of great craters which covered from cold magma, risen again during deep impacts four millions years ago.