The moon, is the brightest celestial object in the sky after the sun. Moon has a strong gravitational effect on Earth, causing phenomena such as tides. It stabilizes the movement of the earth in its axis of rotation, which helped potential for growth and maintenance of life on our planet. The diameter corresponds to 1/4 (approximately) the diameter of the earth, and the gravity on the surface on the land of the moon is the 1/6 of the earth's. It revolves around herself in the same time that orbits the earth. Therefore, seeing from the earth always the same side. 

 

   Likely scenario creation of the moon, is the impact on the earth by a celestial body in the size of the Mars (which is placed in the first 100 million years after the formation of our solar system). The subsequent elimination of much of the earth's material then orbits around the earth, like the moon now. 

 

  Unlike other planets in our solar system wich have an atmosphere, or volcanic activity or still more moves in cortical surface, the moon without atmosphere (and the corresponding atmospheric corrosion), without 'recent' volcanic eruptions and without cell cortex, has an extremely stable surface on the existence of time. Truly it can be said that few celestial bodies in our solar system can tell so precisely their history, such as the moon. 

 

 

The impact basins (lunar seas) 

 

   They called seas in the 17th century by the first astronomers observers, because the perceived as our own seas. They gave them even more often romantic names, nomenclature maintained until today. Of course, it is not seas. The largest and most violent part of the bombing of the moon appears to be complete in the nectar season season had already created an impact basins known lunar seas. Then it seems that the volcanic energy of the moon completes and the stoped. Since the volcanic eruptions are formed by basaltic lava, it seems that this lava captured the impact basins, creating subsequent stratification, the lunar seas. In the unseen lunar hemisphere minimum "seas" were created because the crust in this region was thicker (at least 50%) of the beholder hemisphere. 

 

Craters 

 

     There are approximately trillion (3,000,000,000,000) craters on the moon with a diameter greater than one meter. By means of a telescope (150 mm), we can distinguish craters larger than 3km. There has been the term "annular basins" for craters larger than 300 km.