The Moon is almost totally deprived of atmosphere, inert and practically immutable since the time when the current crust formed, three billion years ago. It is a place where testimonies of facts that date back to the origins of the Solar System are preserved.
The lack of atmosphere causes the great thermal difference that exists between the parts of the Moon exposed to the Sun, more than 100 degrees, and those that are in shadow, which can reach 150 below zero.
The first difference that can be seen by observing the surface of our natural satellite with the naked eye is the existence of darker regions in a lighter global context, known as seas and lands. But on the Moon there are no traces of water or, at least, it has not been found so far. The lunar seas have names like Ocean of Storms or Sea of Tranquility.
If we look at the Moon with the help of an optical instrument we will also see many craters, caused by the rain of blocks of different sizes that ravaged the Solar System at the time of the formation of the planets, when the rain of asteroids and meteorites was more intense . Only bodies with little or no atmosphere have kept them intact. Today the meteorites continue to fall on the Moon, but at an enormously lower rate.
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