# Weight of the Moon, weight and other interesting facts

The natural and only satellite of the Earth, the Moon,After the Sun is the second object in brightness. In magnitude it is the fifth object of the solar system. Between the centers of the Moon and Earth, the average distance is 384,467 km. The mass of the moon corresponds to a value of 7.33 * 1022kg.

Since ancient times people have made attemptsdescribe and explain its movement. The basis of all modern calculations is the theory of Brown, which was created at the turn of the XIX - XX centuries. To determine the precise movement of this celestial body, not only the mass of the moon was needed. Numerous coefficients of trigonometric functions were taken into account. Modern science can carry out more accurate calculations.

Laser location allows you to measure the sizecelestial objects with an error of only a few centimeters. With its help, it was found that the mass of the moon is much smaller than the mass of our planet (81 times), and its radius is 37 times less. For a long time it was not possible to accurately determine this value, but the launch of space satellites opened new prospects. An interesting fact is that in Newton's time the mass of the Moon was determined by the magnitude of the tide it caused.

We can see the illuminated surface differentlythis satellite. The visible part of the disk illuminated by the Sun is called the phase. In total, there are four phases: the completely dark surface of the moon is the new moon, the growing lunar crescent is the first quarter, the fully lit disk is full moon, the illuminated half on the second side is the last quarter. They are expressed in hundredths and tenths of a unit. The change of all the lunar phases is the synodic period, which represents the Moon's turning from the new moon phase to the subsequent new moon. It is also called the synodic month, equal to about 29.5 days. During this period of time, the Moon will be able to traverse the orbit and twice to catch time in the same phase. The sidereal period of circulation, lasting 27.3 days, is the complete revolution of the Moon around the Earth.

It is erroneously spread thatThe surface of the Moon we see from one side and the fact that it does not rotate. The movements of the Moon take place in the form of rotation around their axis and rotation around the Earth and the Sun

A complete revolution around its own axis occursfor 27 terrestrial days 43 min. and 7 hours. Conversion along an elliptical orbit around the Earth (one complete revolution) occurs at the same time. This is influenced by tides in the lunar crust that cause tides on the Earth that occur under the influence of the lunar attraction.

Being at a farther distance from the moon thanEarth, the Sun because of its enormous mass attracts the moon twice as much as the Earth. The Earth distorts the trajectory of the Moon's revolution around the Sun. In relation to the Sun, its trajectory is always concave.

The moon has no atmosphere, the sky over it is alwaysblack. Due to the fact that sound waves do not propagate in a vacuum, there is complete silence on this planet. Under the direct rays of the sun, the temperature in the daytime is many times higher than the boiling point of water, and at night reaches -150 C. The specific gravity of the moon is one. Its density is only 3.3 r. more water. On its surface there are huge plains, which are covered with frozen lava, many craters formed during the fall of asteroids. The force of gravity is inferior to the gravity of the earth, and the weight of the moon is smaller than the Earth, so the weight of a person's body can decrease by a factor of 6 when on the Moon.

According to radioactive substances, scientists have determinedthe approximate age of the Moon, which is 4.65 billion years. According to the last most plausible hypothesis, it is assumed that the formation of the Moon was due to a gigantic collision with the young Earth of a huge celestial body. According to another theory, the Earth and the Moon were formed independently in completely different parts of the solar system.