moon - is, as everyone knows, only very large satellite of our planet.Even in ancient written sources, lasted until the present day, including the Bible, it is referred to as "night-shining".And no wonder - because in the visible sky this object is the second largest after the brightness of the sun.The diameter of the moon is about four times less than the Earth's.Its volume is only about two percent of the same indicator "blue planet".The force of gravity on the "night luminary" six times less than on Earth.Accordingly, the acceleration due to gravity at its surface is 16.7% of that to which we are accustomed.In particular, this is indirectly confirmed by the stories of astronauts who traveled to this extraordinary natural satellite.
between the Moon and the Earth there is a gravitational attraction, helped by the distance between them and the ratio of their masses.One of the consequences of this phenomenon on the planet - it's the ebb and flow.They are visible in almost all of its water surfaces.In turn, the interaction energy is absorbed by the Earth and the Moon because of the tides.Due to the distance between the planet and its companion is increasing by about four centimeters per year.But that's not all, because of the interaction of the Earth's motion around its own axis is constantly hampered.Because of this, for every one hundred years, the length of the day increases by some fraction of a second, and, in addition, increases the period of revolution "cold light" around the planet or, as they say, the cycle of the moon.Now it is a little more than 27 days and 13 hours.
In our time, the average distance to the moon is about 384,401 km.It's almost 60 equatorial radius of the planet.The diameter of the moon is much smaller than the Earth, as mentioned above.Its volume is 2.03% of the same figure of our planet.In numerical terms, the diameter of the moon corresponds to 3476 km.The light from it 500,000 times fainter than the Sun.Before it reaches Earth in just 1.3 seconds.It is the largest moon in the Solar System that are larger than the planet Pluto.
Interestingly, the moon has its own beach.There are many, and scientists examined the surface of the "Night of Light" had to give them all a name.But if the area of land covered by the waters of more than 70%, then the moon pools seas occupy 30-40% of its entire visible surface.Its atmosphere is characterized by a high vacuum.This causes frequent and sudden changes in temperature - from the bitter cold, not set aside any chance for life to +120 degrees.Because of the moon have no shell of ozone or other gas, the sky with its surface always appears black.From there, you can see only the portion of the Earth, which is illuminated by the sun.
In our time, this much is known satellite diameter of the moon, its distance, about calculate its mass.However, there are "white spots" in the knowledge of scientists.So far, not known for certain the structure of its core.However, according to some research scientists, it is most likely similar to Earth and is a huge red-hot metal ball.
