Jade rabbit, luminous, Su E, ice wheel, jade wheel, jade toad, ghost woman, toad, ancient rabbit, Chanjuan, jade bow, jade laurel, jade plate, jade hook, jade mirror, ice mirror, Guanghan Palace and Chang 'e.
The diameter of the moon is about a quarter of that of the earth, and its mass is about one-eighty-first of that of the earth. The moon is the largest satellite known to earth, and its surface is covered with craters formed by the impact of small celestial bodies. The average distance between the moon and the earth is about 384,400 kilometers, which is about 30 times the diameter of the earth.
Extended data:
The moon may have formed about 4.5 billion years ago. Shortly after the formation of the earth, there were several hypotheses about its origin. There is more factual evidence to support the "big collision origin theory" formed by the debris generated by the huge collision between the earth and the Martian-sized celestial body "Teia".
There are a large number of huge impact craters on the front of the moon, which are filled with basalt lava flows from dark volcanoes, forming a vast plain called "Moon Sea". In fact, there is not a drop of water in the Moon Sea. There are bright and ancient plagioclase highlands and obvious impact craters between the periphery of the Moon Sea and the Moon Sea.
It is the brightest celestial body in the sky except the sun. Although it is very bright white, the surface is actually very dark, and the reflectivity is only slightly higher than that of old asphalt. Because the moon is very conspicuous in the sky, coupled with the regular changes in the phases of the moon, it has had a great influence on human culture such as myths and legends, religious beliefs, philosophical thoughts, calendar compilation, literature and art, customs and traditions.
The rotation period of the moon is equal to period of revolution (called tidal locking), so the moon always faces the same direction of the earth. The earth's ocean tides are mainly caused by the gravity of the moon.
Because the tidal force of the earth's ocean is opposite to the direction of the earth's rotation, the earth's rotation is always "braked" by an extremely weak force, which accumulates over time. There is ample evidence that the earth's rotation cycle is getting slower and slower, and the time of day is growing very slowly, increasing by 1 second in a few years.
Due to the reaction of the earth, the moon is getting farther and farther away from the earth, about 3.8 cm away from the earth every year. The ratio of the size of the moon to the sun is close to the ratio of the distance, which makes its apparent size almost the same as that of the sun. During a solar eclipse, the moon can completely cover the sun and form a total solar eclipse.
Baidu Encyclopedia-Moon