Theories Of The Origin Of The Moon

The moon is the only natural satellite on Earth. It is about 384,400 kilometers from the earth, with a diameter of 3,476 kilometers and a mass of 35 * 1022 kilograms. It has many names in history: Romans are called Luna, Greeks are called Selene and Artemis. Of course, I know prehistoric times already. It is the second brightest object in the sky after the sun. Because of its size and composition, the moon is sometimes classified as the "planet" of the Earth with Mercury, Venus, Earth and Mars.

Origin of the Moon Before the modern era of space exploration, scientists had three major theories about the origin of the moon: nuclear fission from the earth, formation of the orbit of the earth, and away from the world. Then, in 1975, after he studied the moon rock and moon close-up photographs, the scientists proposed what would be most likely to be considered for the formation theory, the influence of the stars or the huge shock theory. The latest version of this theory suggests that the moon will spin out of the earth when the earth is young and turning rapidly around its axis. This idea was supported as the density of the moon was the same as the density of the rock under the Earth's crust or upper mantle. One of the main difficulties of this theory is that the angular momentum of the earth must be much larger than the current Earth-Moon's angular momentum to achieve rotational instability.

There was a time when the moon did not exist, but it has been done over 4 billion years ago. The huge crash theory of the origin of the moon is currently the most popular theory, but there are many other theories (Figure 1). All of these theories, including gigantic collision theory, have the problem of explaining the Earth's moon system and some aspects of its origins. The oldest theory of the origin of the moon was proposed by Charles Darwin's son George Darwin (1879). He imagined that the original Earth rotates very fast and the moon-sized body forms a moon away from the Earth by centrifugal force. However, although this theory was rebutted later, it was revived by Ringwood and Wise in the late 1960s, but it is still a viable assumption for the formation of the moon. However, there are two problems in the fission scenario: the angular momentum (rotation) of the earth needed to form the moon.