At 10:26 a.m. on January 3, 2019, the Chang’e IV probe completed its first soft landing on the back
of the moon after 26 days and more than 600 hours of flight. The first close-range photograph of the back
of the moon was sent back by the Magpie Bridge relay star, which revealed the mystery of the ancient back of the moon.
Moon” was published by scientists. Let’s take a look at some interesting facts about the Moon.
For many people, the phases and orbits of the moon are very mysterious. For example, we always see the same “face” on the moon.
This is mainly because it takes 27.3 Earth days for the moon to rotate around the earth, so we can see the full moon, half moon or crescent moon
based on the changes in the reflected light of the moon. The phase of the moon we observe depends mainly on the position of the moon relative to the earth and the sun.
Although the moon is a satellite of the earth, its diameter is about 3475 kilometers, even more than Pluto’s. The moon is slightly larger
than a quarter (27%) of the Earth’s volume, while other planets and satellites in the solar system usually have a volume ratio of less than 4:1. This
means that the Moon has a great impact on the Earth, and it may be the reason for the existence of life on Earth.
There are many explanatory theories about how the moon formed, but the latest evidence suggests that it may have been formed in a huge collision.
The mainstream explanation for the formation of the moon is a huge impact event that stripped the original composition of the
moon from the melting earth into the current Earth-Moon orbit. Scientists believe that the mass of the collision object is equal to 10% of the Earth’s and
its volume is close to Mars. Because the composition of the Earth and the Moon is very similar, researchers infer that the collision occurred 95 million
years after the formation of the solar system, with an error of about 32 million years (the solar system has a history of about 4.6 billion years).
In 2015, scientists further confirmed this theory in their latest research, based on simulations of early
solar system planetary orbits and the latest discoveries of W-182 abundance differences on Earth and the Moon.
Although the theory of large collisions dominates the discussion of the formation of the
moon in the scientific community, some scientists believe that the formation of the moon originates from other
processes and events, such as the gravitational capture of the moon, the separation of the moon from the earth, and the “stealing” of the moon from the Venus system.