The video discusses the "hidden side" or "dark side" of the moon, which is the side of the moon that always faces away from Earth. The name "dark side" was given because it was a mystery to humans, not because it's always dark. The far side of the moon is not visible from Earth due to the moon's synchronized rotation with our planet.
The video explains that the far side of the moon was first imaged by a Soviet probe in 1959. Since then, several missions have been sent to study this side, including a Chinese probe that landed on the far side in 2018. This probe, Chang'e 4, studied a large crater and brought seeds and silkworm eggs to test if the moon could support life.
The video also mentions that China plans to send astronauts to the moon and build its own space station. The dark side of the moon is not as mysterious as it seems, and it's similar to the near side, with craters and gray ground. The main difference is that the far side is calmer, with less interference from radio signals.
Here are the key facts extracted from the text:
1. The moon was the first celestial body to be visited by humans.
2. The origin of the moon is still not entirely certain.
3. The far side of the moon, also known as the "dark side," is a region that we cannot see from Earth due to the moon's synchronized rotation with its orbit around our planet.
4. The term "dark side" was coined in 1959 because it was a region that had never been seen before, not because it receives no sunlight.
5. The far side of the moon is not completely dark and has day and night periods, just like the near side.
6. The day and night periods on the far side of the moon last about 14 Earth days each.
7. The far side of the moon is slightly thicker and has more craters than the near side.
8. The Chinese probe Chang'e 4 was the first to land on the far side of the moon, on December 7, 2018.
9. The Chang'e 4 probe was launched with the mission of exploring the far side of the moon and studying a huge crater called the South Pole-Aitken basin.
10. The South Pole-Aitken basin is about 2,500 kilometers in diameter and 13 kilometers deep, making it the largest impact crater in our solar system.
11. The Chang'e 4 probe carried a container with potato seeds, a plant in the same family as cabbage and mustard, and silkworm eggs to test if the moon's surface can support life.
12. The far side of the moon is calmer and free from interference from radio signals or other signals from Earth.
13. China plans to build its own space station, with construction starting in 2020 and operations beginning in 2022.
14. The first human mission to the moon was Apollo 11, which took place in July 1969.
15. China announced plans to send a crew of astronauts to the moon in 2017, which would be the first time humans have visited the moon since the 1970s.