The moon has been an object of human exploration and imagination since ancient times. In the clear night sky, people look up at the bright moon, and countless questions inevitably arise in their hearts. From ancient myths and legends to modern scientific exploration, the moon has always been shrouded in mystery. The story of Chang'e's flight to the moon, the belief in the god of the moon, and even some bold speculations, such as the claim that aliens control the moon to spy on the earth, make people curious about this natural satellite of the earth. Now that humanity has entered the space age, we are learning more about the moon, but there are still many mysteries that remain unsolved.

When it comes to the milestone of human exploration of the moon, we have to mention the Apollo moon landing program of the United States. This project allowed humans to set foot on this mysterious planet for the first time, bringing back a large number of rock samples and scientific data. However, during the Apollo mission, the astronauts discovered a shocking phenomenon when they explored the surface of the moon - the interior of the moon seemed to shake strangely. This discovery has sparked many speculations, one of which is highly controversial: the moon may be hollow. But if the interior of the Moon is hollow, then how does its magnetic field come about?

Currently, there is a generally accepted view in the scientific community that there is a hot core on the Moon. Researchers at the National Aeronautics and Space Administration (NASA) have found that when the temperature drops to a certain critical point, the rocks on the moon become magnetized, further complicating the origin of the moon's magnetic field. In contrast, the source of the Earth's magnetic field is already clear, and it is closely related to the flow of molten iron inside the Earth's core. However, the Moon's magnetic field is not so simple. Even more puzzling is that the Moon's magnetic field is not uniform, and scientists speculate that this may have something to do with the Moon's historical evolution.

In fact, the Moon has a much greater impact on the Earth than people think. The Earth's tidal phenomena are a direct result of the Moon's gravitational pull, and studies have shown that the Moon's gravitational pull may also have an impact on the Earth's core movement. There is an assumption that the tidal forces of the Moon to some extent affect the formation of the Earth's magnetic field, making the Moon not just a satellite revolving around the Earth, but an "invisible agent" that has an important impact on the Earth's environment.

Even more surprisingly, when scientists analyzed the lunar rocks brought back by the Apollo mission, they found that the moon once had a magnetic field stronger than that of Earth, and that this magnetic field lasted for more than a billion years. This discovery overturns many previous theories about the Moon's magnetic field. Researchers speculate that there was once a supergenerator-like structure inside the moon, and that the mantle part may not have been completely cooled and hardened, and that the interior still maintained some kinetic activity.

There are also different theories about the origin of the moon. Among them, the widely accepted "giant collision hypothesis" holds that in ancient times, the Earth collided with a celestial body the size of Mars, and the huge impact caused a large amount of debris to enter orbit, and eventually formed the moon. However, if this hypothesis is true, then the composition of the Moon should be similar to that of the Earth, but studies have shown that certain key elements are missing from the rocky composition of the Moon, suggesting that the formation process of the Moon may be more complex than we think.

Not only that, but the difference between the "front" and "back" of the moon is huge, which is also an unsolved mystery. Due to the tide-locking effect, the Moon is always facing the Earth on the same side, while the far side remains hidden from our view. Photographs taken by the probe of the far side of the moon show that its terrain is more rugged than the front, and the number of impact craters is higher, indicating that it has experienced more intense external forces. This asymmetry has puzzled scientists and may be related to the tectonic and evolutionary processes inside the Moon.

In recent years, the enthusiasm for exploring the moon has heated up again. China's Chang'e probe, Japan's lunar mission, and the U.S. planned Artemis program are all revealing more secrets about the moon. In particular, the lunar south pole region, where there may be abundant water ice resources, is considered an ideal site for a future human lunar base. Once humans establish a long-term stay on the moon, it will greatly promote the development of space exploration.

In any case, the moon is not just a bright moon in the night sky, it carries the endless desire of human beings to explore and curiosity about the universe. With the advancement of technology, perhaps in the near future, we will be able to solve all the mysteries of the moon, so that it is no longer just a fairyland in myths, but an important starting point for mankind to move towards the sea of stars.