Researchers studied soil samples brought to Earth by China's Chang'e 5 and Chang'e 6 missions and made an important discovery.. It turned out that the Moon's magnetic field existed about 200 million years longer than expected.. Why this happened is not entirely clear, but there are some assumptions. The study was published in the journal Science Advances, writes Interesting Engineering.

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Scientists now believe that for about 1.5 billion years after the birth of the Moon, the Earth's satellite had a magnetic field as strong as Earth's.. It is estimated that its strength ranged from 25 to 65 microtesla.

Now the Moon has no magnetic field and it was believed that it began to weaken and disappeared about 3 billion years ago. Now, a study of lunar soil samples brought to Earth by two Chinese missions shows that the magnetic field of our planet’s satellite existed longer and at the same time some processes led to its strengthening.

Past studies have shown that already about 3.1 billion years ago, the Moon’s magnetic field began to sharply lose its strength and disappeared after several tens of millions of years.. New data shows that the magnetic field has strengthened and was able to last for several hundred million years.. That is, scientists discovered signs of the existence of a magnetic field in rocks 2.8 billion years ago.. But this magnetic field had a strength of 5 to 21 microtesla. That is, it was still weak, and only after this strengthening did it completely disappear.

Scientists believe that some internal processes could lead to both an unexpected strengthening of the Moon’s magnetic field and its complete disappearance. The study suggests that the resumption of the Moon's weak but stable magnetic field about 3 billion years ago could have been caused by processes such as crystallization of the Moon's core or interaction between the core and mantle.. These processes likely maintained the Moon's magnetic dynamo for billions of years..

Scientists also believe that the longer existence of the Moon's magnetic field could protect its surface from strong solar radiation longer, which helped preserve volatile compounds such as water on its surface. This deeper understanding of the Moon's magnetic history provides important clues about its evolution.

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