China Education Equipment Procurement Network News: There has been a lot of talk about the origin of the moon. However, the current mainstream view is that the moon and the earth should be "of the same age", formed about 4.6 billion years ago in a "big collision": a large celestial body collided with the original earth after the lava material was cooled to form the moon.
Lunar orbit data shows that there is a large amount of plagioclase on the surface of the moon. The researchers concluded that this lightweight ore is most likely to float on the surface of the magma during the early formation of the moon, and then cool and crystallize. By measuring the age of this rock, the age of the moon can be estimated.
"Although it is gray, it is not as old as you think." The British "New Scientist" magazine website recently reported that an international joint research team found that the moon may be much younger than previously thought. Be over 4.4 billion years old. If this research is confirmed, many textbooks and research materials may face revision.
The moon rock samples used by the scientists in this study were found by the astronauts of Apollo 16 near the Descartes crater on the lunar surface. But these samples contain very small amounts of lead isotopes for labeling and some lead dust from earth pollutants. Russ Borg and his colleagues at the Lawrence Livermore National Laboratory in the United States washed one of the rock samples with a weak acid to remove the surface layer that might be contaminated with lead, and then re-determined its age.
They were surprised to find that the age of the moon is only 4.36 billion years, which is 240 million years younger than the previous answer.
Richard Carson, a geochemist at Carnegie Institution of the United States, said: "The test results mean that either the moon will solidify later than previously thought, or we need to completely change our understanding of the history of lunar chemistry.
Cliff Neal of the University of Notre Dame in Indiana also proposed another possibility. He said that some plagioclase including this sample is most likely to undergo the process of melting and cooling again after the formation of the moon. Different minerals will solidify under different temperature conditions, so if the heavy mineral solidifies before the light mineral below it, it will sink and push the magma to the upper part. This may change the age of plagioclase. "However, I still believe that the actual age of the moon should be comparable to the results of the new research." Neal said.
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