A lot of meteorite collisions were 4.4 billion years ago. The history of the earth was also reviewed. Hiroshima University etc. September 5 4:48

It is said that there were times when a large number of meteorites fell on the earth as the solar system formed, but research groups such as Hiroshima University have said that this time is the largest than ever thought. It is said that it is about 500 million years old and may have been about 4.4 billion years before life was born, and it is a result that will lead to a review of the early history of the earth.

During the formation of the solar system, there is a period called the "late heavy bombing period" when many meteorites have fallen on the earth and the moon, but until now, just after life was born from the analysis of the crater of the moon It is estimated to be about 3.9 billion years ago, and studies are being conducted on how life survived.



Research groups such as Assistant Professor Mizuho Koike of Hiroshima University have measured the elements of meteorites from asteroids that were thought to have collided during the "late heavy bombing period" using the latest analytical methods.



As a result, the period of the collision was approximately 4.4 to 4.1 billion years ago, and the "late heavy bombing period" may be 200 to 500 million years older than previously thought. Did.



The study group said the sample might have been biased in the analysis of the Moon crater.



Assistant Professor Mizuho Koike of Hiroshima University said, "Because the meteor falls before the appearance of life on the earth, it is a result that will lead to a review of the early history of the earth before and after the birth of life."