A large number of meteorite collisions were 4.4 billion years ago, and the history of the Earth was reviewed at Hiroshima University.

A large number of meteorite collisions were 4.4 billion years ago, and a review of the history of the Earth was held at Hiroshima University on September 5 at 4:48 a.m.

Aling it is said that there was a time when a large number of meteorites fell on the earth during the formation of the solar system, research groups such as Hiroshima University announced that this period could have been up to 500 million years older than previously thought and about 4.4 billion years before life was born, leading to a review of the Earth’s early history.
In the formation of the solar system, there is a time called the “late heavy bombing period” in which many meteorites are said to have falled on the earth and the moon, but until now, analysis of craters on the moon is estimated to be about 3.9 billion years ago, just after life was born, and research has been conducted on how life survives.

A group of researchers, including Assistant Professor Mizuho Koike of Hiroshima University, 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 time of the collision was about 4.4 billion years ago to 4.1 billion years ago, and the “late heavy bombing period” could be about 200 to 500 million years older than previously thought.

The research group said that the analysis of the craters of the moon may have biased the samples.

Mizuho Koike, an assistant professor at Hiroshima University, said, “Since the time when meteorites fell was before life appeared on the earth, it is an achievement that leads to a review of the early history of the earth before and after the birth of life.”