The Earth suffers from dozens of collisions with asteroids

One of the most popular scientific hypotheses today is that, 65 million years ago, an asteroid about 10 kilometers in diameter had hit the earth causing an extinction for dinosaurs.

However, according to a new NASA announcement on April 25, the analysis of an international research group showed that during evolution, the earth may have been hit by dozens of asteroids with dimensions. Such a small ruler.

The evidence that the researchers gave is that microsphere particles are as small as millimeters in ancient stone in Australia. They believed that lava dust shot out in the air after asteroids struck the earth, they were cooled, frozen and fell to the surface, eventually forming thin but widely distributed Microsphere layers. spread in the layers of Earth's rock.

The results of computer simulations by scientists show that 1.8 billion to 3.8 billion years ago had about 70 larger asteroids or the size of asteroids that caused extinction for the giants. long, hit the Earth, this frequency is higher than previous calculations. During this time, the Moon was also hit by four similar sized asteroids.

Head of the research team, planetary researcher William F.Bottke, of the Southwest Research Institute, said the Microsphere class has proven that Earth's history has been attacked continuously, but before that it was The roots of Microsphere floors are still a mystery.

The study report published in the April 25 issue of the journal Nature, said researchers believe their analysis also supports the theory of Jupiter, Saturn, Uranus and Neptune. was formed 4.5 billion years ago.

4 billion years ago, under the influence of gravity in the Solar System, they gradually moved in the current orbit, simultaneously causing large-scale collisions between asteroids and comets.