Photo: David Becker / ZUMA / Globallookpress.com
An international team of astronomers has determined the exact time of the migration of gas giants in the Solar system that occurred about of 4.48 billion years ago. This indicates that the bombardment of Earth by asteroids and protoplanetary, which melted and sterilized the whole planet, could be faster than assumed in the previous studies. This publication reports Science Alert.
Scientists have created a model of the migration of the planets, analyzing the chemical composition of ancient asteroids and moon rocks. Last attempt to date was made on the basis of moon rocks collected during the mission “Apollo”, and the result was equal to 3.9 billion years ago. However, these data could be distorted by late collisions of meteorites with the Moon. If we consider all the remaining meteorites that fell to Earth, the end of heavy bombardment have on of 4.48 billion years ago.
The constant fall of meteorites and asteroids on the Earth was caused by the restructuring of the Solar system. Jupiter and Saturn migrated closer to the Sun, and Uranus and Neptune, on the contrary, they have withdrawn. The result was a large number of comets, asteroids and protoplanets. It is believed that the Earth was formed of 4.56 billion years ago so the first hundred million years ago it was in molten form because of the bombing and had no conditions for the emergence of life. Only 4.4 billion years ago some microbes could live in isolated ecosystems.
Video, photo All from Russia.