About 40 million years after the formation of the solar system, there was a strong collision between the young Earth and planetary celestial bodies. This means that the final stage of the formation of the earth is 60 million years earlier than previously thought.
Scientists from the University of Lorraine (UL) in Nancy, France, presented the latest research results on the age of the earth at the Geochemistry Conference in Sacramento, USA. They found an isotope trace, which indicates that early estimates of the age of the Earth and Moon were inaccurate.
Generally, the more deeply a scientist studies the history of the universe, the more difficult it is to determine the dates of individual events that occurred on the young Earth. Part of the reason is the lack of geological materials (such as old rock layers, etc.) on which such dating is based. Therefore, geochemists must rely on other methods to assess past events on Earth. The standard scope of these methods includes studying the changes in the proportions of various gases (or more precisely, their isotopes) that have existed since the young age of the earth.
Isotopes are various elements with different numbers of neutrons and protons in the nucleus. In fact, the isotopes of an element differ in physical properties, such as density, boiling point, and melting point. When the rock melts and evaporates, the lighter isotopes evaporate faster than the heavier isotopes. Therefore, the ratio of isotopes (for example, the ratio in the gas trapped in the microscopic pores of minerals) makes it possible to judge when these minerals formed.
UL’s Guillaume Avice and Bernard Marty used this method to study xenon, a gas that exists in the pores of quartz in southern Africa and Australia. The age of the quartz block has been determined to be 340 and 2.7 billion years respectively.
The gas trapped in the quartz is like a “time capsule”. It allows Avice and Marty to compare the ratio of xenon isotopes-the ratio of xenon isotopes to isotopes that were still in the air billions of years ago. Scientists used this ancient gas to improve the existing dating technology and more accurately estimated the time when the earth began to form.
Calculations show that the collision between the earth and another celestial body that formed the moon occurred 60 million years earlier than previously thought.
So far, it is said that the earth’s atmosphere began to form about 100 million years after the formation of the solar system. Because the atmosphere is not immune to the impact of the impact (produced by the moon), scientists recommend re-examining history and postponing the formation of the atmosphere to 40 million years after the formation of the solar system.
“There is no exact date when the earth was formed. However, our work shows that the earth is about 60 million years older than we thought.
“This seems to be a small difference. Still important. These differences set a time limit for the evolution of planets, especially during the major collisions that have shaped the distant history of the solar system.” (PAP)