According to a recent report by the physicist organization network, scientists at Lawrence Livermore National Laboratory (LLNL) in the United States wrote in the latest issue of "Science" that they have studied the isotopes of molybdenum on meteorites and concluded that: About 4.5 billion years ago, our sun and solar system formed in just 200,000 years. This is the first time scientists have calculated the time required for the formation of the solar system.
The material that makes up the sun and the rest of the solar system came from the collapse of massive gas and dust clouds about 4.5 billion years ago. Previously, astronomers observed other star systems similar to the formation of the solar system, and estimated that it would take about 1 million to 2 million years for the collapse of cloud clusters and the formation of stars, but the latest research results indicate that the solar system we live in is special. http://www.ytswcyy.com/
The researchers explained that the oldest solids in the solar system are calcium aluminum mixtures (CAIs), and these samples directly record the formation of the solar system. CAIs range in size from micrometers to centimeters, and are formed in high temperature environments exceeding 1,026 degrees Celsius (similar to the "body temperature" of the young sun). Subsequently, they were transported to the area where the carbonaceous chondrite (and its parent) formed, where the scientists discovered them. Most CAIs were formed 4.567 billion years ago, and the formation time is about 40,000 to 200,000 years.
In the latest study, the research team measured various isotopes and trace elements of molybdenum extracted from carbonaceous chondrites, including the largest carbonaceous chondrite found on earth, "Allende". They found that different isotopes of molybdenum in CAIs are present in all materials formed in the protoplanetary disk. Therefore, these CAIs must have formed within the time span of cloud collapse.
Since the observed star accretion time span (1 million to 2 million years) is much longer than the time required for the formation of CAIs, the research team can accurately determine which stage in the formation of the solar system is recorded by the formation of CAIs, and what constitutes the solar system. How quickly the substance accretes. They finally concluded that the solar system was formed in about 200,000 years.
The lead author of the paper and LLNL cosmic chemist Greg Breneca said: "Before, we did not know how long the solar system took to form. Our latest research shows that the collapse of the solar system that led to the formation of the solar system took less than 200,000 years. Happened very quickly within a period of time."