The concept of evolution, change and adaptation to new conditions turned out to be fair for objects such as stars. Recently, astronomers identified relatively close to the Earth of the star, which serves as an example of the earliest space bodies, the actual, the “first -born” of the large explosion. And this indirectly hints that we live in a very ancient and mysterious corner of space.
After about 180 million. years after the big explosion, the first stars were formed, which consisted of the lightest elements: hydrogen, helium and a bit of lithium. Over time, nuclear synthesis gave rise to heavier elements in them, the stars exploded, the new substance spread further through the universe, stars were formed from it, but with a different composition of the nuclei, which also ripened before the explosion and so on. By what the concentration of heavy metals as part of a star substance, astronomers today are divided into generations with sufficient accuracy and determine their age.
It was believed that all the ancient stars naturally disappeared, burned out, but in recent years with the advent of tools of greater accuracy, scientists began to find them one after another. 25 stars with the mass of the sun are already known, but the ultra -low content of heavy metals, which distinguishes them against the general background. The latter find, object 2mass J18082002-5104378 B, seven times lighter than the sun and has a record small concentration of metals. This indicates that this star is the first, maximum second generation.
To understand the uniqueness of the find, our native Sun belongs to 100,000 generation, and the metal in it cannot be counted as much, by mass more than 14 Jupiters. Immediately very light, just a “air” star, which still has not exploded in all these billions of years. And what else is intriguing, it is in the Milky Way, directly on the “thin disk”, which gives an occasion to revise both the age and the history of the origin of our galaxy.
Source — Monash University