Researchers have found a star with such a small mass.
The scientists took the power of the word: in our Galaxy they found something very ancient and mysterious.
Recently, researchers from the Monash University in Australia found themselves in the ancient galaxy of the Milky Way. It is 13.5 billion years old. Scientists named the discovery of 2MASS J18082002-5104378 B.
It turned out that it remained unnoticed due to the small size and dull space. To see the star star only succeeded thanks to her bright larger neighbor. In addition, scientists have discovered its age through a detailed spectral analysis.
The fact that the first generation of stars formed after the Big Bang consisted of light elements such as hydrogen, helium and lit. Then they gradually increased the number of metals. So the "metallicity" of the stars was a good indicator for determining their age.
According to the researchers, 2MASS J18082002-5104378 B refers to the second generation of stars. Check that its mass constitutes only 10% of the mass of the Sun, and the amount of metals contained in it is 10% of all metals in our planet.
Astrophysicist Andrew Casey admitted that for the first time he discovered a star with such a small mass and small amounts of metals. There is also the supposition that there may be other ancient stars in our galaxy, but they will not be easily detected due to their small size.
"These stars are extremely rare – the process of finding them like finding needles in a haystack, but because of the huge amount of data collected by terrestrial and space telescopes, we are more than ever close to understanding how stars originated in the early universe," Casey said.
This discovery gives the opportunity to learn the formation of stars in the universe. Because one of the oldest stars is in the thin disc of the Milky Way, the age of our galaxy has opened again. Perhaps it is much older than previously thought.