The newly launched James Webb Space Telescope is expected to allow astronomers to explore the distant regions of the universe in search of its oldest stars. But the discovery by an international team could save them from having to search just yet. Researchers have just got their hands on stars with a very low – and therefore very old – metallic content there, on the outskirts of the Milky Way.
for us From’ . But it also contains some heavier elements. These heavy items – like , to where is the , generally referred to as -, the sun takes them from Who condenses it. Heavy items scattered there huge at the end of their lives. Generations of stars predated our sun. Hence measure what call her The star gives an idea of his age. The more metal, the smaller the star.It definitely consists of more than 98% of And’ . the
However, an international team led by A (CNRS) has just been updated, in the heart of A group of stars whose metallicity appears to be very low. About 2500 times weaker than our sun. And much less than those measured in other structures elsewhere in the universe.
In fact, this group of stars is not quite in our heart. Even on the side of its surroundings. on the south side. And these stars travel on a which range from 20,000 to 90,000 from the middle . Although this stellar stream, which the researchers named C-19, is about 30 times as wide It is invisible in our sky when Not.
Rewrite the history of the formation of stars and galaxies?
His discovery shakes up the current models of , Dr’ . Because until then, astronomers had not even thought about the possibility of such structures, consisting only of stars with a low metallic content. At best, imagine that they would all have gone away from our universe. C – 19, and its stars with a mineral content of less than 0.05% of the Sun, on the contrary, the first constituent elements of the Milky Way formed in mineral-poor environments.
While astronomers used to study distant galaxies to get close to some ancient stars – due to the time it takes for their light to reach Earth – they can now consider studying ancient structures as well. But closer to us. A little as if it was a new oneIt just opened into the first sequences of star formation in our universe.