“Old Heart” Of The Milky Way
It is known that there are a few stars scattered around the center of the Milky Way, which are remnants of the old galactic core when it was still new.
However, what is new today is what scientists have identified about 18,000 stars that have existed since the beginning of the galaxy, through a team that used measurements from the most accurate three-dimensional map of the galaxy ever collected, in addition to a neural network to probe the chemical compositions of more than two million stars, according to the “Science Alert” website. Scientific.
A giant and interesting puzzle
The team, led by astronomer Hans Walter Rex of the Max Planck Institute for Astronomy, pointed out that it has greatly embodied the current picture by showing that there is indeed a tightly bound "iceberg" at the site, and its characteristics have been recognized before.
He also showed that the Milky Way's 13-billion-year history is a gigantic and interesting puzzle that needs to be reconstructed from the state of the galaxy today.
He asserted that groups of stars could be linked based on common features such as their motions and chemical compositions, a property known as metallicity. This is where the European Space Agency's Gaia Observatory comes into play.
Stars interconnected in a similar composition
It is noteworthy that the satellite was there, sharing the Earth's orbit around the sun for years, and carefully tracking the stars and taking measurements of their locations and three-dimensional movements within the galaxy.
In addition, Gaia takes measurements that allow estimates of the metallicity of stars.
While minerals can bind stars together, stars with a similar composition could have been born in the same place at the same time. But it can also tell us roughly how old the star is, because some elements didn't exist in the universe until there were stars around to form them.
Source: websites