Scientists have said that the stars scattered in the center of the Milky Way are the remnants of an old galactic core that existed when our galaxy was still young.. Using the most accurate 3D map of our galaxy and a neural network that analyzed the composition of stars, the researchers studied more than two million stars.. As a result, they identified a group of 18 thousand stars that existed in the "

The age of the Milky Way is estimated at 13 billion years, and reconstructing the history of its evolution is not an easy task.. Stars can be related to each other based on common features such as motion or chemical composition (metallicity). The Gaia space observatory can help in determining them..

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It tracks stars, monitors changes in their position and movement in the galaxy.. In addition, Gaia makes it possible to determine their metallicity. This is important because stars with similar compositions could have been born in the same place and at the same time.. In addition, metallicity can indicate the age of a star, since some elements simply did not exist in the universe at a certain period..

The primordial universe consisted mainly of hydrogen with a small amount of helium. When the first stars appeared in it, heavier elements began to appear in their cores, up to iron.. When the luminaries die, they explode, throwing chemical elements into space.. And then new stars are formed from them..

The later a star forms, the more metals it contains.. That is, a higher metallicity is inherent in younger stars.. The orbits of stars differ as they move around the center of the galaxy..

If you can find stars with a similar composition that move in similar orbits, it is reasonable to assume that they have existed together for a long time..

During the study, scientists studied two million stars. As a result, they found a population of luminaries of the same age and similar orbits, which suggests that they were present before the Milky Way "

Scientists have called them the " According to the researchers, this population is the remains of protogalaxies.

Previously, scientists were able to confirm that the galaxies recently discovered by the James Webb telescope are the most distant and oldest known at the moment.. They formed 13.4 billion years ago, just a few hundred million years after the Big Bang..