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The oldest satellite galaxy is over 13 billion years old



According to a recent report by the Physicist Organization Network, the latest research by British and American scientists shows that the darkest satellite galaxy orbiting the Milky Way is one of the oldest galaxies in the universe. They said that the discovery of these earliest galaxies equals the discovery of the remains of the earliest human beings on Earth, helping to study the evolution of the universe.

These galaxies include "Segue 1", "Bootes I", "Tucana II" and "Big Ursa 1", all of which belong to the first galaxy in the universe, more than 130 billion years of history.

About 380,000 years after the Big Bang, the first atom began to form. These hydrogen atoms aggregate into clouds and gradually cool off to form small lumps or "halations" of dark matter that occur in the Big Bang. This cooling phase, known as the Earth of the Universe, lasted approximately 1

00 million years. Eventually, the gas cooled in the halo became unstable and began to form stars, producing the first galaxies. With the formation of these galaxies, the universe emits light and the dark ages end.

In this latest study, scientists identified two groups of satellite galaxies orbiting the Milky Way. The first group is very weak, composed of galaxies formed in the dark ages of the universe, the second group is brighter, composed of galaxies formed hundreds of millions of years later.

The researchers stated that the intense ultraviolet radiation from the First Galaxies would destroy the remaining hydrogen atoms through ionization, making it difficult to cool to new stars. In the next billion years, the formation of the galaxy stopped. But as the halo of dark matter becomes so large that the ionized gas can cool off, the galaxy's formation re-opens and eventually forms a spectacular, bright galaxy like the Milky Way.

It is Noteworthy That the Team Found It The previously developed galaxy formation model was fully consistent with the data that made it possible to deduce the formation time of satellite galaxies.


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