Scientists discover that the four oldest galaxies reveal the evolution of the universe – Science Exploration – cnBeta.COM



According to the "Daily Mail" reported on August 17, Beijing, the four small galaxies that run around the Milky Way are probably the oldest galaxies in the universe. According to astronomers, the history of these galaxies dates back to 13 billion years ago, and they existed shortly after the Big Bang. These four small galaxies are "tied" together with the Milky Way by gravity – similar to the relationship between the moon and the earth, but their scale is much larger.

Computer simulations of four satellite galaxies around the Milky Way

found that their researchers would find their meaning to be compared to "finding the remains of the first people living on earth".

According to researchers from the Institute of Computational Cosmology and the Harvard-Smithsonian Center for Astrophysics at Durham University, this discovery gives us a new understanding of the evolution of the universe.

These galaxies, known as Segue-1, Bootes I, Tucana II and Ursa Major I, are very weak and are considered one of the first formed galaxies.

Professor Carlos Frenk, director of the Institute of Computational Cosmology at Durham University, said: "The importance of finding the first galaxy that was formed for the first time in our universe is equivalent to finding the first place to to live on earth It is really exciting to approve the remains of human beings. "

The first batch of atoms was born about 380,000 years after the Big Bang.

Being hydrogen atoms and hydrogen is the simplest element in the periodic table.

When they concentrated in the clouds and began to cool down, they gradually fell into the dark matter "halo" that emerged from the big bang.

This cooling-off phase, known as the "age of the universe", lasted about 100 million years.

The researchers said that the discovery of these four satellite systems gave us a new understanding of the evolution of the universe

Eventually, the halo-cooled gas became unstable and began to form stars.

These celestial bodies are the first galaxies ever formed and illuminate the universe – the end of the dark ages of the universe.

This study, published in the Journal of Astrophysics, found a cluster of galaxies that were very weak in the "dark ages of the universe."

It also found a second galaxy with a slightly higher brightness formed hundreds of millions of years later.

Hydrogen ionized by intense ultraviolet radiation from the first stars can cool to form a darker halo with a larger mass.

It is worth noting that the team discovered that the model for the formation of the galaxy that they developed earlier was identical to the observed data.

This allowed them to deduce the formation time of satellite systems.

Professor Flenk said: "Our findings support our current model of cosmic evolution."

Intense ultraviolet radiation from the first galaxies, destruction of the remaining hydrogen atoms by ionization – knockout Their electrons make it difficult to cool this gas and form new stars.

In the next billion years the formation of galaxies stopped and no new galaxies could be formed.

Eventually the halo of dark matter becomes very large and even the ionized gas can cool down.

The formation of the galaxy began to recover – and eventually formed a spectacular, clear galaxy like the Milky Way.


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