Shortly after its birth, the universe wasfilled with gas, mainly hydrogen. Over time, gravity attracted gas to the clouds, which turned into galaxies and in which stars were lit. Explosions of supernovae pushed gas out of galaxies, and in intergalactic space it cooled and became denser, after which gravity again pulled gas back into the galaxy. As a result of these processes, new stars formed. It is believed that this process repeats over and over, but over time, the processed gas ends in any galaxy, new stars do not form and the galaxy dies. But recently, scientists have discovered something strange - something is killing galaxies in remote regions of the universe.
Why do galaxies die?
Astronomers have only recently learned about naturallife cycle of galaxies. Their destruction, meanwhile, is a big mystery to researchers. According to The Conversation, a group of researchers decided to understand exactly how and why the death of distant galaxies occurs. Note that astronomers used the term “killing” to describe the halt of star formation in galaxies.
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Star formation is complex and still notfully studied process, although scientists know that it depends on where the galaxies are located, how they interact with the environment and the intergalactic environment around them. However, the exact details of how the environment can simultaneously stimulate life and dictate death remain unknown. To get closer to the answer, the researchers turned their eyes to galactic clusters - superclusters of galaxies that contain from hundreds to thousands of galaxies. With such a huge mass, a group of galaxies sweeps through the universe at a speed of 1600 km per second. In addition, the plasma between galaxies is heated to such high temperatures that it emits X-rays.
The heat-intergalactic environment is hotrarefied plasma, which is believed by cosmologists, exists in the spaces between galaxies and contains from 40 to 50% of baryonic matter in the form of plasma, atoms and molecules.
Experts believe that as a result of heatinggalactic plasmas interact with each other more often, as a result of which gas is displaced from galaxies. And since no stars are formed without gas, the galaxy is rapidly approaching death. In addition, the heat caused by the speed of the intergalactic cluster across the expanses of the Universe means that the gas cannot cool down to become particles used to create stars or galaxies.
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To dot all and a group of scientistshopes to find out if one of the above two reasons is the true cause of the destruction of galaxies. In the course of their work, researchers observe the supercluster of galaxies in the Virgo constellation using the ALMA telescope, which is located at an altitude of 5000 meters in the Atacama Desert in northern Chile. Astronomers hope to create high-resolution molecular hydrogen maps for 51 galaxies, since hydrogen is often regarded as the main building block in space and is the most common star formation fuel.
As a result of this work, researchers will be able toto understand how galaxies develop, live and die in the most dense and extreme regions of our mysterious Universe. Well, we will look forward to the results.