Scientists recently discovered 19 smaller galaxiesThe Milky Way, in which the amount of dark matter - the mysterious substance that makes up most of the universe - is much less than you might expect. Recall that the existence of invisible dark matter explains why galaxies rotate, collide and stick together, rather than scatter in different directions. Nevertheless, how exactly these dwarf galaxies were formed, scientists can not explain. In a study published in the journal Nature Astronomy, a group of astronomers from the Chinese Academy of Sciences studied 324 galaxies and also used data obtained with the Arecibo radio telescope in Puerto Rico.
The higher the speed, the greater the mass of the galaxy
To determine the amount of dark matter indwarf galaxies, researchers estimate the mass of hydrogen and add the results to the mass of existing stars. In “normal” cases, only two percent of the galaxy is not made up of dark matter. Astronomers believe that a small amount of dark matter or its complete absence in the detected galaxies may be a result of the fact that telescopes cannot capture its signs. Researchers also note that 14 of the 19 dwarf galaxies are in the deserted corners of the universe, not surrounded by either nebulae or star clusters.
Kyle Oman, an astrophysicist from Durham University atEngland, who did not participate in the study, believes that the discovered class of galaxies makes it difficult for us to explain their formation as a single system. The discovery itself means that galaxies can form in different ways. According to one of the existing theories about the absence or small amount of dark matter in some galaxies, dark matter could be torn apart by larger galaxies. However, in some cases, dwarf galaxies were extremely isolated from other space objects.
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At present, physicists understand only that ofof which a little more than 15% of the observed Universe consists - the rest is considered dark matter. The theory of the existence of dark matter was first conceptualized in 1977 by scientists who suggested that some material is responsible for all invisible matter in space. It is worth mentioning once again that researchers do not really know what dark matter is. But, despite this, the European Space Agency is going to launch the Euclidean satellite, which will look for signals of elusive and mysterious substance. Researchers also note that although this type of dark matter is too elusive to be detected in experiments, it can show its presence in astronomical observations. One way or another, in 2022, after the launch of the Euclidean satellite, we learn more about the origin of dark matter.