Recently, scientists found 19 galaxies less the milky Way, in which the number of dark matter — the mysterious substance that makes up most of the Universe — much less than one would assume. Recall that the existence of invisible dark matter explains why galaxies rotate, collide and stick together, and not scatter in different directions. However, how exactly did these dwarf galaxies scientists can’t explain. The study, which was published in the journal Nature, Astronomy, astronomers, Chinese Academy of Sciences studied 324 of the galaxy, and also used the data obtained using the Arecibo radio telescope in Puerto Rico.
The higher the speed, the greater the mass of a galaxy
To determine the amount of dark matter in dwarf galaxies, the researchers estimate the mass of hydrogen and add the obtained results to the available mass of stars. In “normal” cases, only two percent of the galaxy consists of dark matter. Astronomers believe that a small amount of dark matter or the absence of detected galaxies may be a consequence of the fact that telescopes are not able to catch her signs. The researchers also noted that 14 of the 19 dwarf galaxies are in desolate corners of the Universe, not surrounded by neither nebulae nor star clusters.
Kyle Oman, an astrophysicist Durham University in England who was not involved in the study, believes that the discovered class of galaxies complicates our ability to explain the formation of a single system. The discovery means that galaxies can be formed 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 broken by larger galaxies. However, in some cases the dwarf galaxy was extremely isolated from other space objects.
Currently, physicists only understand that, which is slightly more than 15% of the observable Universe — the rest is considered dark matter. The theory of the existence of dark matter was first conceptualized in 1977, scientists who suggested that a material responsible for all the invisible stuff in space. It is worth to mention once again that the researchers really don’t know what dark matter is. But despite this, the European space Agency plans to launch a satellite Euclid, which will search for signals of the elusive and mysterious substance. The researchers also noted thatthis type of dark matter is too elusive to be detected in experiments, it can show its presence in astronomical observations. Anyway, in 2022, after the launch of the satellite Euclid, we learn more about the origin of dark matter.