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Impossible Matter Found in Nearby Galaxy

The authors of a new study published in The Astrophysical Journal Letters believe that the galaxy neighboring the Milky Way consists of a hypothetical form of dark matter, the particles of which can interact with each other. But this contradicts the basic cosmological model that explains the nature of the Universe.

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Orbiting the Milky Way about 380,000 light-years away is its fourth-largest satellite galaxy, Crater 2. It is approximately 6,500 light-years in diameter and consists of several billion old stars.

In recent years, astronomers have been trying to figure out exactly what properties this dwarf galaxy has that allows it to maintain its structure and relatively large size. It is known that the evolution of the Crater 2 galaxy over thousands of years is influenced by the gravity of the Milky Way.

It also influences the dark matter halo surrounding the galaxy and its stars. According to scientists, the gravitational influence of our galaxy can remove both dark matter and stars from its neighbor, which will reduce the mass of the galaxy over time.

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The study authors found that the gravitational influence of the Milky Way is too weak to explain the density of dark matter in Crater 2 if it consists of cold dark matter particles, reports Space.

Dark matter is the invisible part of the Universe and makes up more than 80% of its mass. It is believed that thanks to dark matter, all galaxies can be held together as a single whole. But no one has yet seen dark matter directly.

Dark matter is the invisible part of the Universe and makes up more than 80% of its mass. It is believed that thanks to dark matter, all galaxies can be held together as a single whole. But no one has yet seen dark matter directly.

The main cosmological model called the Lambda-CDM Model, which explains the nature of the Universe, tells us about the existence of cold dark matter, the particles of which cannot interact with each other.

At the same time, there is a theory that suggests that dark matter may consist of self-interacting particles. These particles interact with each other using an as-yet unknown force that goes beyond gravity.

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Scientists believe that exactly this kind of dark matter exists in the Crater 2 galaxy, because, among other things, the gravity of the Milky Way should have reduced its mass much more strongly, which is not observed. The simulations show a surprisingly large agreement between the theory of self-interacting dark matter and observations of the Crater 2 galaxy.

According to scientists, in this dwarf galaxy, despite the predictions of the Lambda-CDM Model, there is no bulge of dense dark matter that is directed from the halo closer to the center of the galaxy.

This can again be explained by the fact that dark energy particles transfer energy between themselves during collisions and this means that the dark matter halo is aligned around the galaxy.

According to the self-interacting dark matter theory, the galaxy is likely to grow inside a dark matter halo and this explains the size of Crater 2 better than the Lambda-CDM Model.

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Scientists have concluded that the properties of the Crater 2 galaxy challenge the main cosmological model and it may indeed consist of dark matter particles that collide with each other, although this contradicts modern ideas about the mysterious substance.

Now the authors of the study want to find other galaxies similar to Crater 2, where the same properties can be observed.

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Jake Carter

Jake Carter is a researcher and a prolific writer who has been fascinated by science and the unexplained since childhood. He is always eager to share his findings and insights with the readers of anomalien.com, a website he created in 2013.