No Mirror Universe? Colliding Galaxies Demystify Dark Matter, New Perspective
This is an exciting news for astronomers and space enthusiasts across the world. A latest study has found that the dark matter may not be part of a “dark sector” of particles as was earlier thought. This is going to completely change the perception about the dark matter.
Earlier almost every physicists across the world was near unanimous that the dark matter was actually part of a “dark sector” of particles. The latest conclusion has been reached by well-known scientists who have been working on collisions of galaxy clusters.
Galaxies are mystery for many space enthusiasts. They are so much far away from our earth that we donâ€™t have means to claim anything about them conclusively. Many of the claims that are being made now, may look like without much of basis in future. Nonetheless it is sure that we have better means to study them now compared to anytime in the past.
Researchers who are working on the project say that after the collision of the clusters of galaxies, the hot gas that fills the space between the stars in those galaxies also collides and splatters in all directions with a motion akin to splashes of water. Around 90 percent of the matter in galaxy clusters is made of dark matter but the question is does it splatter like water as well?
Researchers who are studying this aspect have found that dark matter does not splatter when clusters of galaxies collide, and this finding limits the kinds of particles that can make up dark matter. Specifically, the authors of the new research say it is unlikely that dark matter is part of an entire “dark sector. Our Milky Way galaxy is made up of hundreds of billions of stars, and there are hundreds of billions of galaxies in the observable universe. The space between the stars and the galaxies is filled with a lot of gas and dust. But all of those stars, galaxies, gas and dust make up only about 10 to 15 percent of the matter in the universe.
One of the researchers in the study David Harvey says, â€œGalaxy cluster mergers are incredibly messy. You’ve got the stars, the highest densities of dark matter and hot gas all swirling togetherâ€.