Dark matter may be more vibrant than previously thought, UC Riverside study reports. Thought to make up 85% of matter in the universe, dark matter is nonluminous and its nature is not well understood

The self-interacting dark matter (SIDM) theory suggests that dark matter particles interact with each other through a dark force. This theory may resolve inconsistencies in dark matter densities observed in different galaxies. 

Dark matter is unaffected by radiation, so its density perturbations can grow first. If there were only ordinary matter in the universe, there would not have been enough time for density perturbations to grow into the galaxies and clusters currently seen. 

According to Space.com, the theory may also explain the extreme densities seen in dark matter haloes surrounding galaxies.

If there were only ordinary matter in the universe, there would not have been enough time for density perturbations to grow into the galaxies and clusters currently seen. Dark matter provides a solution to this problem because it is unaffected by radiation. Therefore, its density perturbations can grow first.

Dark matter is an invisible form of matter that astronomers believe is responsible for the gravitational effects observed in galaxies and galactic clusters. 

Dark matter is thought to have played a key role in the formation of galaxies. Without dark matter, galaxies, stars, planets, and life would not exist. Dark matter’s gravitational pull attracts ordinary matter, which leads to the formation of galaxies. 

Dark matter’s properties also affect how the universe evolves. For example, dark matter affects how galaxies form and grow, and how they clump together to form the cosmic web. 

Astronomers can’t see dark matter, but they can detect its influence by observing how its gravity bends and distorts light from more-distant objects. This phenomenon is called gravitational lensing.

Dark matter plays a major role as it provides the gravitational force to pull the elements of the universe such as helium and hydrogen together in the formation of stars. It can draw other matter in the universe towards it and holds entire galaxies due to gravitational force.

Dark matter helps create structures in space by providing the gravitational force that pulls elements of the universe together. This force allows compact structures to form without being opposed by other forces, such as radiation pressure

Dark matter’s gravity also drives normal matter, like gas and dust, to collect and build up into stars, galaxies, and galaxy clusters. Dark matter makes up about 30% of the universe’s total mass and is responsible for the way galaxies are organized on large scales. 

Dark matter also provides the extra gravity that keeps stars from swirling out into space. According to cosmologists, galaxies are rotating so rapidly that without dark matter, they would have been torn apart long ago

Hubble Detects Smallest Known Dark Matter ClumpsUsing NASA’s Hubble Space Telescope and a new observing technique, astronomers have found that dark matter forms much smaller clumps than previously known. This result confirms one of the fundamental predictions of the widely accepted “cold dark matter” theory.

Yes, NASA has found dark matter: 

• Hubble Space Telescope In 2023, astronomers used the Hubble Space Telescope to discover a ring of dark matter that formed during a collision between two galaxy clusters. They also used the telescope to find smaller clumps of dark matter than previously known. 
• Chandra X-ray Observatory Astronomers used the Chandra X-ray Observatory to measure the distribution of dark matter in a cluster of galaxies called Abell 2029. 

NASA’s Hubble Deep Field images and GOODS program observations have also provided evidence that the universe is primarily made of dark matter. 

Dark matter is invisible and doesn’t emit light. However, its gravitational pull on visible matter can be detected. Scientists infer the existence of dark matter based on its gravitational pull on regular matter.

According to a UC Riverside study, dark matter may be more complex and vibrant than previously thought. Dark matter is thought to make up 85% of the universe’s matter, but its nature is not well understood. 

Here are some other facts about dark matter: 

• Dark matter accounts for five times as much of the universe as ordinary matter. 
• Dark matter only interacts with ordinary matter through gravity. 
• Dark matter is thought to be lighter and “warmer” than previously assumed. 
• Dark matter seems to interact even less often with regular matter than previously thought. 
• Dark matter has been observed around many distant clusters, including Abell 1689

Self-interacting dark matter (SIDM) is a theory that may resolve inconsistencies in dark matter densities observed in different galaxies. SIDM proposes that dark matter particles interact with each other through a new dark force. 

SIDM challenges the traditional cold dark matter (CDM) model and highlights the dynamic nature of dark matter. Both theories explain how the overall structure of the universe emerges, but they predict different dark matter distributions in the inner regions of a galaxy. 

According to Mike Boylan-Kolchin, one of the biggest pieces of evidence of self-interactions would be the density profiles of the centers of galaxies. 

Another theory that tries to explain galactic rotation curves better than Cold Dark Matter theories is Superfluid Dark Matter. The idea behind this theory is that galaxies have dark matter in a superfluid state, similar to liquid helium

(Ful article source google)

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