Researchers from the University of California found out that the dark matter, believed to mysterious and exotic, is not very different from subatomic particles known to science since the 1930s. They are similar to pions, which bind atomic nuclei together. they said.
Dark matter makes up 85% of the mass of the universe and unlike stars and galaxies, it never gives off radiation, making it impossible to observe directly.
However, after examining 72 collisions between clusters of galaxies, using the Hubble Space Telescope, the Chandra Observatory, dark matter’s gravitational influence was able to give away clues to study it.
Researchers found that dark matter passed directly through one another without interacting and stars had little interaction with each other, as they traveled through mostly empty space while gsclouds remained static.
“We have seen this kind of particle before. It has the same properties – same type of mass, the same type of interactions, in the same type of theory of strong interactions that gave forth the ordinary pions. It is incredibly exciting that we may finally understand why we came to exist,” said Hitoshi Murayama, professor of physics at the University of California, Berkeley, whose findings appeared in the journal Physical Review Letters.
Dark matter is the substance behind keeping galaxies, stars intact, but human eye cannot observe it. In the past, observations of the Bullet Cluster or a collision between a pair of large galaxy clusters, showed the evidence of dark matter and suggested it has few interactions.
The new theory said that the dark matter interacts with itself within galaxies, which is believed to resolve the most mysterious nature about the dark matter. “It can resolve outstanding discrepancies between data and computer simulations,” said Eric Kuflik, a postdoctoral researcher at Cornell University.