85% of our Universe is made out of dark matter and Phys.org says that we don’t exactly know what this is.
According to the official website, there’s a brand new study from the University of Michigan, Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California, Berkeley that has ruled out dark matter is responsible for mysterious electromagnetic signals that have been previously observed from nearby galaxies.
Before this work, there was a lot of hope that the signals could be giving experts evidence to help find dark matter.
It’s been revealed that dark matter cannot be observed directly because this does not absorb, reflect or emit light, but experts do know that it exists due to the effect that it has on other matter.
Dark matter can explain gravitational forces that are holding the galaxies together for instance.
Sterile neutrinos and dark matter
It’s been also revealed that experts suggest that dark matter is close to a related cousin of the neutrino, as Phys.org notes, called a sterile neutrino.
These are subatomic particles that are released during nuclear reactions that are taking place in the sun.
“They have a tiny amount of mass, but this mass isn’t explained by the Standard Model of Particle Physics. Physicists suggest that the sterile neutrino, a hypothetical particle, could account for this mass and also be dark matter,” according to the website.
Experts could detect the sterile neutrino due to the fact that it’s unstable, according to the co-author of the study, Ben Safadi.
The website mentioned above notes that there’s a meta-analysis of raw data that’s been taken by the XMM-Newton space X-ray telescope of objects in the Milky Way over 20 years that didn’t find any evidence that the sterile neutrino is what comprises dark matter.
Check out the original article in order to find out more data.