The MAGIC telescopes detected gamma rays with energies of 250 gigaelectronvolts from the RS Ophiuchi nova, a hundred billion times more energetic than visible light. This suggests that nova outbursts are a source of cosmic rays, specifically accelerated protons and nuclei of hydrogen atoms.
The KATRIN experiment has achieved a new upper limit on neutrino mass of 0.8 eV, entering the cosmologically and particle-physically important sub-eV mass range. This is the first time that a direct neutrino mass experiment has reached this sensitivity.
The study confirms that the speed of light is constant in vacuum, as predicted by Einstein's general relativity theory. No energy-dependent time delay was detected in the arrival times of gamma rays from a high-energy gamma-ray burst, supporting GR. Strong constraints on the quantum gravity energy scale were also set.
The MAGIC telescopes detected the first-ever TeV photons from a gamma-ray burst, providing critical new insights into the physical processes at work in these cosmic events. The discovery sheds light on the mysteries surrounding gamma-ray bursts and their energetic emissions.
Astrophysicists have localized a high-energy cosmic neutrino originating outside the Milky Way to a blazar in the Orion constellation using MAGIC telescopes and IceCube detector. The observation provides insight into the origin of cosmic rays, which are believed to be accelerated by protons in the blazar's jets.