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Some of the brightest and most energetic objects in the Universe are the mystery source of high-energy cosmic neutrinos, new research has confirmed. A comprehensive analysis has been convincing enough to link the galaxies that host the fiery cores known as blazars with these mysterious particles. It’s a result that provides a completely unexpected solution to a problem that has kept astrophysicists scratching their heads for years. “The results provide, for the first time, irrefutable observational evidence that the PeVatron blazar sub-sample is a source of extragalactic neutrinos and thus an accelerator of cosmic rays,” said astrophysicist Sara Buson of the Julius Maximilian University of Würzburg in Germany. Neutrinos are the odd little things at the best of times. These subatomic particles are ubiquitous and are among the most abundant in the Universe. However, their mass is almost zero, they are electrically neutral, and they interact very little with anything else in the universe

Cosmic rays consisting of electrically charged particles of high energy are constantly bombarding the Earth’s atmosphere. These particles come from deep space, they have traveled billions of light years. However, where did they come from? What shot them through the Universe with such incredible power? These questions have been one of the most significant challenges of astrophysics for more than a century. An international team of researchers led by the University of Würzburg and the University of Geneva (UNIGE) sheds light on one aspect of this mystery: neutrinos are thought to have been born in a blazar, the core of a galaxy that is fed by a supermassive black hole. Sara Buson has always considered it a significant task. In 2017, researchers and their colleagues introduced blazar (TXS 0506+056) as a potential neutrino source for the first time. The study sparked a scientific debate about whether there really is a link between blazars and high-energy neutrinos. After taking this