On February 13, 2023, an invisible particle passed through the Mediterranean Sea near Sicily. This subatomic particle, called a neutrino, collided with an atom about 3,450 meters below the ocean surface. The collision created a flash of blue light that was detected by a scientific instrument. Scientists calculated that the particle carried enormous energy, about 35 joules, packed into something incredibly tiny. It was the most powerful neutrino ever recorded, ten times stronger than anything detected before.
For more than three years, nobody knew where this particle came from. However, a new study published in March 2026 offers an answer. The researchers believe the neutrino came from blazars, which are supermassive black holes that shoot powerful jets of material almost directly toward Earth. The study was led by Meriem Bendahman from the Istituto Nazionale di Fisica Nucleare in Naples.
Bendahman's team did not search for a single source. Instead, they created a computer model to see if many blazars together could produce such powerful neutrinos. Their model showed that a population of blazars could explain the detection. The results suggest that conventional physics, without new exotic particles, can explain this mysterious event. The full detector, once completed, will help scientists see more of the sky and understand these cosmic monsters better.