‘Ghost Particle’ That Smashed Into Earth Breaks Records

In February 2023, a detector called KM3NeT, located deep under the Mediterranean Sea, picked up a signal that seemed to indicate a neutrino with a record-shattering energy of 220 petaelectronvolts (PeV). For reference, the previous record was a mere 10 PeV. Now, an exhaustive analysis of all the data on and around the event, designated KM3-230213A, not only supports the conclusions that the signal was caused by a 220-PeV neutrino, but adds to the mystery about where the heck in the Universe it came from.”The patterns of light detected for KM3-230213A show a clear match to what is expected from a relativistic particle crossing the detector, most likely a muon, ruling out the possibility of a glitch,” the KM3NeT Collaboration told ScienceAlert. “Thanks to the reconstructed energy and direction of this muon, the most likely scenario by far is that the muon originated in the interaction of an astrophysical neutrino in proximity to the detector, making it the most natural explanation.”

The scientists believe that it’s very, very unlikely that the neutrino originated within the Milky Way galaxy. Work is underway to come closer to tracing its origin point. “KM3-230213A opened a new window on ultra-high-energy neutrino astronomy,” the Collaboration said. “Our analysis is the first effort to combine the observations of multiple telescopes over a wide energy range to characterize the ultra-high-energy spectrum. This represents our best chance to gain knowledge on the most extreme objects that populate our Universe.”

The research has been published in the journal Physical Review X.