<ul><li>A detector on the sea floor off the coast of Italy has observed the first ultra-high energy neutrino.</li><li>The neutrino, named KM3-230213A, had an energy of 220 petaelectronvolts, making it the most energetic neutrino ever observed.</li><li>The detector, KM3NeT, was able to determine the neutrino's presence by detecting the muon it created.</li><li>The discovery opens new possibilities in neutrino astronomy, allowing the exploration of extreme astrophysical phenomena.</li></ul>

Detector on sea floor spots highest energy neutrino

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