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Did you know? There's a #telescope sitting more than a mile and a half under the Mediterranean Sea, where no sunlight can reach. In this inky darkness, the Kilometer Cubic Neutrino Telescope (#KM3NeT) waits for a #neutrino - a weakly interacting particle - to show up. And now one has shown up, in a big way. The KM3NeT collaboration said yesterday that its telescope has caught a neutrino with the highest energy observed so far, equal to 220 million billion electron volts. 🔭🌊Find out more about the undersea neutrino catcher:https://earthsky.org/space/highest-energy-neutrino-observed-undersea-telescope-km3net/📸 This is the optical module of the telescope KM3NeT. Image via KM3NeT.