Scientists for the first time have been able to pinpoint the source of an extremely powerful version of a neutrino, a ghostly particle that can travel virtually unimpeded through space. It's an achievement that opens a whole new way of looking at the universe. The neutrino was detected by a South Pole observatory called IceCube that was specifically designed to catch the particles. It consists of a cubic kilometer of ice festooned with more than 5,000 detectors. Neutrinos don't interact with much, but occasionally one will strike another particle, giving off a kind of light known as Cherenkov radiation that IceCube's detectors can pick up. When a particularly high-energy neutrino is captured, IceCube sends out an alert. "We had this neutrino alert...
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A 4 Billion Light-Year Journey Ends At The South Pole