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The Daily Galaxy
Among the unsolved mysteries confronting 21st century physics from gravitational waves to dark energy, neutrinos -the "ghosts of the cosmos"- are near the top of the list. These awesomely low-mass subatomic particles , less than a millionth of the mass of electrons, play a key role in weak interactions and come three flavors: electron, muon, and tau. Stars actively flood the universe with new neutrinos along with ancient particles created some two seconds after the Big Bang. CERN announced this week that a muon-type neutrino dispatched from the CERN research laboratory near Geneva had arrived as a tau neutrino at the INFN Gran Sasso Laboratory in Italy, 730 kilometres (450 miles) away.
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