Scientists detect ghostly neutrinos from a distant galaxy, ushering in a new era of astronomy. A neutrino — a subatomic particle so tiny and difficult to detect that it is nicknamed a “ghost particle” — has been traced to its origin in a distant galaxy 4 billion years ago.

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Scientists detect ghostly neutrinos from a distant galaxy, ushering in a new era of astronomy. A neutrino — a subatomic particle so tiny and difficult to detect that it is nicknamed a “ghost particle” — has been traced to its origin in a distant galaxy 4 billion years ago.