Mysterious repeating radio signals have reached Earth from a galaxy 1.5 billion light years away (but are they evidence of alien civilisations?)
Mysterious repeating energy bursts have been detected for only the second time.
Fast radio bursts, or FRBs, are radio emissions that appear temporarily and randomly, making them not only hard to find, but also hard to study.
The latest signals to be detected reached Earth from a galaxy 1.5 billion light years away.
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