Astronomers have detected a rare radio signal that originated about 3 billion years ago in a galaxy far, far away. And as one expert puts it, the source is "kind of perplexing." Fast radio bursts, millisecond-long pulses of radio emission from beyond our galaxy, were first discovered a decade ago. Since then, scientists have detected only 30 of them, generally believed to be caused by colliding black holes or other cataclysmic events, per Popular Science.
Repeating Signal From Deep Space Heard Again
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