For 21 years, millions of volunteers let UC Berkeley use their home computers to search the sky for alien signals, producing 12 billion detections — after a decade of filtering, scientists narrowed them to roughly 100 targets worth a second look.

For 21 years, millions of volunteers let UC Berkeley use their home computers to search the sky for alien signals, producing 12 billion detections. After a decade of filtering, scientists narrowed them to roughly 100 targets worth a second look.

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