A planet's radio signal may begin as a sharp tone (left, white) but can be spread out by the star'[s surroundings plasma winds into a wider, fainter signal (right, green). The study suggests we may be missing signals by mostly looking for the sharp white shape instead of the broader green one. (Vishal Gajjar via SWNS)
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Turbulent plasma near distant stars could blur ultra-narrow signals before they leave their home star systems - making them difficult to detect.
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