A dynamic spectrogram displaying an anomalous radio signal detected by a radio telescope. The bright white vertical line against the blue background represents the signal, its origin currently debated – potentially extraterrestrial, but more likely a terrestrial source like GPS satellite modulation. The vertical axis shows time, the horizontal axis shows frequency. The image showcases the ongoing search for extraterrestrial intelligence (SETI) and the challenges of identifying unusual signals from space.
Astronomy Picture from 06/02/2011
An Anomalous SETI Signal
Source: https://apod.nasa.gov/apod/ap110206.html
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