Why Conventional SETI Needs A Major Refocus
📖 Full Retelling
After decades of searching for alien signals in narrow radio and microwave bandwidths, a new paper suggests that we take a wholly different approach. The idea is to broaden the search to a much wider range of the electromagnetic spectrum.
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Why Conventional SETI Needs A Major Refocus By Bruce Dorminey - March 18, 2026 02:10 AM UTC | Astrobiology Conventional SETI (Search For Extraterrestrial Intelligence) strategies have long been built on the idea that intelligent extraterrestrials would aim to communicate with other intelligent civilizations along a very narrow band of the electromagnetic spectrum, preferably in the radio spectrum. The hypothesis is that any putative technological civilizations out there would use electromagnetic signaling for virtual meetings at a so-called galactic watering hole. That is, a band of radio-quiet frequencies extending from 1420 MHz to 1662 MHz, encompassing the spectral lines of hydrogen and hydroxyl , both of which can combine to form water. The idea of a cosmic electromagnetic watering hole makes for a powerful metaphor for potential galactic communication between advanced technological intelligences. If indeed such intelligence is out there. But in a new paper just accepted for publication by *The Astrophysical Journal*, Ben Zuckerman, the paper’s sole author and a long-time UCLA professor of physics and astronomy, argues instead that we should be searching via what he terms broadband SETI. That is, from the radio on up through the infrared and optical portions of the electromagnetic spectrum. Our principal assumption is that a purposely communicative technological civilization will do its technological best to establish communication with other ETI, writes Zuckerman. This opens the possibility for the serendipitous detection of an alien transmitter in electromagnetic sky surveys undertaken for reasons that have nothing to do with SETI, he writes. Thus, if a nearby extraterrestrial intelligence wants to communicate with other nearby terrestrial intelligence, then it can and will transmit signals that can be detected even by a civilization like ours, Zuckerman notes. That is, engaged in astronomical research that uses modest size telescopes, he writes. The Bad News?...
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