The search for extraterrestrial intelligence (SETI) is a multidisciplinary research area focused on detecting evidence of technologically advanced civilizations beyond Earth, primarily through their electromagnetic emissions or technosignatures. It integrates radio astronomy, signal processing, astrophysics, planetary science, and increasingly machine learning to monitor and analyze vast bandwidths of the sky for narrowband, pulsed, or otherwise non-natural signals. Research addresses detection algorithms, interference mitigation, instrument calibration, and statistical frameworks for evaluating candidate signals. Modern SETI also explores non-radio channels, including optical or infrared beacons and other engineered signatures, and develops quantitative strategies for survey design, target selection, and constraints on the prevalence of technological life.
Searching for extraterrestrial intelligence has so far primarily meant focusing on one particular type of signal—and that signal has normally been based on our own current cutting-edge technology. But what if that's the wrong ...
Space Exploration
Jul 27, 2026
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One of the challenges of searching for technosignatures (i.e., signs that intelligent life somewhere in the universe has created technology) is understanding what to look for. Technology is a very broad area, and different ...
Astronomy
Jul 27, 2026
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Astronomers searching for signs of extraterrestrial intelligence may have been missing alien signals in part of the radio spectrum that has not recently been explored.
Astronomy
Jul 23, 2026
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Astrobiology has long been split into two camps: a search for "biosignatures" and a search for "intelligence." These look for very different things, but they also leave a huge gap in between. It took 3.5 billion years for ...
Astrobiology
Jul 14, 2026
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Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets. Things mistaken for UFOs.
Astronomy
Jul 7, 2026
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With new technologies come new opportunities. And that is especially true in astronomy—with every new advanced telescope, we have the potential to see (or in some cases, listen) farther and more clearly than ever before. ...
Astronomy
Jul 6, 2026
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Artificial intelligence (AI) is continuing to have a disruptive impact on ever more parts of humanity. But what does it mean in the long run? A new paper, available as a preprint on arXiv from Austrian researcher Sergey Ivliev, ...
Astrobiology
Jun 29, 2026
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Current plans for flagship telescopes in the 2040s are focused on answering a simple question: Are we alone? Our best telescopes to date, such as the James Webb Space Telescope (JWST), have given us only tantalizing glimpses ...
Planetary Sciences
Jun 22, 2026
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An interstellar comet that blazed past the sun last year could be nearly three times older than our solar system and is unlike anything ever seen before in our cosmic backyard, astronomers said Monday.
Planetary Sciences
Jun 22, 2026
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The group leading the charge in the search for extraterrestrial life has given the all clear: An interstellar comet looks to be completely natural and free of any alien tech.
Planetary Sciences
Jun 20, 2026
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