Radio astronomy

An artist's impression of the exoplanet K2-18b, a world larger than Earth orbiting a red dwarf and being studied in search of possible signs of life or technological signatures.

K2-18b Scanned for Alien Signals – But No Technological Signature Found

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SETI researchers used the VLA and MeerKAT telescope to search for narrow radio signals from the intriguing exoplanet. None survived the noise filters, but the method will be used in future searches
A record-breaking radio burst from the Sun in August 2025 came from a structure in the Sun's atmosphere called a helmet stream. This image, taken during the total solar eclipse on August 21, 2017, shows the classic V-shape of a large helmet stream. Credit: Miloslav Druckmüller, Peter Aniol, Shadia Habbal/NASA Goddard, Joy Ng

NASA detected a solar radio burst that lasted 19 days

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An unusual radio signal from the sun has lasted for 19 days, far beyond the normal duration of such bursts. NASA has linked the event to a giant magnetic structure in the sun's atmosphere, and it could help improve predictions
Illustration of the Drake equation. (Credit : NOIRLab/AURA/NSF/P. Marenfeld)

How long do technological civilizations last? Iranian researchers suggest a ceiling of about 5,000 years

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A mathematical analysis of the Fermi Paradox suggests that if intelligent life is widespread in the galaxy, the fact that we have not detected any signals from it may indicate that most technological civilizations do not survive more than a few thousand years.
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