For more than half a century, the search for extraterrestrial intelligence has been built ...

Just over 40 years ago, in his novel Contact, astronomer Carl Sagan imagined what it would be like to detect radio signals ...

If advanced aliens lived on a planet within a few hundred to a thousand light years away from Earth, then vast numbers of their signals must already have crossed Earth without being noticed, a new ...

Radio silence has long puzzled those searching for extraterrestrial intelligence, but the answer might lie much closer to the source of potential signals than previously thought. Conditions around ...

Astrophysicist Benjamin Zuckerman concludes that no alien civilization has passed within 100 light-years of Earth in billions of years, based on the absence of alien probes or strong, continuous ...

What steps can be taken to identify why we haven’t received radio signals from an extraterrestrial intelligence, also called technosignatures? This is what a recent study published in The ...

Aliens may have been trying to contact humans for years, suggests new research. But stellar “space weather” could mean radio signals from friendly extraterrestrial intelligence get lost in space, say ...

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In March 2026, SETI Institute researchers contributed to a wide range of conversations about our solar system and the search for life beyond Earth. From explaining unusual features on Mars and ...

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 ...