![Geometry of the LTT 3780 planetary system at the time of our radio technosignature observations. The left panel shows the sky-plane (X–Y) view as seen from Earth, while the right panel shows the top-down (X–Z) view of the system. The orbits of planets b (blue) and c (green) are shown relative to the host star (yellow). Our observations from the ATA, mentioned in Table 1 on 5th November 2025, were timed to coincide with a planet–planet occultation (PPO), when planet b passes behind planet c along the line of sight, providing a unique configuration to search for radio technosignatures during mutual planetary alignment.-- [astro-ph.IM]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/A-Search-For.png?resize=1200%2C719&ssl=1)
[astro-ph.IM] The LTT3780 system hosts two known exoplanets-LTT3780b, a rocky super-Earth, and LTT3780c, a temperate sub-Neptune-orbiting a nearby M dwarf on opposite sides of the radius valley. LTT3780c has been […]
Allen Telescope Array
Posted inAstrochemistry, Astronomy & Telescopes, Biosignatures & Paleobiology, Comets and Asteroids, Imaging & Spectroscopy, Intelligence & Language, Interstellar, Press Release, SETI & Technosignatures
SETI Institute Looks for Signs of Technology in Interstellar Visitor 3I/ATLAS
Scientists at the SETI Institute searched for technological signals from 3I/ATLAS, the third interstellar object observed in our Solar System.
Posted inAstrochemistry, Astrogeology, Astronomy & Telescopes, Comets and Asteroids, Imaging & Spectroscopy, Interstellar, SETI & Technosignatures, Status Report
A Search For Radio Technosignatures From Interstellar Object 3I/ATLAS With The Allen Telescope Array
In 2025 July, the third-ever interstellar object, 3I/ATLAS, was discovered on its ingress into the Solar System. Similar to the NASA Voyager missions sent in 1977, science probes by extraterrestrial […]
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Comets and Asteroids, Icy Worlds, Imaging & Spectroscopy, Intelligence & Language, Interstellar, SETI & Technosignatures, Status Report
Breakthrough Listen Observations Of Interstellar Object 3I/ATLAS
The interstellar object 3I/ATLAS was discovered on July 1, 2025. There is currently no evidence to suggest that it is anything other than a natural astrophysical object. However, given the […]
Posted inAstrobiology (general), Astronomy & Telescopes, People Of Astrobiology, Press Release, SETI & Technosignatures
Jill Tarter to Receive Inaugural Tarter Award for Innovation in the Search for Life Beyond Earth
Renowned astronomer, Dr. Jill Tarter (@jilltarter ), SETI Institute co-founder and pioneering SETI researcher, will be honored with the inaugural Tarter Award for Innovation in the Search for Life Beyond […]
Posted inAstronomy & Telescopes, Intelligence & Language, Press Release, SETI & Technosignatures, TRAPPIST-1
Are Nearby TRAPPIST-1 Planets Sending Radio Signals To Each Other?
A new technique allows astronomers to home in on planets beyond our solar system that are in line with each other and with Earth to search for radio signals similar, […]
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Press Release, SETI & Technosignatures, TRAPPIST-1
Scientists Use Allen Telescope Array to Search for Radio Signals in the TRAPPIST-1 Star System
Scientists at the SETI Institute and partners from Penn State University used the Allen Telescope Array (ATA) to search for signs of alien technology in the TRAPPIST-1 star system. The […]
Posted inAstronomy & Telescopes, Biosignatures & Paleobiology, Intelligence & Language, SETI & Technosignatures, Status Report, TRAPPIST-1
A Radio Technosignature Search Of TRAPPIST-1 With The Allen Telescope Array
Planet-planet occultations (PPOs) occur when one exoplanet occults another exoplanet in the same system as seen from the Earth’s vantage point. PPOs may provide a unique opportunity to observe radio […]
Posted inAstrobiology (general), Astronomy & Telescopes, Biosignatures & Paleobiology, Career Opportunities, Press Release, SETI & Technosignatures
SETI Institute Launches Groundbreaking Technosignature Science and Technology
The SETI Institute is announcing the launch of a pioneering grants program dedicated to advancing technosignature science. This first-of-its-kind initiative aims to support innovative research addressing critical observational, theoretical, and […]
Posted inAstronomy & Telescopes, Press Release, SETI & Technosignatures
First Coordinated Green Bank Telescope/Allen Telescope Array Observes Possible Source of the WOW! Signal
In May 2022, the International Journal of Astrobiology published a paper suggesting a candidate source of the WOW! Signal: a possible Sun-like star in the Gaia Archive, 2MASS 19281982-2640123, located […]