ETI Archives

A relic of extraterrestrial intelligence left behind Grok via Astrobiology.com - Original image source A close-up image of the rocks on Ryugu, taken by MASCOT. Photo: Jaumann et al (Science (2019)

Biosignatures & Paleobiology, Intelligence & Language, SETI & Technosignatures, Status Report

Dust To Dust: Prospects For Passive Technosignatures As Relics Of ETI

by Keith CowingJune 22, 2026June 21, 2026

Technological societies are separated in time, not just space — that is the lesson of the Drake equation.

Radio spectrograms from our ATA observations. The diagonal stripe at the center is visible in observations of 3I/ATLAS as well as in off-target observations - characteristics expected from local (human) sources of interference - and hence can be rejected as a candidate technosignature (image: Sheikh et al. 2025).

Astronomy & 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

by Keith CowingDecember 22, 2025December 22, 2025

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 […]

ETI

Dust To Dust: Prospects For Passive Technosignatures As Relics Of ETI

Breakthrough Listen Observations Of Interstellar Object 3I/ATLAS

Atmospheric Evolution Through Outgassing And Escape On Young Molten Rocky Exoplanets

The Exozodi Spectral Effect: Residual Habitable Zone Dust May Bias ExoEarth Characterization

The Majority Of Hot Jupiters Formed Beyond The Water Ice Line

Sulfur Photochemistry Observationally Traces Mantle Redox States Of Rocky Planets

Tracing The Source Of Carbon Oxides On The Large Moons Of Uranus