Barrow scale Archives - Astrobiology

(Top) A simulated transit depth spectrum showing SF6 and NF3 in the atmosphere of terrestrial exoplanets of different atmospheric compositions orbiting an M Dwarf star. The concentrations of SF6 and NF3 are at 1 ppm. (Bottom) Absorption cross sections for various atmospheric molecules, including the industrial produced SF6 and NF3. It is noted that concentrations of 1 ppm for both SF6 and NF3 are orders of magnitude above that of present-day Earth’s abundances of these two industrial gases. The high concentrations of SF6 and NF3 could exist in so-called “service worlds”. Figure from (Seager et al. 2023). -- astro-ph.EP

Astronomy & Telescopes, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, SETI & Technosignatures, Status Report

The Search For Technosignatures: A Review Of Possibilities

by Keith CowingMay 22, 2026May 22, 2026

This paper aims to review the diverse range of technosignatures that have been proposed in the literature.