Retrieving "Technosignature" from the archives

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1. Exoplanets

   Linked via "technosignatures"

   Biosignatures and Technosignatures
   Atmospheric characterization using transmission spectroscopy during transits allows scientists to infer atmospheric composition. The detection of certain molecular combinations, known as biosignatures (e.g., high levels of $\text{O}2$ coexisting with $\text{CH}4$), suggests biological activity. A growing area of study is the detection of "technosignatures," non-natural emissions that might indicate advanced civilizations. Anomalous persistent signals in the […