Necrosignatures and the SEETI Quest: Searching for Extinct Extraterrestrial Civilizations
To the point
Jack O'Malley-James suggests space archaeology should search for necrosignatures, the leftovers of extinct civilizations, by looking for post-catastrophe clues like lingering gases to infer how often civilizations arise and how long they last, and to consider extraterrestrial foul play if natural explanations fail.
