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A sufficiently advanced civilization could reveal itself through:

narrowband radio; pulsed lasers; broadband communication l...
arousing patrolman
  09/28/26


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Date: September 28th, 2026 8:55 PM
Author: arousing patrolman

narrowband radio;

pulsed lasers;

broadband communication leakage;

planetary radar;

propulsion emissions;

industrial atmospheric species;

excess mid-IR waste heat;

artificial illumination;

large orbital structures;

anomalous transits;

atmospheric pollution;

unusual spectral lines;

spacecraft operating elsewhere in the system.

(http://www.autoadmit.com/thread.php?thread_id=5907638&forum_id=2#50159687)