The common lists of technosignatures for Exoplanets and moons often refer to spectrums associated with
pollution, industrial production, nighttime light emissions, radio signals, satellites and other bio signatures
from atmospheric gases, along with four or five others.
As a hypothesis, this document suggests that nuclear events (the actual detonations and fireball) could also be
on the list. While many Earth detonations exist for 1 minute, larger tests have fireballs lasting longer.