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We are still an early space civilization. We don't know if more advanced ones must have an energy trail as we don't have their science yet. We don't know even i
by gmuslera 3y ago
We are still an early space civilization. We don't know if more advanced ones must have an energy trail as we don't have their science yet. We don't know even if they must expand neither, nor live in planetary surfaces or a lot of things that culture assumes from other civilizations.
- lifthrasiir 3y agoYou are entirely correct, hence my assumption. I think non-expansive civilizations are out of question as it's far more likely that we are never able to detect them even if they exist. The energy trail is more debatable, but that necessarily needs a violation of the second law of thermodynamics, so it still sounds like a reasonable assumption to make.