What reconciliation factor is suggested for advanced civilizations potentially existing in the past or being too far away now?

Answer

Intelligent life may only exist for a brief, transient window before extinction

One way to reconcile the silence is considering that civilizations might have a relatively short lifespan, meaning they rose and fell long before their light reached us, or they exist now but are separated by vast temporal distances.

What reconciliation factor is suggested for advanced civilizations potentially existing in the past or being too far away now?

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