Why have aliens never visited Earth? Scientists have a disturbing answer
Aliens could be forced to give up cosmic expansion to avoid catastrophe.
Source: space.com
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Aliens could be forced to give up cosmic expansion to avoid catastrophe.
A Fermi Paradox solution may involve alien civilizations either collapsing or prioritizing homeostasis instead of space travel.
Aliens could be forced to give up cosmic expansion to avoid catastrophe.
Astrobiologists suspect the energy demands of aliens make interstellar travel impossible.
Astrobiologists think extraterrestrial civilisations grow so much that they hit crisis points, missing the chance to set out for new worlds