If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?: Seventy-Five Solutions to the Fermi Paradox and the Problem of Extraterrestrial Life

by Stephen Webb

So here is a scenario that explains why we haven’t been visited. Any civilization that develops the ability to embark on large-scale, economic colonization of its stellar neighborhood inevitably collapses within a few thousand years because its rate of migration can’t possibly match its growth.

Wow