The best place to find advanced extraterrestrial civilizations may be at the heart of matter-rich galaxy clusters, according to a top Harvard astronomer.
Harvard University's Abraham Loeb, head of the Astronomy Department, says aliens could have traveled to galaxy clusters in preparation for the impending isolation that could happen to intelligent civilizations as the universe rapidly expands far beyond its current size.
In a paper published in the pre-print server ArXiv, Loeb describes how advanced alien civilizations could have congregated in clusters of thousands of galaxies akin to the Milky Way, similar to how Earth's ancient peoples have flocked to the rivers and lakes.
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