How Big Could Human Civilization?
Summary
Isaac Arthur explores the maximum scale of human civilization by climbing a three-part ladder: baseline planetary expansion, advanced space engineering, and post-human digital minds. He calculates population ceilings for Earth, the solar system, and the galaxy, arguing that stars and Dyson swarms dwarf classic planet-based empires. The episode then shifts to uploaded consciousness, using Landauer’s limit to show how Matrioska Brains could host 10^43 to 10^52 minds across galactic and supercluster scales. Arthur concludes that the largest civilization may not be a single empire but a vast, b…
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