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Time Without End
Dyson's 1979 Reviews of Modern Physics paper proving that intelligence could, in principle, persist forever in an open universe by progressively slowing its metabolism to match declining energy availability.
Freeman Dyson's "Time Without End: Physics and Biology in an Open Universe" appeared in Reviews of Modern Physics in 1979 and inverted a century of cosmological pessimism. The standard assumption held that intelligence, like stars, had a finite lifespan — that heat death would extinguish consciousness as surely as it extinguished the last red dwarfs. Dyson showed, with careful thermodynamic argument, that this assumption was wrong. If an intelligent system could hibernate, adjusting its rate of information processing to match the universe's declining temperature, it could in principle think indefinitely while expending only finite total energy. The paper made deep-time thinking rigorous rather than speculative, and it established the framework within which the You On AI cycle now asks whether the structures humans build around AI will serve the persistence of consciousness across cosmic time.
In The You On AI Field Guide
The 1979 paper grew out of Dyson's dissatisfaction with the pessimistic conclusions of Steven Weinberg's The First Three Minutes, which