In April 1965, Soviet astronomers held an urgent press conference announcing they had detected a radio signal from an alien super civilization coming from a fluctuating source called CTA-102. American astronomers quickly showed it was a quasar, but the man behind the claim, Nikolai Kardashev, turned that public embarrassment into the most famous framework for classifying alien civilizations in astrophysics. This episode traces his intellectual biography from the Cold War SETI research group he joined in Moscow in 1962, through the 1964 conference in Armenia where he proposed ranking civilizations by raw energy consumption, to the later papers that redefined advanced life as information processors.

The discussion breaks down the mechanics of Type I planetary, Type II stellar, and Type III galactic civilizations, explains why Carl Sagan added ...