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It does make you wonder, although if a 'Type 3' civilization really existed, it does beg the question of why we've never come into contact.
Originally posted by RationalDespair
The idea of using scales to differentiate civilization levels was proposed in the early sixties by Soviet astronomer Nikolai Kardashev, and it still bears his name, the Kardashev scale. His intention was to measure a civilization's progress by the amount of energy consumption / utilization.