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サマリー
あらすじ・解説
In 1964, Soviet-Russian astrophysicist Nikolai Kardashev proposed a system for classifying extraterrestrial intelligence based on the amount of energy they could harness. The system had three "Types," which included Planetary, Stellar, and Galactic Civilizations. This came to be known as the Kardashev Scale, which remains one of the most important concepts in the Search for Extraterrestrial Intelligence (SETI).