Elon Musk’s plans refer to an idea conceived in the 1960s. What is the Kardashev scale?
- Posted on July 10, 2026
- By CNN
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- 1 min read
Elon Musk’s plans refer to an idea conceived in the 1960s. What is the Kardashev scale?
A Soviet astronomer in the 1960s proposed a scale to classify hypothetical alien civilizations. Here’s why the framework is still coming up today.
