Mind Explosion - The Physics of Extraterrestrial Civilizations

Dr. Michio Kaku has an interesting article trying to explain how advanced extraterrestrial civilizations possibly be?

The late Carl Sagan once asked this question, “What does it mean for a civilization to be a million years old? We have had radio telescopes and spaceships for a few decades; our technical civilization is a few hundred years old... an advanced civilization millions of years old is as much beyond us as we are beyond a bush baby or a macaque.

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