What Does It Mean for a Civilization to be a Million Years Old?

We thought it would be interesting to revisit Carl Sagan’s great 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 bushbaby or a macaque.”

 

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