What does it mean for a civilisation to be a million years...

What does it mean for a civilisation to be a million years old? We have had radio telescopes and spaceships for a few decades; our technical civilisation is a few hundred years old ... an advanced civilisation millions of years old is as much beyond us as we are beyond a bushbaby or a macaque

Carl Sagan Quote About Mean, Technology, Years: What Does It Mean For...

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