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We think we're the first advanced earthlings -- but how do we really know?

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Author Topic: We think we're the first advanced earthlings -- but how do we really know?  (Read 187 times)
Bringer of Rain, Thunder and Snow, an Undying Saga of Earth
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« on: April 21, 2018, 03:10:35 pm »




How do we really know there weren't previous industrial civilizations on Earth that rose and fell long before human beings appeared? That's the question posed in a scientific thought experiment by University of Rochester astrophysicist Adam Frank.
Credit: University of Rochester illustration/Michael Osadciw
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