The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.

The Silurian Hypothesis contemplates how long the ruins of a civilization would be detectable, on Earth or even other worlds, and if we could ever know if a world had once been inhabited by a ...

So far, so not science. However, in 2018 two University of Cambridge scientists named their paper The Silurian hypothesis: would it be possible to detect an industrial civilization in the ...