Two of Earth’s five confirmed mass extinction events could have been caused by nearby supernova explosions stripping the ...

But once Gondwana took up its polar position in the late Ordovician ... the planet toward the end of the Ordovician. This resulted in the second largest mass extinction of all time, wiping ...

At least two mass extinction events in Earth's history were likely caused by the "devastating" effects of nearby supernova explosions, a new study suggests. Researchers at Keele University say these ...