Add Yahoo as a preferred source to see more of our stories on Google. My hypothesis is that remnants of a supernova – an exploding star – had an impact on the Earth’s past climate, causing global ...

The curious minds at What If explore what would happen if a nearby supernova exploded close to Earth, revealing radiation exposure, atmospheric disruption, and mass extinctions.

A "near earth" supernova could have produced cosmic rays (radiation from outer space) which might have caused a reduction in the earth's ozone layer. Increased cloud cover associated with cosmic ...