Some of the most massive and influential stars in the universe are OB stars. These blue giants, many times more massive than the Sun, are short-lived but powerful forces that shape their surroundings.

New research suggests that powerful star explosions, called supernovae, may have caused at least two mass extinctions in Earth’s history. Scientists from Keele University believe that these massive blasts stripped away Earth’s ozone layer,

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.