Researchers say they may have found the cause of mass extinctions on Earth. Two nearby supernovae that exploded about 2.5 and 8 million years ago would have reduced ozone layer and affected life on...
Researchers say they may have found the cause of mass extinctions on Earth. Two nearby supernovae that exploded about 2.5 and 8 million years ago would have reduced ozone layer and affected life on...
Recovery after the world's worst mass extinction, or "Great Dying" that occurred about 252 million years ago, was slowed by two other extinction events, says a study.The Earth has experienced five...