Our planet’s first known mass extinction happened about 440 million years ago. Species diversity on Earth had been increasing ...

Once again, sea creatures took the biggest hit. Theories point to rising and falling sea levels, climate change, or even asteroid impacts. One idea suggests that expanding plant life on land may ...

This realization led Wright and his co-authors to connect the cosmic phenomenon with mass extinctions on Earth. Cataclysmic events have taken place five times in the past 500 million years ...

This realization led Wright and his co-authors to connect the cosmic phenomenon with mass extinctions on Earth. Cataclysmic events have taken place five times in the past 500 million years, killing ...