Violent supernovae ‘triggered at least two Earth extinctions,’ study suggests

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. 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. Astrobiology Planetary Sciences Phys.org – latest science and technology news stories