According to Astrobio, two nearby supernovae that exploded about 2.5 and eight million years ago could have resulted in a staggered depletion of Earth’s ozone layer, leading to a variety of repercussions for life on Earth. In particular, two-and-a-half million years ago the Earth was changing dramatically. The Pliocene, which was a hot and balmy … Continue reading How Supernovae affects Earth