Ancient Mass Extinctions Could be Caused by Cosmic Radiation

Some studies show that there are cycles of mass extinction on earth every 62 million years. It is now believed that these mass extinctions could be caused by the Milky Way orbiting through space and periodically going through heavy cosmic radiation. Not all extinctions coincide with the 62 million year cycle (for instance, the large dinosaur extincition), but this would explain the 62 million year cycle pattern that has been noticed. The next predicted cycle is to occur in about ten million years...so I think we at least are safe. Stilll, amazing to think about. Here is the link to the rest of the article.