We all know that one of these is what took out the dinosaurs, but could it happen again? Experts have always believed that it’s a possibility, in fact NASA’s recent successful DART mission proved we were willing to spend $314 million to redirect one headed our way. But now James Garvin, chief scientist at NASA's Goddard Space Flight Center says he believes we’ve misread signs of some pretty serious asteroid strikes on our planet, ones that have only occurred in the past million years, meaning our statistical chances of getting hit by a big one again are likely much higher than we ever thought.