Let's say a mass-extinction causing space object hits Earth every 100 million years (https://en.wikipedia.org/wiki/Extinction_event https://en.wikipedia.org/wik

Let's say a mass-extinction causing space object hits Earth every 100 million years (https://en.wikipedia.org/wiki/Extinction_event https://en.wikipedia.org/wiki/Extinction_event) . That gives us a 1e-8 chance of all 7e9 people being wiped out in one year. That's an average of 700 people killed every year if it were spread out in time. Definitely a serious risk even if not the most pressing right now. It is however more dangerous than terrorism in America, and plenty of money is being spent on that!