Extinction events on Earth usually come from two sources: the asteroid belt in between Mars and Jupiter, and the Kuiper belt and Oort cloud. Are we due?
NASA recently discovered a skyscraper-sized asteroid hurtling toward Earth. It heads our way on Halloween and will get almost as close to us as the moon.
There are real dangers to Earth (and to the humans on it) facing us today, but apocalyptic asteroids aren't one of them.