11. Asteroid impact
Considering it was an asteroid that wiped out the dinosaurs more than 65 million years ago, there's something eerily believable about this one. If (and when) we do get pummeled by the big one, it has the potential to set off super tsunamis, earthquakes, and volcanic eruptions that'll send our pale blue dot into a chaotic tailspin of doom.
Joe McGauley is a senior editor at Supercompressor and will most certainly suffer from black hole nightmares from now on.