Just when you thought it was safe to leave your bunker, Nature has a whole pile of stories about cataclysmic asteroid impacts.

Firstly here’s an article about some of the odd theories advanced to explain the Tunguska crater.

Next up, an article about South Pole–Aitken, a crater on the moon that is 2,600 kilometers across and 12 kilometers deep (which as Nature helpfully explains is “big enough to blot out half of China and hide the highest mountains of Tibet”).

And finally, the biggest crater in the solar system: a hole on Mars that is 10,600 kilometers long and 8,500 kilometers wide. There’s even a computer-generated simulation of the asteroid impact smashing the top off Mars. Ouch!