Maggie's Farm

This planet has had plenty of catastrophic encounters with asteroids over the years, even in recent times.

Wikipedia notes, in the thorough entry on Impact Events:

An impact event is commonly seen as a scenario that would bring about the end of civilization. In 2000, Discover Magazine published a list of 20 likely end of the world scenarios with impact event listed as the number one most likely to occur. Until the 1980s this idea was not taken seriously, but all that changed after the discovery of the Chicxulub Crater which was further reinforced by witness to the Comet Shoemaker-Levy 9 event. Since then there has been more interest from the scientific community and greater public awareness of the possibility of impact events.

Most impact events are small, like shooting stars and meteorites, but the Apophis asteroid is big, and it is due to come too close for comfort in 2036

If it hits the earth, as others have done in the past, it will surely solve all the problems with humans messing up the planet.

Help us, Obi-Wan Algore! You're our only hope.