https://www.theregister.co.uk/2019/09/20/asteroid_blasted_earth/

A huge collision in the Solar System’s asteroid belt may have triggered an ice age on Earth that froze our planet... some 466 million years ago.

Eggheads believe a 93-mile wide space rock floating between Mars and Jupiter was smashed to pieces as it crashed into something else, perhaps another cosmic boulder. The prang showered our home world with dust, which blocked out the Sun’s rays and chilled global temperatures.