Craters on the moon show it was probably bombarded with asteroids about 800 million years ago, which also rained down on Earth and could have plunged the planet into an ice age
Source:
https://www.newscientist.com/article/2249457-moon-craters-hint-huge-asteroids-bombarded-earth-800-million-years-ago/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home