edit: of course there is vigorous internet commentary about billiard ball smoothness compared to earth:
https://possiblywrong.wordpress.com/2011/01/03/is-the-earth-...
https://skeptics.stackexchange.com/questions/10763/is-earth-...
https://billiards.colostate.edu/faq/ball/smooth/
Which mostly seem to agree that earth definitely is not as smooth as a (new) billiards ball, but there is lots of debate about the details.