"No, Earth is not as smooth as a billiard ball! ... The billiard-ball-sized Earth’s smoothness would be equivalent to that of 320-grit sandpaper." https://ourp

"No, Earth is not as smooth as a billiard ball! ... The billiard-ball-sized Earth’s smoothness would be equivalent to that of 320-grit sandpaper." https://ourplnt.com/earth-smooth-billiard-ball/ https://ourplnt.com/earth-smooth-billiard-ball/ A comment on the article, though, says "I’d like to point out that Earth is about 3400 times flatter than a regulation pool table...I love saying it – The Earth is flatter than a pool table!"