Is the Earth smoother than a billiard ball??
You may have heard at some stage that “If the Earth was shrunk down to the size of a billiard ball, it would actually be smoother”. If you haven’t heard it before, well, welcome to the group!
Billiard balls are pretty darn smooth and according to the World Pool-Billiard Association have a tolerance of +/- 0.0127 cm. Essentially, this means that a ball must not have any bumps or indentations greater than 0.127mm- which is about the width of a strand of hair.
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