You are given a sentence in Galician. Your job is to translate the Galician sentence into English.

Se pensan na precision destes espellos, as protuberancias no espello, en todos eses case 9 metros, representan menos dunha millonesima parte dun centimetro.
And so, if you think about the precision of these mirrors, the bumps on the mirror, over the entire 27 feet, amount to less than one-millionth of an inch.