Physics A new technique involving lasers can measure long distances more precisely than ever, which could be useful for space telescopes Facebook / Meta Twitter / X icon Linkedin Reddit Email Laser beams in a physics laboratoryCallum Fraser / Alamy Stock Photo A new way to gauge distance using lasers can measure lengths of more than 100 kilometres to within a thousandth of the width of a human hair, and could be used to make better space telescopes. In lab-settings, scientists can use lasers to ...