Giant Telescope
47min -
For this tough job, Sean Riley joins a team of engineers to move and clean a 24-foot, 23-ton, $15 million telescope mirror. Here, three telescopes are used together to form the largest combined telescope in the world. But right now one of them has a mirror in need of a cleaning. After battling strong winds, fixing a broken pump in a giant washing machine and resolving a rigging issue (thanks to Riley), the team recoats the telescope's mirror with aluminum using an enormous vacuum.
7.9
