YERKES OBSERVATORY TOUR 2021 - World's Largest Refracting Telescope!
7:22
Inside the World's Largest Refractor at Yerkes Observatory: Explore Scientific Experiences
22:25
The Telescope that changed the world - Yerkes Observatory and The Great Refractor
22:32
The Pope's Telescopes - Deep Sky Videos
22:29
Can a telescope be too big?
14:23
Restoring Lowell Observatory's Clark Refractor
10:50
The Askar 185 APO is a BUDGET MONSTER
7:52
O maior telescópio ótimo do mundo - ELT
18:29