Subaru and Keck

Note the people on the catwalk of Subaru. They reveal the truly massive scale of these telescopes. In the foreground is Keck.

 

Random trivia: Subaru is the largest telescope ever built that has the ability to mount an eyepiece. The princess of Japan visited for the telescope's first light and was able to look through it. The eyepiece was left on for a few days after this, and the observatory's staff had the opportunity to enjoy it.

Done