One dozen out of the eighteen mirror segments that make up the primary flight mirror are now installed on NASA's James Webb Space Telescope!

"Over the next two years in preparation for launch, various components of the Webb telescope will endure rigorous environmental and optical testing. The sunshield will be joined with the spacecraft bus (main structure) followed by more testing. The Webb telescope is planned for launch in 2018."

This telescope really is going to be a game changer. I can't wait for its launch...

James Webb Space Telescope