Completed 8.4-meter-diameter primary mirror being transported and integrated with a support system prototype at the University of Arizona’s Richard F. Caris Mirror Lab.

Gemini North returns to cosmic exploration “with a bang” following repair and refurbishment of its 8-meter primary mirror Association of Universities for Research in Astronomy (AURA) ...

But the private sector may come to the rescue. SpaceX's Starship could be used to launch a 6.5-meter mirror in one piece, avoiding the complicated and expensive folding mirrors used by JSWT.

On the Giant Magellan Telescope its giant mirror will be made from seven individual mirrors, each 27.6 feet/8.4 meters in diameter.

Equipped with an 8.4-meter mirror and a 3.2-billion-pixel camera—the largest digital camera ever built for astronomy—the Rubin Observatory is poised to revolutionize how we see the cosmos.

Installing the 3.4-meter mirror brings the facility one step closer to first light, set to take place in 2025.