Each 10-meter Keck telescope reaches its full aperture using what arrangement?

1. A single 10-meter disc of glass would be far too heavy to hold in shape. 2. Each Keck telescope instead uses 36 hexagonal mirrors, each 1.8 meters wide. 3. Computer-controlled motors keep the 36 pieces aligned so they act as one surface. 4. The result collects light like a single mirror 10 meters across. _Source: OpenStax Astronomy (CC BY 4.0), section 6.2 Telescopes Today_