-University of Arizona Richard F. Caris Mirror Laboratory scientists, engineers and technicians have developed innovations in constructing large lightweight mirrors with unprecedented surface accuracy, up to about 27 feet in diameter -These mirrors represent a radical departure from the conventional solid-glass mirrors used in the past, producing a new generation of telescopes now exploring the universe in optical and infrared light -They have a honeycomb structure on the inside; made out of Ohara E-6 low expansion glass which is molded by melting it into a honeycomb interior while spin casting in a custom-designed rotating oven -Honeycomb mirrors offer the advantages of their solid counterparts - rigidity and stability - but they can be significantly larger, and dramatically lighter -527 North National Championship Drive, Tucson mirrorlab.arizona.edu Map