Glass for the LSST primary and tertiary mirrors is loaded into the mold

LSST Mirror Ready to Fire |  More than 51,000 pounds of glass has been loaded into the mold for the primary and tertiary mirrors for the Large Synoptic Survey Telescope (LSST). Inset pictures show employees from the University of Arizona Steward Observatory Mirror Laboratory placing the first pieces of glass into the mold. The glass will be melted and then spun inside the rotating oven to create the 8.4-meter mirror.

Image credit: R. Bertram/Steward Observatory and LSST Corporation