LSST Primary/Tertiary Mirror Blank

Members of the team building the LSST, a large survey telescope being built in Northern Chile, gather to celebrate the successful casting of the telescope’s 27.5-foot-diameter mirror blank.

Seated on the mirror (L-R): LSST Director Tony Tyson, LSST System Scientist Zeljko Ivezic, LSST System Engineer Chuck Claver, and LSST Project Manager Don Sweeney.