LSST Mirror LiftOctober 2008. The 8.4-meter LSST mirror blank has been successfully lifted from the furnace hearth at the Steward Observatory Mirror Lab, installed into a turning ring, and tilted to a vertical position. It is now ready for core cleanout, which will reduce its mass from 46,500 kg to 16,600 kg. The mirror is scheduled to be completed in January 2012, and will be the largest two-surface optical mirror ever made from a single substrate. (Image credit: Jeffrey S. Kingsley/UA Steward Observatory)
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