Scientists Construct Huge 20-Ton Mirror for Next Mega-Telescope
Wednesday, August 28, 2013 - 07:00
in Astronomy & Space
The third of the seven primary mirrors for the Giant Magellan Telescope was cast Saturday at the University of Arizona's Steward Observatory Mirror Lab. The 20-ton mirror was formed by melting chunks of borosilicate glass in a rotating furnace at 2,140 de