PHOENIX, Aug. 26 (UPI) -- A furnace in Arizona is melting glass to pour a 27-foot mirror for a giant telescope with 10 times the resolution of the Hubble Space Telescope, scientists say.
The mirror, destined for the Giant Magellan Telescope to go into operation in Chile's Atacama Desert by 2022, will take a full year to polish to within 1/20 the wavelength of light, a tolerance on the scale of about 1 in 10 billion, they said.