Casting of the secondary mirror for the European Southern Observatory’s Extremely Large Telescope has been completed in Mainz, Germany. Weighing 3.5 tons and measuring 14 feet in diameter, the ...

Getting closer to the winter season, an inquiring mind among readers wanted to know: I have had my convex mirrors crack in the wintertime more than once and was wondering if I am the only one and what ...

Glass and glass products manufacturer Corning and defense technologies firm L3Harris Technologies have announced the successful installation of a jointly-produced a 3.5 m-wide, 680 kg glass mirror (11 ...