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The 8.2-foot (2.5-meter) primary mirror on NASA's Astrophysics Stratospheric Telescope for High Spectral Resolution Observations at Submillimeter-wavelengths mission, or ASTHROS, is one of the largest to ever fly on a high-altitude balloon. The lightweight mirror, shown here, is coated in gold and nickel to make it more reflective in far-infrared wavelengths. NASA contracted Media Lario, an optics company in Bosisio Parini, Italy, to design and produce ASTHROS' full telescope unit, including the primary mirror, a secondary mirror, and supporting structure (called the cradle). The mirror is pi…
