Scientists Create First Ultrathin, Compact Metalens Telescope Capable of Imaging Far-Away Objects

Launched in 1957, the first balloon-borne telescope (Stratoscope I) featured a 12-inch primary mirror and a 35mm movie camera. The floating observatory was used to study turbulence in the Sun’s photosphere from 80,000 feet above Earth’s surface, avoiding the obscuring effect of Earth's atmosphere.

Flat, pancake-sized metalens images lunar surface in an engineering first

In India, train tracks threaten a giant telescope