[Hank Green] posted an interesting video about the first liquid mirror telescope from back in the 1850s. At the time, scientists were not impressed. But, these days, people are revisiting the idea.

Because his telescope offered a much greater field ... He cast a two-inch metal mirror and ground it so that it had a spherical curvature. He placed the mirror at one end of a tube.

In his description, the shaped mirror was composed of an array of polished metal plates and the actuators ... mirror located in a plane conjugate to a telescope's primary mirror could be used ...

The European Southern Observatory's (ESO) Extremely Large Telescope (ELT) — the world's largest visible- and infrared-light telescope — is currently under development on the Cerro Armazones mountain ...

Telescope mirrors require some kind of metal coating to reflect as much light as possible. JWST uses gold mirrors to catch UV and visible light emitted by early luminous objects. Secondly ...

The James Webb Telescope's gold mirrors aren’t just for looks—they’re a scientific marvel. Gold reflects up to 99% of infrared light, making it ideal for Webb’s cosmic observations.

Publications of the Astronomical Society of the Pacific, Vol. 119, No. 854 (April 2007), pp. 456-465 (10 pages) ABSTRACT The quality of astronomical images obtained with the 3 m liquid‐mirror ...

Credit: Galileo Galilei, 1610 Within sixty years, Isaac Newton had built his own new and improved reflecting telescope with a curved mirror, coated with a fine layer of reflective silver metal ...

Adaptive optics relies on wave-front sensors to measure aberrations in light coming into a telescope ... The mirror's surface can be coated with a broad range of metal and multilayer-dielectric ...

The central feature of the telescope is an exquisitely polished, concave primary mirror, 2.4 meters (7.9 feet) in diameter. The primary mirror sits beneath a smaller, secondary mirror that ...

William Herschel discovered the planet Uranus with a handmade reflecting telescope—he cast his metal mirrors in his garden and basement, and once had to flee from a coursing river of molten ...