Using liquids to create telescope mirrors is not a new idea; it was suggested by Isaac Newton, who invented a reflecting telescope in 1668.

Around 1668 he managed to produce a functioning reflecting telescope using a mirror made of a copper-tin-arsenic alloy of his own devising. ... A reflecting telescope, having no lenses, ...

Invented the reflecting telescope. The standard telescope of Newton's time, ... His original reflecting telescope, which he built himself in 1668, was just six inches long.

In 1668, he built the world’s first reflecting telescope, which had the distinction of using a curved mirror. The Royal Greenwich Observatory was founded in 1675 by King Charles II.

1668 Isaac Newton invents a small but powerful reflecting telescope using mirrors. 1672 Laurent Cassegrain, a French priest, invents a reflecting telescope based on Gregory’s principles.

Invented the reflecting telescope. The standard telescope of Newton's time, ... His original reflecting telescope, which he built himself in 1668, was just six inches long.

An optical reflecting telescope works by using a mirror to reflect incoming light. The image is formed by a reflection from a curved mirror, which is then magnified by a second mirror.

The reflecting telescope made by William Herschel is made of wood. SSPL/Getty Images Located around 100 miles west of London, fast-growing Bath had a lively intellectual scene at the time.

Eversince 1668, when Isaac Newton built the first reflector telescope with aone-inch diameter mirror made of metal, astronomers have longed for biggerparabolic mirrors.

Among them are Keck 1 and Keck 2, the next-largest reflecting telescopes on Earth after the Gran Telescopio Canarias. About the Author. Adrienne LaFrance. Follow.