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Johannes Kepler discovered the principle of the astronomical telescope built with convex lenses.
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The English James Gregory invents the first reflecting telescope with a parabolic primary mirror and a concave and elliptical secondary mirror.
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Physicist and mathematician Isaac Newton builds the first reflecting telescope. In 1672 he presented it at the Royal Society of London.
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The invention of the achromatic objective in 1757 by the British optician John Dollend and the improvement of the optical rock crystal (flint glass) in 1754, soon allowed the construction of highly refined refracting telescopes.
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English astronomer William Herschel tilted the mirror of his telescope and positioned the eyepiece so that it did not block the incident rays
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William Lassel refined Herschel's optics using the Parsons process. He installed the mirror on an equatorial mount with metal lenses speculates. Discovery of satellites like Triton on Saturn, Uranus and Neptune.
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1879
It was built at the University of Chicago thanks to the initiative of the astronomer George Ellery Hale. With a 101 cm diameter lens cast by famed maker Alvan Clark and sons. -
Installed in the Monte Wilson observatory (USA). It is a 2.5 meter diameter reflecting telescope.
He discovered new galaxies and helped establish the theory of the expansion of the universe. -
The German optician Bernard Schmidt invented a telescope combining the reflector and refractor systems that could clearly photograph large areas of the sky.
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Hale's telescope has a 5-meter mirror. He discovered quasars, he was the first to measure the expansion of the universe. And it found Comet 1P / Halley, located on Mount Palomar (USA)
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The Multiple Mirror Telescope (MMT) combined the light from 6 independent 1.8 meter concave mirrors.
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Keck's telescope is the first with hexagonal telescopes. It reaches galaxies, remote and supernovae.
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Grantecan is the largest and most powerful telescope in the world that was launched in July.
It is located 2,400 meters at the altitude of the island of Palma.
