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Galileo discovers a telescope(he does not invent the telescope) in 1609 in Italy. He is the first to use it systematically to observe celestial objects.
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Sir Isaac Newton creates a telescope creates a trype of reflecting telescope completed in 1668. It uses a concave primary mirror and a flat diagonal secondary mirror.
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Johannes Hevelius built a 150-foot telescope, which hung from ropes and had to be operated by a group of workmen.
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William Hirshel discovered Uranus using his telescope. The image was a little fuzzy but he noticed a disk shifting across the background of stars, he disovered that it was a planet,
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William Herschel made a 40-foot reflecting telescope. It was the biggest telescope in the world for 50 years.
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William Parsons, the 3rd Earl of Rosse built a 72 inch (in diameter) by Birr Castle in Ireland, It discovered the first spiral nebulae.
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A 40-inch telescope was constructed in Yerkes Observatory. It is still the largest refracting telescope ever built.
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Hubble Space telescope (named after Edwin Hubble) lauched into its low earth orbit on April 25, 1990. It was created by Americans.
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Large Binocular Telescope saw first light. It is located in Arizona. It is one of the world's most advanced optical telescopes.
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The Gran Telescopio Canarias was built in the Canary Islands of Spain. It is the largest telescope in the world.
