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2. List of largest optical reflecting telescopes - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_optical...

   W. M. Keck Observatory. Subaru Telescope. Hobby–Eberly Telescope. Large Binocular Telescope. Very Large Telescope. Southern African Large Telescope. Gemini Observatory. Gemini Observatory. This list of the largest optical reflecting telescopes with objective diameters of 3.0 metres (120 in) or greater is sorted by aperture, which is a measure ...

3. Giant Magellan Telescope - Wikipedia

   en.wikipedia.org/wiki/Giant_Magellan_Telescope

   The Giant Magellan Telescope (GMT) is a ground-based, extremely large telescope currently under construction at Las Campanas Observatory in Chile's Atacama Desert. With a primary mirror diameter of 25.4 meters, it is expected to be the largest Gregorian telescope ever built, observing in optical and mid-infrared wavelengths (320–25,000 nm). [1]

4. Extremely large telescope - Wikipedia

   en.wikipedia.org/wiki/Extremely_large_telescope

   Extremely large telescope. An extremely large telescope (ELT) is an astronomical observatory featuring an optical telescope with an aperture for its primary mirror from 20 metres up to 100 metres across, [1][2] when discussing reflecting telescopes of optical wavelengths including ultraviolet (UV), visible, and near infrared wavelengths.

5. 40-foot telescope - Wikipedia

   en.wikipedia.org/wiki/40-foot_telescope

   William Herschel 's 40-foot telescope, also known as the Great Forty-Foot telescope, was a reflecting telescope constructed between 1785 and 1789 at Observatory House in Slough, England. It used a 48-inch (120 cm) diameter primary mirror with a 40-foot-long (12 m) focal length (hence its name "Forty-Foot"). It was the largest telescope in the ...

6. Large Binocular Telescope - Wikipedia

   en.wikipedia.org/wiki/Large_Binocular_Telescope

   The Large Binocular Telescope (LBT) is an optical telescope for astronomy located on 10,700-foot (3,300 m) Mount Graham, in the Pinaleno Mountains of southeastern Arizona, United States. It is a part of the Mount Graham International Observatory .

7. Thirty Meter Telescope - Wikipedia

   en.wikipedia.org/wiki/Thirty_Meter_Telescope

   Thirty Meter Telescope. The Thirty Meter Telescope (TMT) is a planned extremely large telescope (ELT) [5][6][7] proposed to be built on Mauna Kea, on the island of Hawai'i. The TMT would become the largest visible-light telescope on Mauna Kea. [8][9] Scientists have been considering ELTs since the mid 1980s. In 2000, astronomers considered the ...