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Some telescopes are classified by the task they perform; for example Solar telescopes are all designs that look at the Sun, Dobsonian telescopes are designed to be low cost and portable, Aerial telescopes overcame the optical shortcomings of 17th-century objective lenses, [1] etc.
Extremely Large Telescope, Chile – 39.3 m (1,550 in). Construction began in 2018, first light planned in 2028. [23] Thirty Meter Telescope, Hawaii, USA – 30 m (1,200 in). Construction began in 2014 but halted in 2015; as of 2022 it has not resumed. [24] Giant Magellan Telescope, Chile – seven 8.4 m mirrors on a single mount. This provides ...
Telescope History Archived 2021-02-14 at the Wayback Machine, NASA Official Website, accessed 02/09/2019; History of the Telescope, accessed 02/09/2019; List of astronomical observatories and telescopes, Encyclopedia Britannica, 02/09/2019; Major Space Telescopes, Space.com, By Andrea Thompson, 05/18/2009
For example, the James Clerk Maxwell Telescope observes from wavelengths from 3 μm (0.003 mm) to 2000 μm (2 mm), but uses a parabolic aluminum antenna. [20] On the other hand, the Spitzer Space Telescope , observing from about 3 μm (0.003 mm) to 180 μm (0.18 mm) uses a mirror (reflecting optics).
The James Webb Space Telescope is set to launch after decades of work. Mission critical: Unravel the most enduring mysteries in space. NASA's cosmic time machine is ready.
The main material used early on for reflecting telescope mirrors was speculum metal, which reflected only about two-thirds of the incident light, and which tarnished, requiring maintenance. Two-element refracting telescopes were extensively used in 19th century observatories despite their smaller apertures than metal, and later glass, mirror ...
The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
It is made up of 36 identical antennas, each 12 metres in diameter, with a 30 sq degrees FoV at 1.4 GHz. [27] Australia Telescope Compact Array (ATCA) Paul Wild Observatory, Narrabri, New South Wales 0.3–110 GHz 6x22m dish aperture synthesis array, operated by CSIRO as part of the ATNF (Australia Telescope National Facility). [28]
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