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Amateur astronomers watch the night sky during the Perseid meteor shower.. Amateur astronomy is a hobby where participants enjoy observing or imaging celestial objects in the sky using the unaided eye, binoculars, or telescopes.
The 100-inch (2.54 m) Hooker reflecting telescope at Mount Wilson Observatory near Los Angeles, USA, used by Edwin Hubble to measure galaxy redshifts and discover the general expansion of the universe. A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. [1]
Telescopes can be classified by optical design or mechanical design/construction. Telescopes can also be classified by where they are placed, such as space telescopes. One major determining factor is type of light, or particle being observed including devices referred to as "telescopes" that do not form an image or use optics.
The NASA Infrared Telescope Facility (right) is an example of a telescope that operates only at near-infrared wavelengths. Main article: Optical astronomy Historically, optical astronomy, which has been also called visible light astronomy, is the oldest form of astronomy. [ 59 ]
The Otto Struve Telescope, dedicated in 1939, was the first large telescope built at the observatory. [9] [10] It is located on Mt. Locke at an altitude of 2,070 m (6,790 ft). The summit of Mt. Locke, accessed by Spur 78, is the highest point on Texas highways. [11] The Harlan J. Smith Telescope, also on Mt. Locke, was completed in 1968. [12] [13]
Lowell Observatory owns and operates the Lowell Discovery Telescope (LDT, formerly the Discovery Channel Telescope) located near Happy Jack, Arizona. This 4.3-meter reflecting telescope is the fifth-largest telescope in the contiguous United States and one of the most powerful in the world, thanks to a unique housing that can accommodate up to ...
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