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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.
Largest does not always equate to being the best telescopes, and overall light gathering power of the optical system can be a poor measure of a telescope's performance. Space-based telescopes , such as the Hubble Space Telescope , take advantage of being above the Earth's atmosphere to reach higher resolution and greater light gathering through ...
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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]
A 21 m. telescope used for academic research and satellite data retrieval and control. Paul Plishner Radio Astronomy and Space Sciences Center Haswell, Kiowa County, Colorado, US An 18-meter telescope under development since 2010 for use by educators in Colorado and others. Sponsored by the Deep Space Exploration Society of Boulder County, Colorado
Inside a planetarium projection hall. (Belgrade Planetarium, Serbia) Inside the same hall during projection.(Belgrade Planetarium, Serbia)A planetarium (pl.: planetariums or planetaria) is a theatre built primarily for presenting educational and entertaining shows about astronomy and the night sky, or for training in celestial navigation.
A small telescope is generally considered by professional astronomers to be any reflecting telescope with a primary mirror that is less than 2 metres (80 in) in diameter. [1] [citation needed] By amateur standards, a small telescope can have a primary mirror/aperture less than 6–10 inches (150–250 mm) in diameter. [2]
Starting in the 1990s, many telescopes have developed adaptive optics systems that partially solve the seeing problem. The best systems so far built, such as SPHERE on the ESO VLT and GPI on the Gemini telescope, achieve a Strehl ratio of 90% at a wavelength of 2.2 micrometers, but only within a very small region of the sky at a time.
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