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Here are the 10 keywords and summaries in the Wikipedia article referencing the "Telescope" keyword.

Telescope
Telescope (100)

•           A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).

•           The word telescope can refer to a wide range of instruments detecting different regions of the electromagnetic spectrum.

•           The idea that the objective, or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope.

Telescope
Telescope (100)

•           A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).

•           The word telescope can refer to a wide range of instruments detecting different regions of the electromagnetic spectrum.

•           The idea that the objective, or light-gathering element, could be a mirror instead of a lens was being investigated soon after the invention of the refracting telescope.

•           Another classification is by location: ground telescope, space telescope, or flying telescope.

•           An optical telescope gathers and focuses light mainly from the visible part of the electromagnetic spectrum (although some work in the infrared and ultraviolet).

•           Other optical telescopes: Ultraviolet telescope, shorter wavelengths than visible light X-ray telescope, shorter wavelengths than ultraviolet light Infrared telescope, longer wavelengths than visible light Submillimetre telescopes, longer wavelengths than infrared light As wavelengths become longer, it becomes easier to use antenna technology to interact with electromagnetic radiation (although it is possible to make very tiny antenna).

•           Also using reflecting optics, the Hubble Space Telescope with Wide Field Camera 3 can observe from about 0.2 μm (.0002 mm) to 1.7 μm (.0017 mm) (from ultra-violet to infrared light).

telescopes (100)

•           The earliest evidence of working telescopes were the refracting telescopes that appeared in the Netherlands in 1608.

•           The potential advantages of using parabolic mirrors—reduction of spherical aberration and no chromatic aberration—led to many proposed designs and several attempts to build reflecting telescopes.

•           The invention of the achromatic lens in 1733 partially corrected color aberrations present in the simple lens and enabled the construction of shorter, more functional refracting telescopes.

•           Reflecting telescopes, though not limited by the color problems seen in refractors, were hampered by the use of fast tarnishing speculum metal mirrors employed during the 18th and early 19th century—a problem alleviated by the introduction of silver coated glass mirrors in 1857, and aluminized mirrors in 1932.

•           The maximum physical size limit for refracting telescopes is about 1 meter (40 inches), dictating that the vast majority of large optical researching telescopes built since the turn of the 20th century have been reflectors.

•           The 20th century also saw the development of telescopes that worked in a wide range of wavelengths from radio to gamma-rays.

•           A vehicle or permanent campus containing one or more telescopes or other instruments is called an observatory.

•           Other optical telescopes: Ultraviolet telescope, shorter wavelengths than visible light X-ray telescope, shorter wavelengths than ultraviolet light Infrared telescope, longer wavelengths than visible light Submillimetre telescopes, longer wavelengths than infrared light As wavelengths become longer, it becomes easier to use antenna technology to interact with electromagnetic radiation (although it is possible to make very tiny antenna).

•           Fresnel Imager, an optical lens technology X-ray optics, optics for certain x-ray wavelengths Radio telescopes are directional radio antennas used for radio astronomy.

•           Multi-element Radio telescopes are constructed from pairs or larger groups of these dishes to synthesize large 'virtual' apertures that are similar in size to the separation between the telescopes; this process is known as aperture synthesis.

•           Higher energy X-ray and Gamma-ray telescopes refrain from focusing completely and use coded aperture masks: the patterns of the shadow the mask creates can be reconstructed to form an image.

•           Cosmic-ray telescopes usually consist of an array of different detector types spread out over a large area.

observatory (18)

•           A vehicle or permanent campus containing one or more telescopes or other instruments is called an observatory.

wavelengths (11)

•           The 20th century also saw the development of telescopes that worked in a wide range of wavelengths from radio to gamma-rays.

•           Other optical telescopes: Ultraviolet telescope, shorter wavelengths than visible light X-ray telescope, shorter wavelengths than ultraviolet light Infrared telescope, longer wavelengths than visible light Submillimetre telescopes, longer wavelengths than infrared light As wavelengths become longer, it becomes easier to use antenna technology to interact with electromagnetic radiation (although it is possible to make very tiny antenna).

•           Fresnel Imager, an optical lens technology X-ray optics, optics for certain x-ray wavelengths Radio telescopes are directional radio antennas used for radio astronomy.

reflecting telescopes (11)

•           The potential advantages of using parabolic mirrors—reduction of spherical aberration and no chromatic aberration—led to many proposed designs and several attempts to build reflecting telescopes.

•           Reflecting telescopes, though not limited by the color problems seen in refractors, were hampered by the use of fast tarnishing speculum metal mirrors employed during the 18th and early 19th century—a problem alleviated by the introduction of silver coated glass mirrors in 1857, and aluminized mirrors in 1932.

mirrors (11)

•           The potential advantages of using parabolic mirrors—reduction of spherical aberration and no chromatic aberration—led to many proposed designs and several attempts to build reflecting telescopes.

•           Reflecting telescopes, though not limited by the color problems seen in refractors, were hampered by the use of fast tarnishing speculum metal mirrors employed during the 18th and early 19th century—a problem alleviated by the introduction of silver coated glass mirrors in 1857, and aluminized mirrors in 1932.

electrons (11)

•           Very high energy gamma-rays are still photons, like visible light, whereas cosmic-rays includes particles like electrons, protons, and heavier nuclei.

radio telescopes (10)

•           Fresnel Imager, an optical lens technology X-ray optics, optics for certain x-ray wavelengths Radio telescopes are directional radio antennas used for radio astronomy.

•           Multi-element Radio telescopes are constructed from pairs or larger groups of these dishes to synthesize large 'virtual' apertures that are similar in size to the separation between the telescopes; this process is known as aperture synthesis.

astronomy (9)

•           Fresnel Imager, an optical lens technology X-ray optics, optics for certain x-ray wavelengths Radio telescopes are directional radio antennas used for radio astronomy.

radiation (9)

•           A telescope is an instrument that aids in the observation of remote objects by collecting electromagnetic radiation (such as visible light).

•           Other optical telescopes: Ultraviolet telescope, shorter wavelengths than visible light X-ray telescope, shorter wavelengths than ultraviolet light Infrared telescope, longer wavelengths than visible light Submillimetre telescopes, longer wavelengths than infrared light As wavelengths become longer, it becomes easier to use antenna technology to interact with electromagnetic radiation (although it is possible to make very tiny antenna).

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