Chap3 - Light_Telescopes

B after melting spinning and cooling the mirrors

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Unformatted text preview: er melting, spinning, and cooling, the mirror’s parabolic surface is ready for final smoothing and coating with a highly reflective material. The same star field photographed with (a)a ground-based telescope, which is subject to poor seeing conditions that result in stars twinkling, and (b)the Hubble Space Telescope, which is free from the effects of twinkling. The view from Kitt Peak in 1959 The same skyline in 1989 These two images of Tucson, Arizona, were taken from the Kitt Peak National Observatory, which is 38 linear miles away. They show the dramatic growth in ground light output between 1959 and 1989. Since 1972, light pollution, a problem for many observatories around the world, has been at least partially controlled by a series of local ordinances. The Hubble Space Telescope (HST): in 1993, at completion of the first servicing mission. HST has studied the heavens at infrared, visible light, and ultraviolet wavelengths. Using adaptive optics, which calculate the amount of twinkling of our atmosphere and change the shape of the mirror accordingly, we can receive better images from ground-based telescopes. (a)Image of Neptune from an Earth-based telescope without adaptive optics. (b)Image of Neptune from the same Earth-based telescope with adaptive optics. (c)Image of Neptune from the Hubble Space Telescope, which does not incorporate adaptive optics technology. The 10-m Keck telescopes at Mauna Kea volcano in Hawaii. These huge twin telescopes each consist of 36 hexagonal mirrors measuring 1.8 m (5.9 ft) across. Each Keck telescope has the light-gathering, resolving, and magnifying ability of a single mirror 10 m in diameter. Orion as Seen in Visible, Ultraviolet, and Infrared Wavelengths. This new radio telescope at the National Radio Astronomy Observatory in Green Bank, West Virginia, has its prime focus hardware located off-center from the telescope’s 100-m x 110-m oval reflector. National Radio Astronomy Observatory, Green Bank, WV The 27 radio telescopes of the Very Large Array (VLA) system are arranged along the arms of a Y in central New Mexico. Besides bei...
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