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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
(a)Image of Neptune from an Earth-based telescope without
(b)Image of Neptune from the same Earth-based telescope with
(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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- Spring '08