LARRY LANDOLFI / SCIENCE PHOTO LIBRARY LARRY LANDOLFI / SCIENCE PHOTO LIBRARY
At 6,800 feet in altitude, McDonald Observatory atop Mt. Locke in Ft. Davis, Texas, enjoys some of the clearest and darkest skies in the continental United States. Seen at lower left is a Dobsonian telescope, a device consisting of a Newtonian telescope tube (a type of telescope that uses curved mirrors) on an alt-azimuth, or Dobson, mount. This is a composite photo.
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