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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. The Hobby Eberly Telescope (on hill in background) at 9.2 M (360') is one of the largest telescopes in the world. Like a giant, flat honeycomb, it is made up of a number of 36' six-sided mirrors, and it is used solely for studying starlight by spectroscopy. Star trail composite photo.