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Over 13,000 steel beams support the world's largest fully-steerable telescope in Green Bank, West Virginia. The Green Bank Telescope weighs 17 million pounds, and moves on a rotating base and a tilting gear. The triangular-armed yoke at the base supports the tilting gear. And a gigantic pyramid arm attaches behind the dish to give it strength to tower over 200 feet above the surface.

Credit: NRAO/AUI/NSF

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GBT Radio Telescopes and Technology

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The National Radio Astronomy Observatory is a facility of the U.S. National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
	Founded in 1956, the NRAO provides state-of-the-art radio telescope facilities for use by the international scientific community. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media.
	The U.S. National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 "to promote the progress of science; to advance the national health, prosperity, and welfare; to secure the national defense..."
	AUI collaborates with the scientific community and research sponsors to plan, build, and operate cutting-edge facilities. We cultivate excellence, deliver value, enhance education, and engage the public.