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Not Your Average Telescope

This 140-foot aluminum-clad parabolic dish antenna sits on the world’s largest polar-aligned mount. The rounded yoke swivels around the central axis of the telescope which is aligned perfectly with the rotational axes of the Earth. In this way, the 43-meter dish can easily track objects in the sky as they appear to rise and set from the Earth’s spin on its axis. The small white tower to the left is rolled up to the telescope when the dish is lowered to the ground for engineers to work on the prime focus at the tips of the four support legs.

Credit: NRAO/AUI/NSF

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More Historical Radio Telescopes Images & Videos

Night Sky Over the 140-foot Telescope

Building the 140-foot Telescope at Green Bank

Drilling Bolt Holes on the 140 Foot Telescope

The second 85-foot telescope of Green Bank Observatory

Black and white image of the second 85-foot telescope

Hauling an 85-foot telescope around Green Bank

The third 85-foot telescope

Underside of the GBT

The National Radio Astronomy Observatory is a facility of the 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 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.