Paneling the GBT
![GBT's backup structure and surface panels](https://public.nrao.edu/wp-content/uploads/2013/09/gallery-images-largeDish_large.jpg)
The backup structure of the Green Bank Telescope is a crisscross of beams that carries an array of 2209 small motors that support a 2.3-acre surface of aluminum plates.
Credit: NRAO/AUI/NSF
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