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![Array of beams and motors that support the GBT's surface panels](https://public.nrao.edu/wp-content/uploads/2013/09/gallery-images-largeConst_2_large.jpg)
The backup structure of the Green Bank Telescope is an engineering marvel. This crisscross of beams carries an array of 2209 small motors that support the GBT’s 2.3-acre surface of aluminum plates.
Credit: NRAO/AUI/NSF
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