On the BUS
![Engineers maintaining the GBT's backup structure](https://public.nrao.edu/wp-content/uploads/2013/09/gallery-images-largeGBTcatwalktechs_large.jpg)
Telescope technicians carefully balance on the maintenance trusses to work on the Green Bank Telescope’s backup structure (BUS). The GBT’s 2.3-acre dish is supported by 7,652 pieces of steel welded and joined together in the complex framework. The BUS weighs around 2.3 million pounds. Keeping it strong and sound requires constant vigilance.
Credit: NRAO/AUI/NSF
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