Busy Little Robots
![GBT surface panels and actuators](https://public.nrao.edu/wp-content/uploads/2013/09/gallery-images-largeG.T.ACT_.02_large.jpg)
Each of the Green Bank Telescope’s 2004 surface panels is adjusted by a small, computer-controlled motor called an actuator, seen here at the edge of the dish. The 2.3-acre surface of the GBT requires 2209 actuators to maintain its accurate surface shape.
Credit: NRAO/AUI/NSF
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