The Great Big Thing
![The Great Big Thing](https://public.nrao.edu/wp-content/uploads/2013/09/gallery-images-largeGT.GBT_.Full_.085_large.jpg)
The Green Bank Telescope is 485 feet high. It weighs 17 million pounds and has a dish 2.3 acres across. The GBT is the largest moving structure on land, and the largest fully-steerable telescope in the world. It was completed in 2000 and remains the most accurate and versatile large single-dish telescope in use today.
Credit: NRAO/AUI/NSF
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