Building the GBT’s Azimuth Track
The Green Bank Telescope was constructed in the 1990s, beginning with its huge circular track and support. In this photo, an engineer is standing on one of the GBT’s four trucks that would eventually drive the 17-million pound telescope in a circle. Each truck has four wheels, meaning each wheel supports one million pounds. The track goes 25 feet into the ground to remain sturdy and level.