Green Bank Interferometer

The Green Bank Interferometer consists of three radio telescopes, each 85 feet (26 meters) in diameter, positioned along a 1.5-mile (2.4-kilometer) track. This arrangement lets researchers combine signals to create detailed observations of distant objects in space.

Operations began in 1964 with two telescopes, and a third was added in 1967 to expand research capabilities. This growth reflected the growing demand for more powerful tools to study the cosmos.

The facility takes its name from the surrounding area and represents a major center for radio astronomy research in the United States. Visitors can see how these instruments have shaped our understanding of distant space objects.

The telescopes can be repositioned along the track to adjust measurements and observe different areas of the sky. Keep in mind that the site remains active for research, so visitor access may be limited depending on ongoing observations.

The telescopes roll along the track on 80 truck tires, allowing for precise adjustments to the spacing between instruments. This practical engineering solution shows how researchers made the observatory adaptable for different types of observations.

Location: Pocahontas County

Part of: Green Bank Observatory

GPS coordinates: 38.43280,-79.83940

Latest update: December 10, 2025 20:06