Akeno Giant Air Shower Array

The Akeno Giant Air Shower Array (AGASA) is a cosmic ray detector located near Akeno, Japan. It was built to study ultra-high-energy cosmic rays, which are high-energy particles from space that can reach the Earth's atmosphere. The array consists of a large number of detectors spread over a wide area and is designed to detect air showers—cascades of secondary particles that are produced when high-energy cosmic rays interact with the Earth's atmosphere.