Cos-B vibration testing

Cos-B undergoing vibration testing at ESTEC. ESA's Cos-B, launched 9 August 1975, provided the first complete galactic survey in high-energy gamma-rays. Before this, the gamma-ray Universe had largely been invisible to astronomers. Designed for a 1-2 year life, it operated successfully until April 1982. [Image Date: 1997/11] [74.12.282-005]