DORNIER SPACE / SCIENCE PHOTO LIBRARY DORNIER SPACE / SCIENCE PHOTO LIBRARY
The main telescope of the ROSAT spacecraft being mated to its support structure. ROSAT (Roentgensatellit) is a German/UK/NASA X-ray and extreme ultraviolet (EUV) telescope in Earth orbit. Its X-ray imaging systems share a lens which consists of four concentric grazing incidence mirrors, with a focal length of 2400mm. A similar lens, of 525mm focal length, is used for EUV observations. ROSAT was launched on a Delta rocket on 1 June 1990, and is expected to detect over 100,000 new X-ray sources. The satellite was named after Wilhelm Roentgen (1845-1923), the discoverer of X-rays.
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