ROSAT being checked out prior to launch. ROSAT (Roentgensatellit) is a German/UK/NASA X-ray and extreme ultraviolet (EUV) telescope in Earth orbit. The large blue 'sails' are ROSAT's solar panels in the deployed position. 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 (1843-1923), the discoverer of X-rays.
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