XMM mirror module

The flight model of XMM's third mirror module (FM3), with its 1.49 keV calibration image at top right. ESA's X-ray Multi-Mirror (XMM) high-throughput X-ray spectroscopy mission will be launched by Ariane-5 in 1999. XMM will carry three mirror modules, each comprising 58 thin gold-plated nickel nested mirror shells of 300-700 mm diameters. [Image Date: 1998/01] [98.04.005-001]