Each optical unit weighs 37 Kilograms. At the beginning of the orbital mission, the telescope will be aligned before starting science data acquisition. The optics have to be several meters away from the detectors to increase sensitivity. Long focal lengths are required to focus radiation in the X-Ray portion of the spectrum. Co-adding of the images is done on the ground during data processing. Previous Missions have flown mirrors with a single coating of Platinum, Gold or Iridium. Reflective elements and optics for focusing and imaging X-Ray Radiation were first invented by German scientist Hans Wolter in Common high-density materials are Tungsten and Platinum.
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