High Quality Content by WIKIPEDIA articles! XEUS is the X-ray Evolving Universe Spectroscopy space observatory that is being developed by the European Space Agency as a successor to the successful XMM-Newton X-ray satellite telescope. It consists of a mirror spacecraft that carries a large X-ray telescope, with a mirror area of about 5 m and an imaging resolution better than 5? for X-ray radiation with an energy of 1 keV. A detector spacecraft will fly in formation with the telescope at a distance of approximately 35 m, in the focus of the telescope. The detectors will include a wide-field X-ray imager with an energy resolution of 150 eV at 6 keV, as well as a cryogenic narrow-field imager with an energy resolution of 2 eV at 1 keV. XEUS will be able to measure the X-ray spectrum and thereby the composition, temperature and velocities of hot matter in the early universe.

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