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'''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 m² and an imaging resolution better than 5
XEUS will be able to measure the X-ray spectrum and thereby the composition, temperature and velocities of hot matter in the early universe. It will address diverse questions like the origin and nature of black holes, their relation with star formation, the evolution of [[baryon|baryons]] and the formation of the heavy elements in the Universe.
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