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A project of the European Space Agency for an orbiting X-ray astronomy observatory to be launched in 1999 with a minimum lifetime of ten years. The large collecting area, and the unprecedented sensitivity and resolution of its detectors, will reduce the time required to make an observation by a factor of over 100 and will allow many more spectra to be obtained than has been possible previously. The satellite will carry three identical telescopes, each consisting of 58 nested precision reflectors.
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