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EXOSATEuropean X-Ray Observatory Satellite (European Space Agency)
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24-m UK Schmidt telescope operational at Siding Spring, Australia (1973) 40 Official opening of the Sutherland observing site of the SAAO (1973) 40 Skylab space station launched (1973) 30 IRAS (Infrared Astronomical Satellite) launched (1983) 30 EXOSAT (European X-ray Observatory Satellite) launched (1983) 20 VLBA (Very Long Baseline Array) begins operation (1993) 20 ASCA (Advanced Satellite for Cosmology and Astrophysics) launched (1993) Key: y.
This discovery was made possible by new SAAO and Southern African Large Telescope (SALT) observations combined with archival data spanning 27 years, gathered from multiple observatories and satellites including the HST (Hubble Space Telescope), EUVE (Extreme Ultra-Violet Explorer), SWIFT (The Swift Gamma-Ray Burst Mission), XMM-Newton (is ESA's X-ray space observatory), ROSAT (ROentgen SATellite, was an X-ray observatory) and EXOSAT (was the ESA's X-ray Observatory).
During the past 15 years, several sounding rockets, both Voyager space-craft, and the X-ray satellite EXOSAT have all viewed stars in the extreme ultraviolet.