ROSAT was conceived with two tasks in mind; during the first six months following its launch on 1 June 1990, it would scan the full extent of the heavens with its Position Sensitive Proportional Counter (PSPC) detector equipment to complete the first ever all-sky survey using an imaging X-ray telescope. During this process, it detected and catalogued approximately 80,000 X-ray sources. Parallel to this, the UK Wide Field Camera recorded 6000 sources at the extreme ultraviolet end of the spectrum.
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