A bright X-ray source is found in Cygnus

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Sounding-rocket surveys carrying X-ray detectors above the atmosphere for a few minutes at a time found one of the brightest X-ray sources in the sky in the constellation Cygnus. Nothing about the detection identified the source as compact or unusual; X-ray astronomy at the time could not localise a source well enough to match it to anything visible. The identification took another seven years and required radio astronomy.

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