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Musca (abbreviation Mus, genitive Muscae) is one of the minor southern (declination -70 degrees) constellations. It contains the soft X-ray transient Nova Muscae 1991. Nova Muscae 1991 which is a binary star where one of the stars is a black hole. During the 1991 outburst, radiation produced by positron annihilation[?] was detected from Nova Muscae.

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