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Reference.org
Luminous blue variable
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<p>Luminous blue variables (LBVs) are rare, massive, evolved stars that show unpredictable and sometimes dramatic variations in their spectra and brightness. They are also known as S Doradus variables after <a href="/facts/S_Doradus/UV1pUBHg">S Doradus</a>, one of the brightest stars of the <a href="/facts/Large_Magellanic_Cloud/7VYAehNa">Large Magellanic Cloud</a>. </p>