An extremely massive, hot, and luminous star with surface temperatures of 20,000-50,000K that appears blue in color. These are among the most massive stars known, typically 20-90 times the mass of the Sun.
From Old French 'bleu' (blue) + 'super' (Latin for above/beyond) + 'gigant' (from Greek 'gigas', meaning giant). The term emerged in the early 20th century as astronomers classified stars by color, size, and luminosity.
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