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physical object > natural object > celestial body > star > giant > blue giant

blue giant comparison table

Subject	is a kind of	has definition
giant	star	High-luminosity star that lies above the main sequence on the Hertzsprung-Russell diagram.
blue giant	giant	A giant star with spectral type O or B. Croswell, K. 1995 The Alchemy of the Heavens, Anchor Books

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