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	Astronomy - Ch. 17: The Nature of Stars (22 of 37) Stellar Classification: Spectral Class (Michel van Biezen) View
	Astronomy - Ch. 17: The Nature of Stars (23 of 37) Stellar Classification: Spectral Class (Michel van Biezen) View
	Astronomy - Ch. 17: The Nature of Stars (21 of 37) Stellar Classification: Spectral Class (Michel van Biezen) View
	Astronomy - Ch. 17: The Nature of Stars (27 of 37) Stellar Classification: Luminosity Class (Michel van Biezen) View
	Astronomy - Ch. 17: The Nature of Stars (26 of 37) Stellar Classification: Examples (Michel van Biezen) View
	Astronomy - Ch. 17: The Nature of Stars (25 of 37) Stellar Classification: Luminosity Class (Michel van Biezen) View
	Astronomy - Ch. 17: The Nature of Stars (33 of 37) Determining Stellar Radii (Luminosity of Sirius) (Michel van Biezen) View
	Astronomy - Ch. 17: The Nature of Stars (28 of 37) Determining a Star's Luminosity (Michel van Biezen) View
	Astronomy - Ch. 17: The Nature of Stars (14 of 37) Apparent Magnitude: Another Look (Michel van Biezen) View
	Astronomy - Ch. 17: The Nature of Stars (30 of 37) Determining a Star's Luminosity (Rigel) (Michel van Biezen) View