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	Introductory Astronomy: Galaxy Classifications (Professor Paul Robinson) View
	Galaxy Classification (David Atlee) View
	Galaxies, part 1: Crash Course Astronomy #38 (CrashCourse) View
	Star Systems and Types of Galaxies (Professor Dave Explains) View
	Galaxies: Explained \| Astronomic (Astronomic) View
	The Classification Of Galaxies \| Astronomic (Astronomic) View
	Introductory Astronomy: Size Scale of the Milky Way (Professor Paul Robinson) View
	Classification of Stars: Spectral Analysis and the H-R Diagram (Professor Dave Explains) View
	Breaking News! NASA Reveals Astonishing Findings on the Andromeda Galaxy (CosmoDreams) View
	Classification of galaxies (Creative Ideas) View