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	Introductory Astronomy: Galaxy Classifications (Professor Paul Robinson) View
	Introductory Astronomy: Galaxy Distances and Lookback Time (Professor Paul Robinson) View
	Galaxies, part 1: Crash Course Astronomy #38 (CrashCourse) View
	Introductory Astronomy: The H-R Diagram (Professor Paul Robinson) View
	Classification of Stars: Spectral Analysis and the H-R Diagram (Professor Dave Explains) View
	The Classification Of Galaxies \| Astronomic (Astronomic) View
	Properties of Galaxies \| Introductory Astronomy Course 9.06 (Teach Astronomy) View
	Galaxies: Explained \| Astronomic (Astronomic) View
	Lesson 26 - Lecture 1 - Galaxy Types - OpenStax (Introduction to Astronomy) View
	Galaxy Classification (David Atlee) View