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	Introduction to Astronomy : [Module 4] Topic 2: The Hydrogen Line (Academia) View
	Introduction to Astronomy : [Module 2] Topic 4: Proving a Theory False (Academia) View
	Intro2Astro: 21 cm line (Introduction to Astronomy Research) View
	Introduction to Astronomy : [Module 2] Topic 2: Scientific Theory (Academia) View
	Introduction to Astronomy : [Module 4] Topic 4: The Strange Force of Gravity (Academia) View
	Introduction to Astronomy : [Module 4] Topic 6: Testing Theories of Gravity: Pulsars (Academia) View
	Introduction to Astronomy : [Module 4] Topic 5: Pulsars and Black Holes (Academia) View
	Introduction to Astronomy : [Module 2] Topic 1: Making Sense of the Universe (Academia) View
	Introduction to Astronomy : [Module 4] Topic 7: Are We Alone (Academia) View
	Milky Way Introduction, Multiple Wavelengths, 21cm Line of Hydrogen (Greg Clements) View