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	The Four Great Observatories (NASA STI Program) View
	The Four Great Observatories (InceptionMoments) View
	History in a Hurry: NASA's Four Great Observatories (HistoryInAHurry) View
	The Four Great Observatories. (SPACEEFIED) View
	The Four Great Observatories - Nasa documentary (Space Resources) View
	15 BIGGEST Observatories on Earth (Top Fives) View
	Spitzer Space Telescope History And Mission Overview! (Insane Curiosity) View
	Spitzer Space Telescope - Our Infrared Eyes in the Sky (astris) View
	These Space Telescopes Were Built to See the Unseen (Factnomenal) View
	The Great Observatories - October 09 (Martin Mobberley) View