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Chandra Observatory may have discovered extra-galactic planet - SpaceFlight Insider
Light from the Void: Twenty Years of Discovery with NASA's Chandra X-ray Observatory: Arcand, Kimberly K., Tremblay, Grant, Watzke, Megan, Wilkes, Belinda J., Weisskopf, Martin C.: 9781588346698: Amazon.com: Books