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KRF7HD IDL TIFF file Quasar 3C 273
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3B2EKYE Mar. 22, 2012 - Quasars - The most mysterious celestial objects known to man are quasars (for quasi-stellar radio sources). U.S. scientists have found for the first time a quasar that emits X rays. The quasar, known as 3C-273 (lower left), is the most powerful X-ray source ever discovered. These four quasars were photographed through the 200-inch (508-centimeter) Hale telescope at Mounth Palomar in California. (Credit Image: © Keystone Pictures USA/ZUMAPRESS.com)
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