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This composite image provided by NASA, created this month, taken by NASA's Chandra X-ray Observatory and other telescopes, shows a galaxy where a recent supernova probably resulted in a black hole in the bright white dot near the bottom middle of the picture. (AP Photo/NASA)

This composite image provided by NASA, created this month, taken by NASA's Chandra X-ray Observatory and other telescopes, shows a galaxy where a recent supernova probably resulted in a black hole in the bright white dot near the bottom middle of the picture. (AP Photo/NASA)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.