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Ed Lu, Chairman of the B612 Foundation, shows a model Thursday of the Sentinel Space Telescope. A group of ex-NASA astronauts and scientists plan to launch the telescope to search for asteroids that may pose a danger to Earth. (Associated Press)

Ed Lu, Chairman of the B612 Foundation, shows a model Thursday of the Sentinel Space Telescope. A group of ex-NASA astronauts and scientists plan to launch the telescope to search for asteroids that may pose a danger to Earth. (Associated Press)

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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.