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This image provided by NASA was photographed by the spacecraft Messenger, the first ever images made from a spacecraft while in orbit around the planet. It shows Mercury's horizon as the spacecraft was moving northward along the first orbit during which MDIS was turned on. On March 17, 2011 Messenger became the first spacecraft to orbit the planet Mercury. (AP Photo/NASA)

This image provided by NASA was photographed by the spacecraft Messenger, the first ever images made from a spacecraft while in orbit around the planet. It shows Mercury's horizon as the spacecraft was moving northward along the first orbit during which MDIS was turned on. On March 17, 2011 Messenger became the first spacecraft to orbit the planet Mercury. (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.