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Zagedan Valley with the mountain cirque and high-altitude lakes formed by ancient glacial erosion. Zagedan Ridge, Karachay-Cherkessia, Caucasus Mountains.
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About 12 billion years ago, a dwarf galaxy known as LKH collided with a young Milky Way and merged with it. This artist’s concept portrays that collision. NASA’s Hubble Space Telescope uncovered definitive evidence of this collision by studying globular star clusters.
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