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This July 23, 2014 file photo shows the Milky Way galaxy on a moonless night from a cattle pasture in the Sand Hills of Nebraska. Our solar system lies at the edge of a structure called the Local Arm or the Orion Spur, and according to a paper released Wednesday, Sept. 28, 2016, researchers calculated that it stretches more than 20,000 light-years long, maybe about four times what scientists had thought before. (Photo by Travis Heying/The Wichita Eagle via AP Photo)
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