FILE - In this Nov. 16, 2013 file photo, the Large Millimeter Telescope stands on the summit of the Sierra Negra peak near the town of Atzitzintla, Mexico. Astronomers have become the latest victims of Mexico's violence with activities at the observatory being reduced because its staff has suffered so many crimes while traveling to the remote mountain site, researcher said Thursday, Feb. 7, 2019. (AP Photo/Dario Lopez-Mills, File)
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