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The Outer solar system Origins Survey (OSSOS) is a survey searching for trans-Neptunian objects (TNOs), i.e., minor planets orbiting beyond Neptune. It is performed with the Canada-France-Hawaii Telescope MegaPrime 1-square-degree imager, regularly observing 21-square-degree regions over 16-month periods. It was begun in 2013 and in 2017, 8 such regions had been surveyed, with over 800 objects were discovered. Observation was designed to allow extrapolation of overall population statistics.