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The Kuiper Belt and Oort Cloud
In some sense, earlier in the century, Pluto represented our ignorance about the edges of the solar system. Perhaps planet nine is the thing that represents our ignorance about now the modern set of ignorance about the edge of our solar system. We have a whole night sky of discoveries in the Kuiper Belt. If you do the exercise this way, the false alarm probability of the clustering on which the Planet 9 hypothesis is built is about 0.4%. Wow. That's a good way to put it.