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At the edge of the solar system, beyond the orbit of Neptune, lies an expansive field of icy debris known as the Kuiper belt. The orbits of the individual asteroid-like bodies that make up the Kuiper belt trace out highly elongated elliptical paths, and require hundreds to thousands of years to complete a single revolution around the Sun. Remarkably, the most distant members of this belt exhibit an anomalous orbital alignment. In this talk, I will argue that the observed clustering of the distant solar system is maintained by a yet-unseen, Neptune-like 9th planet. The existence of such a planet naturally explains other, seemingly unrelated dynamical features of the solar system.

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