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+"Ninth Planet" describes a hypothetical celestial body theorized to orbit the Sun far beyond [Neptune](/wiki/neptune). Its presence is suggested by gravitational influences on distant trans-Neptunian objects, prompting an ongoing [Search](/wiki/search) for this unseen world.
+## See also
+- [Planet X](/wiki/planet_x)
+- [Kuiper Belt](/wiki/kuiper_belt)
+- [Outer Solar System](/wiki/outer_solar_system)