Sednoids refers to a group of trans-Neptunian objects (TNOs) that have orbits significantly influenced by the gravitational pull of a distant, yet-to-be-identified planet, often referred to as "Planet Nine" or "Planet X." The name is derived from the first known member of this group, Sedna, which was discovered in 2003 and has a highly elliptical orbit that takes it far beyond the typical Kuiper Belt.
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