Sednoids at the Edge: Clues from the Solar System's Distant Frontier

We explore Sednoids—detached, highly elongated trans-Neptunian objects whose orbits sit far beyond Neptune. We unpack why their orbital orientations resist easy explanations, review the leading ideas for their origin (stellar flybys, interstellar capture, or a hidden Planet Nine), and discuss how the four confirmed members—Sedna, 2012 VP113, Lele Ekohonoa, and 2023 KQ14—might preserve a fossil record of the Sun's birth environment and the outer solar system's mass.

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