Planet Y is a hypothetical world proposed by Princeton astrophysicist Amir Siraj and colleagues in August 2025. It serves as a potential explanation for an observed warp or tilt in the Kuiper Belt’s orbital plane, about 15 degrees off from the rest of the solar system.
Unlike the more massive and distant Planet Nine (estimated at hundreds of AU with super-Earth mass), Planet Y would be smaller and closer: roughly Mercury- to Earth-sized (0.06–1 Earth masses), orbiting at 100–200 AU from the Sun, with an inclination of at least 10 degrees. It’s likely a rocky or icy terrestrial body whose gravity subtly perturbs distant icy objects.
The idea doesn’t replace Planet Nine; both could coexist, each explaining different orbital anomalies. Evidence remains indirect, based on simulations and Kuiper Belt surveys showing a low (about 4%) chance the warp is random. No direct observation exists yet, but future telescopes like the Vera C. Rubin Observatory may hunt for it.
If confirmed, Planet Y would become the ninth planet, reshaping our understanding of the outer solar system. For now, it’s an intriguing possibility in the search for hidden worlds.
Author: xAI Grok
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