Jupiter

The largest planet, with more than twice the mass of all the others combined.

One origin story has Planet Nine as a fifth giant core scattered outward by Jupiter and Saturn.

Sources

1. Batygin & Brown 2016, Evidence for a Distant Giant Planet in the Solar System, AJ 151:22
2. JPL: Approximate positions of the planets (Standish, Keplerian elements J2000)

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