Space Daily: The large and distant planet may be adding a wobble to the solar system, giving the appearance that the Sun is tilted slightly. via SPX
'"Because Planet Nine is so massive and has an orbit tilted compared to the other planets, the solar system has no choice but to slowly twist out of alignment," says Elizabeth Bailey, a graduate student at Caltech and lead author of a study announcing the discovery.
'The next question, then, is how did Planet Nine achieve its unusual orbit? Though that remains to be determined, Batygin suggests that the planet may have been ejected from the neighborhood of the gas giants by Jupiter, or perhaps may have been influenced by the gravitational pull of other stellar bodies in the solar system's extreme past.'
"Solar Obliquity Induced by Planet Nine" by Elizabeth Bailey, Konstantin Batygin, and Michael E. Brown here