Three months ago I posted a Blog posing the question: Is the newly found Planet 9 an Exoplanet? http://www.solarancestor.com/weekly-bulletin/-is-the-newly-found-planet-9-an-exoplanet. Planet X’s theoretical orbital plane differs from other planets and it may have put them off their axes millennia ago. This would also suggest the planet doesn't originate from our Solar System, but it may be an exoplanet captured by the Sun. Prior to its discovery, the likely candidate to explain the spin alignment has been a passing star, or magnetic field interactions of the Sun and the disc from which the Solar System was formed in the early days. If this occurred then the planet's gravitational pull would cause the observed alignment of the planets' relative to the Sun. The most important aspect of the Planet X is its tilt - if it were the mass, then Jupiter might be suspected as a cause. But the perturbing planet is off-plane, and Jupiter cannot cause its own tilt.
Once the scientists at the California Institute of Technology in Pasadena suspected that Planet X might be the cause, the idea could then be applied to other planets as well. It’s one puzzle piece that seems to fit together, and it really seems to be in support of the Planet X hypothesis. According to the calculations, Planet X could weigh between 5 and 20 times the mass of Earth, with an extremely eccentric orbit that reaches 250 times the distance of the Sun and the Earth, at its farthest end. Such an orbit supports the idea that it was actually once an exoplanet before it got captured by our Sun.
Reference: "The inclination of the planetary system relative to the solar equator may be explained by the presence of Planet 9" - Rodney Gomes, Rogerio Deienno, Alessandro Morbidelli - arXiv:1607.05111 See: http://arxiv.org/abs/1607.05111
CREDIT for Image featured at top: Featured image credit: TheLipTV2