Planet Nine — the undiscovered planet at the edge of the solar system — may be responsible for the unusual tilt of the Sun, according to a new study. The large and distant planet that was predicted to exist in January this year may be adding a wobble to the solar system, giving the appearance that the Sun is tilted slightly, researchers said. “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,” said Elizabeth Bailey, a graduate student at California Institute of Technology (Caltech) in the US. All of the planets orbit in a flat plane with respect to the Sun, roughly within a couple degrees of each other. That plane, however, rotates at a six-degree tilt with respect to the Sun — giving the appearance that the Sun itself is cocked off at an angle. Until now, no one had found a compelling explanation to produce such an effect. “It’s such a deep-rooted mystery and so diff...
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