There could be a ninth planet in our Solar System after all - and no, it's not Pluto. Instead, it's the theoretical Planet X, also called Planet Nine, a wide-orbit planet that would circle the Sun ...

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This post was updated Nov. 20 at 8:23 p.m. In physics, the three-body problem describes how three planets tugging on one another with gravity slip into chaotic motion. With only two planets, the math ...