Solar System has more than one “Planet X”?

Recent observations of the nearby (44 light-years away) multi-planet star system Upsilon Andromedae have kindled in my mind an intriguing question: ¬†Namely, can our own solar system have one or perhaps many “Planet Xs” hiding in oblique orbits? ¬†Allow me to explain. It has been known for quite some time that the Upsilon Andromedae star […]

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