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An Undiscovered Ninth Planet in our Solar System?
Question: What about [suggestions] of a possible undiscovered ninth planet (dwarf or) in our solar system? — Anton
Answer: The undiscovered ninth planet that you are referring to has recently been theoretically predicted to exist. There are no actual measurements of this theoretical ninth planet. Those theoretical predictions, though, can tell astronomers where to look for this potential new neighbor.
Jeff Mangum