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From Uranus' orbit we concluded there must be another planet beyond Uranus, eventually discovered and named Neptune. The same happened when Pluto was about to be discovered (though on false premises).

  • Now, is the search after another planet since 2016 a similar story, or would that planet only provide an explanation how the orbits may have formed? In other words, if the mass (planet or black hole) suddenly disappeared, would it change anything in Sedna's orbit? If so, how would it change?
  • If it's a similar story as with the discoveries of Neptune and Pluto, can we assume the mass is a tiny black hole rather than a planet, as we probably would have found the planet more than five years after its proposition?
  • When will everyone definitely dismiss that such planet exists, and when will everyone dismiss the possibility of a black hole there (probably much later)?
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