If Planet X existed,would it undermine the known laws of physics?

Answer 1

If it exists, it's hiding pretty good that's for sure

Answer 2

Planet X disproved

The distant space probes Pioneer 10, Pioneer 11, and Voyagers 1 and 2 disproved the existence of Planet X, as hypothesized by Lowell, in two ways. First, as they passed each of the outer planets, the acceleration gained by the gravitational pull of the planet was used to refine the masses of those planets. It turned out that the masses of the outer planets, calculated by Earth-based observatories, were low by as much as 1%. When the correct masses were used to determine the orbits of the outer planets, the remaining discrepancies vanished.
Second, the trajectories of the space probes have revealed no discrepancies that can be accounted for by the gravitational pull of a large undiscovered object in the solar system. Many astronomers consider this the end of the Planet X hypothesis. This does not preclude the existence of objects potentially as massive as the Earth, which could escape detection in this manner, and would not create noticeable discrepancies in the orbits of the outer planets. Such an object could be considered "Planet X" only in the popular sense, not in the scientific sense.

Answer 3

Are you speaking of the theory that it's orbit is in a different axis than the other planets, say vertically as opposed to horizonally?

Answer 4

Your question does not provide enough information to give you an answer.

Answer 5

not accordingto the string theory, it would be mroe evidence

Answer 6

No it would exspand.

Answer 7

ABSOLUTLY NO.