Ok, so you have posted a picture. It means nothing. Anyone can draw that.
What is the source of that picture? What ACTUAL evidence is their for such a body? For an orbit to be plotted that accurately the object must have been observed. Who observed, using what instruments and when?
I can answer all of these questions for you accept the source of the picture.
Q.What actual evidence is their for planet -X.
A. None.
Q. Who observed it.
A. No one.
Q. Using what instrument.
A. See above.
Q. When.
A. See above.
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You see the real difference between science and superstition is that superstition relies entirely on belief. Science relies on available evidence. That doesn't mean that the superstitious appraoch is always wrong or that the current scientific belief is always right, just that science is right faf FAR more often.
Science continues to ask questions. It is self doubting, self correcting. New ideas will emerge and challenge the old. The hypothesis that best fits the observed facts will be accepted whilst those that don't are rejected. As such science continually moves forward. Science is not about claiming that something is te absolute truth, it is a constant quest for the truth.
Superstition does not do this. It says, "this is how things are, this is the absolute truth". It ignores the observed facts when they don't fit the idea. It rejects reality in favour of unfounded belief. In this way superstition never moves forward. It drags mankind into the past rather than propelling him into the future.
It is for this reason that I say again, read some good science books. Learn to tell the difference between science and superstition.