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The uncertainty of science: Astronomers think they have identified a warp in the Kuiper Belt that suggests a Mars-sized object exists there, affecting the orbits of surrounding objects.
According to the calculations, an object with the mass of Mars orbiting roughly 60 AU from the sun on an orbit tilted by about eight degrees (to the average plane of the known planets) has sufficient gravitational influence to warp the orbital plane of the distant KBOs [Kuiper Belt Objests] within about 10 AU to either side. “The observed distant KBOs are concentrated in a ring about 30 AU wide and would feel the gravity of such a planetary mass object over time,” Volk said, “so hypothesizing one planetary mass to cause the observed warp is not unreasonable across that distance.”
This proposed planet is not the theorized Planet Nine that other astronomers have proposed. That planet, which hasn’t been found and other data says doesn’t exist, would be much larger and much farther out.
I would add that neither of these proposed planets might exist. At this moment our data of the Kuiper Belt is very incomplete. I would not bet much on any theory that extrapolates planets from what we presently know.