Where is Planet X located?

Perturbations in the orbit of the planets Neptune and Uranus point to the existence of Planet X in the region of the proto-planet Pluto. Planet X is beyond Uranus and Neptune and likely resides within part of the sky that hosts the constellations Scorpius or Taurus.

The fictional planet Nibiru is often assumed to be Planet X within the inner solar system, but this is impossible, according to Universe Today. It would shine too brightly and would have been seen by telescopes and possibly the unaided eye. Planet X is in the outer solar system and has a highly elliptical orbit that may bring it within Pluto's orbit as well as outside of it.