Planets beyond Neptune
Today, the astronomical community widely agrees that Planet X, as originally envisioned, does not exist. A number of astronomers have used the concept of Planet X to explain other anomalies observed in the outer Solar System. In popular culture, and even among some astronomers, Planet X has become a stand-in term for any undiscovered planet in the outer Solar System, regardless of its relationship to Lowell's hypothesis. Other trans-Neptunian planets have also been suggested, based on different evidence.