No confirmed large planet beyond Neptune threatens Earth, though theories persist. The idea of Planet X—a large, hidden planet beyond Neptune—has been debated for over a century. Some astronomers have suggested that an undiscovered planet might exist in the outer solar system, influencing the orbits of distant objects. However, no direct evidence has been found.
A related theory involves Nibiru, a supposed rogue planet that some conspiracy theories claim is on a collision course with Earth. This idea has been widely debunked by scientists and was popularized by misinformation, not real astronomical observations. NASA and other space agencies have confirmed that no such planet is approaching Earth.
That said, astronomers are still searching for a possible Planet Nine, a hypothetical world far beyond Neptune. Some unusual movements of distant Kuiper Belt objects suggest that a massive planet could be affecting their orbits. If it exists, this planet would be located so far away that it would have no impact on Earth’s orbit or safety.
