Mar 12, 2025 · The existence of Planet X remains theoretical at this point. This hypothetical Neptune-sized planet would circle our Sun far beyond Pluto.

May 3, 2022 · According to NASA, “Caltech researchers have found mathematical evidence suggesting there may be a “Planet X” deep in the solar system. This hypothetical Neptune-sized planet orbits …

Jan 8, 2025 · Planet X, also called Planet Nine, is a hypothetical planetary body seven times the mass of Earth lurking behind Pluto.

Planet X, a hidden giant seven times Earth’s mass, challenges astronomers with its faint light and distant orbit, potentially redefining our understanding of the solar system.

Planet X is believed to be located somewhere within the Kuiper Belt, but other than many small body objects that have been located there so far, there has been no discovery of a planet-size object as of …

Jan 12, 2025 · Finding a planet so far from the Sun presents unique challenges. Unlike stars that emit their own light, Planet X would only reflect sunlight, making it exceptionally dim.

Apr 2, 2024 · Although they may sound like science fiction worlds, Planet X and Planet Nine are both hypothetical planets that have been thought to exist in our Solar System.

Sep 2, 2025 · The original “Planet X” concept, born from perceived gravitational anomalies of Uranus and Neptune, has been definitively disproven. Improved measurements showed earlier orbital …

May 28, 2025 · There could be a ninth planet in our Solar System after all — and no, it’s not Pluto. Instead, it’s the theoretical Planet X, also called Planet Nine, a wide-orbit planet that would circle the …

'Planet X' is the name given for a possible, as yet undiscovered ninth planet within our solar system that was recently theorized to exist.