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In January 2016, California Institute of Technology (Caltech) astronomers Konstantin Batygin and Mike Brown announced research that provided evidence for a planet about 1.5 times the size of Earth in the outer solar system.

Batygin and Brown nicknamed the hypothetical object “Planet Nine.” However, the notion of an undiscovered large planet in the realm beyond Neptune has been investigated multiple times in the past century, based on distinct lines of evidence. Sometimes it’s also referred to as “Planet X.”

The name Planet X was initially used for a hypothesis developed by astronomer Percival Lowell in 1915 to explain what might be perturbing the orbit of Uranus. The “X” is the letter x, not the Roman numeral for 10.

Reference: NASA