Planet X is an informal name for the planet Pluto [See related question] however in later years it has come to be named as the hypothetical and 2012 disaster planet called Niburu [See related link].
Planet X was a hypothetical planet which was searched for after the discovery of planet Neptune. `Planet-X` does not exist.
Planet X does not exist - it was a hypothetical planet.
No, Planet X does not exist.
No
Planet x is the planet behind Pluto which is commonly reffered to as Selena but is not yet a planet(or clarified planet).
There is no "Planet X". See links.
The name of planet X is Nibiru
Nowhere. There is currently no planet called planet X. It is a lie
Planet X does exist but there are about 3 Dwarf planets that have simularities to Plznet X. Planet X has not yet been discovered.
There is no Planet X, so no, it did not.
Planet X does not exist.
Planet X was nothing because it does not exist and never did.