It actually does not mean anything. Scientists use it to describe a planet that:
a) Should be there
or
b) Has been discovered but not named
Planet X was a hypothetical planet which was searched for after the discovery of planet Neptune. `Planet-X` does not exist.
No, Planet X does not exist.
No because it has no surface to stand on because it is a gas planet not a solid planet. If it was a solid and hard planet then yeah but it isn't
Planet x is the planet behind Pluto which is commonly reffered to as Selena but is not yet a planet(or clarified planet).
No
it is the planet you stand on, Earth
The name of planet X is Nibiru
There is no "Planet X". See links.
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.
Planet X was nothing because it does not exist and never did.
You could not survive on planet x. it is not possible