Planet X has never been seen - largely because it does not exist.
The term "Planet X" originally referred to a hypothetical planet that lay beyond the orbit of Neptune. Due to what seemed to be irregularities in the orbit of Uranus and Neptune, astronomers, such as Percival Lowell, theorized that yet another large planet must lay even further out, causing the anomaly. The later discovery of Pluto seemed to justify the idea, but it was eventually determined to be too small to affect the gas giants. Data from the Voyager 2 mission finally put the idea of Planet X to rest when it was shown that the seeming anomalies in the orbits were due to astronomers underestimating how large Neptune was.
what planet can be seen from earth
This is impossible to answer for a planet with unknown conditions or characteristics.
"Planet X" was originally a term for a hypothetical TENTH planet, BEYOND Pluto. Also, Pluto is no longer considered a planet.
In order to calculate that figure, we need to know the mass of planet x and the radius of its surface. These are particularly difficult to measure in the case of planet x, primarily because it doesn't exist.
Planet X has not been confirmed to exist, so its size is unknown. Jupiter is the largest planet in our solar system, with a radius of about 69,911 km.
Yes, many people have: it is visible to the naked eye.
Both Venus and Mercury have no confirmed moons. All other planets have at least one.
Since we never seen Planet X, we don't know for sure. Astronomers are estimating its orbital period to somewhere between 10,000 to 20,000 years.
Planet X was a hypothetical planet which was searched for after the discovery of planet Neptune. `Planet-X` does not exist.
what planet can be seen from earth
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
Stranger Planet (Strange Planet, #1/2)
Nowhere. There is currently no planet called planet X. It is a lie