Researchers have discovered evidence about the existence of the 9th planet.

.

Researchers have discovered evidence about the existence of the 9th planet. 

Is Planet X discovered?

The evidence of Planet X or the "Distant Ice Giant" has been kicked out from the solar system by unknown forces. Was there the eruption in the young sun, what caused the shock wave, what would move that object away from other planets? So was the sun in its younghood the spectral class F-star, what has just blown some part of its mass away? 

Or was some other invisible object travel through the solar system, and the other star pulled that planet away from the normal area, where the planets are? In one of the most interesting visions, the sun was heavier than the star, which traveled through our solar system, and then it pulled Planet X to orbiting our sun in great distance.

Is Planet X from another solar system? 

Is the reason for the fall of Uranus and the strange trajectory of Neptune Planet X? In this theory, Planet X or Planet 9 arrived in the solar system in the trajectory, what goes between Saturn and Uranus. Then the Uranus and Neptune that were in the same direction acted as the gravity sling, which turned Planet X outside the solar system. The effect of the gravity was too weak, that the planet remains in the orbital trajectory of the Sun. But the trajectory is so far, that the ice giant is hard to detect. 

When Planet X has traveled away from the solar system the gravity of all planets caused that the planet remained in its distant trajectory. If Planet X is from another solar system it might offer a unique possibility to see what the exoplanets might look like. And if it has the moon or many moons, that thing offers the freezer, where are stored molecules from another solar system. 

Maybe that star was some red dwarf, and the gravity of the sun just pulled that planet away from its orbiter. But another very fascinating theory goes that planet X was the rogue planet, which has been push away from the orbital trajectory when its sun has exploded. The common thing in those theories is that the thing, what has caused the strange trajectory of planet Neptune and the fall of planet Neptune was planet X, not any star. 

Sources: 

https://www.foxnews.com/science/9th-planet-discovered-researchers-find-evidence-of-lost-planet-in-the-solar-system

https://www.sciencealert.com/nasa-needs-your-help-finding-mysterious-planet-nine

Image: https://www.sciencealert.com/nasa-needs-your-help-finding-mysterious-planet-nine