Planet Nine has always been a mystery. No researchers have been able to provide theoretical evidence to support its existence, which is quite controversial. The astronomers have tried to explain the unusual clustering orbits of the icy asteroids located in the Kuiper belt, at the edge of the Milky Way, basing it on the existence of Neptune.
The Kuiper Belts is an assembly of small, icy bodies that unusually orbit the Sun at a distance of 30AU. The AU is the abbreviation of one astronomical unit that measures the distance between the Sun and its orbiting objects. Its length is around 2,000 kilometers, and the small Kuiper Belt objects are pieces of planetary material that failed to incorporate into planets, bearing a striking resemblance to an asteroid belt.
The data provided by the Outer Solar System Origins Survey has proven to be extremely useful. In theory, the icy objects have an elliptical and tilted orbit, reminding of Pluto. The mathematical analysis had shown that the KBOs orbits had been formed when Neptune was located closer to the Sun than it is today.
Therefore, the extreme orbits are supporting the existence theory of a so-called “Planet Nine.” When researchers found that a couple of icy planetary objects were oriented differently, they soon realized that something is not working according to the plan in the area. Then, they calculated how the presence of a planet would affect the orbiting process of the icy objects.
That was the moment when the Planet Nine theory was born, though to be ten times bigger than our planet, having an orbit at around 300-700 AU. Four years of research have gone by, and nothing seemed to prove Planet Nine’s presence in the Kuiper Belt. Therefore, if the theory cannot be supported by detailed observations, there might not be a Planet Nine in the end.