According to astronomers, aside from the original eight planets of the solar system, there are two other planets that lie just beyond the orbit of Pluto.
The official planets of the solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and lastly Neptune. The definition of the word “planet” was changed so Pluto is no longer qualified to be called such.
Spanish and British astronomers alike have claimed that there are at least two other planets that can be found beyond Pluto. These claims are based on the findings and calculations that is an unusual behavior in the orbit of distant space rocks called ETNOs or extreme trans-Neptunian objects.
These ETNOs are supposed to be dispersed in a band after 150 Astronomical Units from the Sun. Astronomical Units or AU is used to measure the distance in the solar system. However, observations show that ETNOs behave in the opposite way. The ETNOs are scattered too far away from each other, about 150 to 525 AU in distance and has a different orbital plan than that of the solar system.
To explain this strange behavior of ETNOs, British and Spanish studies suggest that there may be some very large objects that are affecting and dictating the gravitational force of the ETNOs. These large objects in space may be planets.
Some invisible forces may be altering the behavior and direction of the ETNOs, leading the astronomers to believe more planets may lay beyond Pluto’s orbit. Currently, it is still uncertain of the number of possible planets are correct. So far, all they can do is observe and study the behavior of celestial bodies.