And then there’s the real ninth planet.
The last known 9th planet of the solar system was Pluto. Until it was dislodged from that classification due to some strict criteria. ‘Disgraced’ Pluto, now a minor planet (134340 – Pluto) in the system lies in the Kuiper Belt beyond Neptune.
It is still the largest and second-most-massive known dwarf planet in the Solar System and the ninth-largest and tenth-most-massive known object directly orbiting the Sun. But it is about one-sixth the mass of Earth’s Moon and one-third its volume.
After 1992, its status as a planet fell into question following the discovery of several objects of similar size in the Kuiper belt. In 2005, Eris, which is 27% more massive than Pluto, was discovered, which led the International Astronomical Union (IAU) to define the term “planet” formally for the first time the following year. This definition excluded Pluto and reclassified it as a member of the new “dwarf planet” category (and specifically as a plutoid)
So much for Pluto, then. Here’s the ninth ‘new’ planet. Based on the new theory that the real ninth planet lurks hidden yet revolving around our sun in a really weird way, different from all other celestial bodies, including the moons.
H/T: Photo grab from Caltech Youtube video.