Planet 9
A possible ninth planet in our Solar System orbiting far beyond the dwarf world Pluto.
Scientists say that there are distinct alignments among some members of the Kuiper Belt - and in particular two of its larger members known as Sedna and 2012 VP113. These alignments, they argue, are best explained by the existence of a hitherto unidentified large planet.
Possible Planet 9 location
The Search for Planet X / Planet 9 / Nibiru
The Search for Planet Nine | Masao Sako