The existence of Nibiru or Planet X as it is often called, is fueled by much anticipation and clues found in ancient mythology and more recently with reported sightings, new evidence and previously undisclosed archives being made public.
The planet Nibiru was described in a series of books by Zecharia Sitchin, after he studied the mythological writings of the ancient Sumerians.
Sumerian mythology tells of a planet that comes near to Earth once every 3,600 years on an extremely long orbit around our sun. More recently Planet Nibiru has also come to be called Planet X, or The Twelfth Planet by Astronomers or Astrophysicists. Some people believe that, as Sitchin's writings tell, the planet Nibiru was populated by a race of beings called the Anunnaki, who genetically manipulated mankind and created man as we are today.