No one is sure of the location of Nibiru or whether it actually exists. Nibiru has never been seen, and there is no scientific or astronomical evidence of its existence as of 2015. Sometimes referred to as Planet X, Nibiru is an alleged planetary mass beyond Neptune.
Nibiru supposedly appears in this part of the solar system every 3,600 years. Astronomers beginning with the ancient Sumerians have forewarned that Nibiru is on a collision course with Earth and have predicted a doomsday destruction of the planet on numerous occasions. Subscribers to these theories claim that a collision between Nibiru and a planet called Tiamat between Jupiter and Mars resulted in the creation of Earth and the asteroid belt. However, NASA scientists state that there is no factual basis for these claims and dismiss them as fictitious.