In recent years, there have been many speculative writings about Planet X, known in ancient times as Nibiru. Most of these writings are based on The Twelfth Planet by Zecharia Sitchin.
There are those who believe that the Anunnaki of Nibiru are coming back to Earth soon. They believe that Planet X is going to pass by Earth on its 3,600 year orbit around our sun. Such believers are terrified of the consequences that a close pass by Nibiru might bring. They fear this will cause earthquakes, tidal waves, severe flooding, food shortages due to climatic conditions, diseases, meteor fire storms, volcanic eruptions and the like. They are afraid of a catastrophic loss of life on Earth.
Connection Between The Mayan Calendar & the return of Nibiru
Planet X has been known by many names, called Nibiru (Ne.Bi.Ru) by the Sumerians, and Marduk by the Babylonians. In various cultures its name would translate as The Twelfth Planet, Paradise, Heaven, and the Kingdom of the Heavens. The Sumerians referred to it as the Twelfth Planet, but it is believed by current scholars to be a wandering planet from another solar system whose star has been extinguished, drifting until captured by our sun, and pulled in gradually. It loops our Sun in an eccentric 3600 year orbit, coming close to the Sun and the Earth at one end of this gigantic ellipse and then traveling far into interstellar space before returning again more than three millennia later. Interpretations of writings on clay tablets indicate the Sumerians thought it was a "heaven" where their gods came from and would return to as their home.
Nibirians, the people of Nibiru, brought here to reside on the Earth and dominate and modify humanity for their own purposes, were called the Anunnaki by the Sumerians, literally "those who came from heaven to earth". In Hebrew writings they are referred to as the Nephilim, or Elohim (gods). In the Old Testament these "heavenly" visitors are called "Anakim".
The mythology attributes god-like powers to the Nibirians, yet they were similar enough to humans to be able to interbreed after some genetic modification, so their descendants would remain in positions of authority over humans. This implies some common ancestors, that we are somehow related to the Anunnaki or that life on our two planets somehow arose from a common source. Though technically advanced and perhaps much larger in stature (they are often regarded as "giants" in the ancient record) they looked pretty much the same as humans. Only roughly similar DNA could be tweaked sufficiently to allow successful cross-breeding. These earliest written records of the Sumerians assume that their kings are descended from these "heavenly" visitors, and used this lineage to justify the continuation of their dynasties for centuries.