Planet Nibiru is known by many names, such as: Planet X, The Twelfth Planet, Marduk, Paradise, "Heaven" and the "Kingdom of the Heavens". Although Nibiru has been called The Twelfth Planet, technically it is not a planet of our solar system. In fact, it is a planet from another solar system and the star that was the sun of its solar system has been extinguished. Nibiru was never visible from the Earth but the star which was the centre of Nibiru’s solar system was visible in the skies from Earth. The orbiting pattern of Nibiru gave the Anunnaki the advantage of having a mobile observatory from which they could observe and investigate many other planets near it.
Planet X is known as Nibiru in Sumerian, and Marduk in Babylonian. It has been said that the ancient Mesopotamians believed that Nibiru was the twelfth planet in our solar system and that it was "heaven" where their gods resided and came from.
Nibirians, the people of Nibiru, are often referred to as the Anunnaki, Nephilim, Elohim (plural for god), and Mardukians. The word "Anunnaki" literally means "those who came from heaven to earth". In the Old Testament these "heavenly" visitors are called "Anakim".
Planet Nibiru's origin comes from clay tablets found during the past 100 years. These tablets, dated 2,500 B.C. clearly show our solar system with great accuracy. These pictures, from the Sumarians lay out our solar system with the planets, sun and sizes that have been proven today. How were they able to do this?
Pluto was not discovered until 1930.
Some people believed that Nibiru would pass by Earth in 2003. The expected date now is 2012 though no one knows for sure.