May 2015 - Zecharia Sitchin described Nibiru according to Sumerian cosmology as the planet. Nibiru is home to an alien race called the Anunnaki an extreme advanced extraterrestrial civilization. Researchers have talked about the possibility.
Nasa Sends Urgent 24th, 2017! Planet Nibiru is Very Close and Can Cause Catastrophic Disasters - YouTube
According to the Anunnaki themselves, our solar system has one more member, a huge planet that is orbiting the sun in a 3,600 years long ellipse. They called their planet Nibiru, which means "the planet
Planet Nibiru, the Miracle Staircase, and the Dogon - YouTube