Jonathan McDowell, an astronomer at the Harvard-Smithsonian Center for Astrophysics, ridiculed the idea of the rogue system.
He told Express.co.uk: ”I don’t know what to say except that it’s nonsense.”
Meanwhile Nasa’s leading scientist Dr David Morrison, said: “There is no credible evidence whatever for the existence of Nibiru. There are no pictures, no tracking, no astronomical observations.
“I can quite specifically say how we know Planet X or Nibiru does not exist and does not threaten the Earth.
“Firstly, if there was a planet headed into the inner solar system that was going to come close to the Earth, it would already be inside the orbit of Mars, it would be bright, it would be easily visible to the naked eye – if it was up there it would be easy to see it, all of us could see it.”