For so many years I had heard reports of a mysterious 9th or 10th planet in deep space (if you still count Pluto as a planet) commonly referred to as “Planet X” or “Niburu” (var.Nibiru — meaning the bright star of the crossing).
Nibiru is also the name of a hypothetical planet proposed by Zecharia Sitchin, based on the idea that the ancient civilizations had made connections with extraterrestrials, a hypothesis considered unlikely by the majority of the scientists and historians. According to Zecharia Sitchin, this people knew all the planets of the solar system, including Nibiru, a slow planet that initially moved every 3,600 years (a period of time reduced to 3,450 years by gravitational dynamics of the Solar System). This Planet passes by the Asteroid Belt.
For most astronomers, the planet X hypothesis was largely rejected when the Voyager and Pioneer spacecraft missions allowed them to recalculate the masses of the gaseous giants and did not detect any strong gravitational pull beyond the orbit of Neptune.
In May 2012, Rodney da Silva Gomes, an astronomer at the National Observatory, proposed by revising orbital calculations that there is the possibility of a star four times larger and 1,5 thousand times more distant from the Sun than the Earth, interfering in Orbits of Kuiper belt objects.