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Nibiru is a mythical planet, sometimes called planet X, based on the old idea that irregularities in the orbits of the outer known planets could only be explained by the existence of a further, large, undiscovered planet.
However this idea, which started in the 19th Century, lost credence when it was found that the supposed irregularities were simply due to miscalculation of the real mass of Neptune.
Then when small objects began to be discovered in the Kuiper Belt beyond Neptune, the idea of Planet X reappeared. One of these objects was Eris, a bit smaller than Pluto, and too small to be a Planet X.
Modern telescopes and techniques have now all but ruled out the idea that Planet X exists.
Edit:Update: Using the latest sensitive observations NASA has discussed the possible existence of a "super-earth" very very far out in an extreme orbit. They have not found it, but say that the orbits of objects beyond the Kuiper Belt seem to suggest its existence.
according to current discovery (Neptune, Pluto & Uranus) are not planet but let me know according to indian astrology there are 9 planet but the planet which has been discovered as non planet by nasa is there anything writen anywhere that astrologers are talking about the planet among 9 planet is that the same planet which the nasa is talking about and also would like to make you aware that space craft known as puspak viman has been discovered where in india more that 5000 b.c that simply mean that we indian are more advance as per current technologies so definitely our ancient scientist who were called (Rissi) were aware of this discovery before and even though if they have describe about 9 planet that means 9 planet do exist and our current scientist and nasa had not yeat discovered it.
Never. It will always be the eighth planet (unless an impact by a large celestial body, possibly from the Kuiper Belt, knocks it closer to the Sun) as Pluto is not a planet.
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