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SCIENCEALERT STAFF Planet Nine - also referred to as Planet X - is a massive, hypothetical object in an elliptical orbit far beyond Pluto, roughly at a distance that would take 10,000 to 20,000 Earth years for it to complete a single trip around the Sun.    Though no direct observations have ever been made of an object fitting the description of Planet Nine, unexpected patterns in the orbits of other, smaller objects in the icy outer reaches of the Solar System could be explained by the gravitational pull of such a body. In early 2016, California Institute of Technology astronomers Mike Brown (famed for his role in demoting Pluto from its rank as the ninth planet in 2005) and Konstantin Batygin announced their observation of dwarf planet 2012 VP113 s orbit lining up uncannily well with the orbits of five other extreme trans-Neptunian objects.

Konstantin batyginMike brownCalifornia institute of technologySolar system originsPlanet nineSolar systemCalifornia instituteOuter solar system origins surveyமைக் பழுப்புகலிஃபோர்னியா நிறுவனம் ஆஃப் தொழில்நுட்பம்சூரிய அமைப்பு ஆரிஜிந்ஸ்கிரகம் ஒன்பதுசூரிய அமைப்புகலிஃபோர்னியா நிறுவனம்ஔடர் சூரிய அமைப்பு ஆரிஜிந்ஸ் கணக்கெடுப்பு