Discovered in 1930, Pluto was the ninth planet for over 75 years, orbiting at the chilly fringes of our solar neighborhood. But then scientists at the International Astronomical Union decided ...

Pluto was unseated as number nine in 2006 ... They theorized that a potential planet’s long orbit would enable them to see it move across the sky. They found 13 pairs of dots that could be ...

This range aligns with theoretical predictions for Planet Nine’s distance and mass, estimated between 7 and 17 times that of Earth . The researchers initially identified 13 candidate pairs showing the ...