“Because Pluto is rotating rapidly prior to the collision, and because Charon lies mostly outside of their corotation zone, ...

NASA’s shocking claim hints at a hidden planet, possibly 10 times Earth's size, or a primordial black hole. Gravitational ...

Planet Nine is a theory about a massive planet that could ... It would prove that there’s a ninth planet out there, while also helping us understand how planets form, particularly the ones ...

Astronomers are searching for a potential ninth planet, known as Planet Nine, which could reshape our understanding of ...

Pluto, considered the ninth planet in our solar system until it was reclassified to dwarf planet status in 2006, is thought to have undergone an impact that broke off the largest of its five moons ...

The theory is testable. If astronomers can find a cluster of TNOs at about 150 Earth-sun distances then they could be considered signatures of the existence of a ninth planet in the solar system ...

Astronomers believe that our solar system may still hold surprises, with ongoing efforts to find a hidden ninth planet ... Batygin have been working on the theory since 2014, inspired by Sheppard ...