The newcomer replacing Pluto presently goes by “Planet Nine.” If and when it finally shows up, it will get the honor of a ...

In 2004, scientists found Sedna, a potential dwarf planet beyond the belt, had a strange orbit around the sun that hinted another large mass was gravitationally pulling it. A 2014 study found a ...

Moskowitz: Exactly. And then this is where the story starts leading toward the idea of Planet Nine because then they found this object called Sedna. [CLIP: “The Farmhouse,” by Silver Maple ...

For years, scientists have observed the Solar System’s outer reaches in search of a Planet Nine. While Pluto was demoted to dwarf planet status in 2006, some researchers believe an even larger ...