The elusive "Planet Nine," which may or may not lurk in the outer reaches of the solar system, could be surrounded by a small swarm of potential moons, a new study reveals.

A dwarf planet called 50000 Quaoar that orbits beyond Neptune appears to have a ring that shouldn't be there, at 7.4 times more distant than the planet's radius.

Saturn, the giant planet known for its rings, is now being celebrated for having the highest number of moons in the solar system – 145 total, after gaining 62 additional moons in May, according ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

Dwarf planet Eris’ rotation is constrained by its large moon Dysnomia, named after the Greek goddess of lawlessness. Skip to main content Thank you for visiting nature.com.

Among the quirky characteristics of this distant dwarf planet are its moons and the way they orbit Pluto. Actually, it's more precisely the way they do not orbit Pluto because they don’t.

The dwarf planet Makemake, which chills out in the deep freeze of the outer Solar System, might be home to an ice volcano 1. Makemake is one of many icy worlds that orbit the Sun past Neptune.