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.

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.

Pluto's five moons are its only moons. Of the 50 gigabits of data collected by New Horizons, only about 15 percent of has been downloaded to date. The New Horizons research team has its work cut ...

A team of scientists spotted evidence of relatively recent ice volcanoes on Pluto, advancing our understanding of the dwarf planet's surface-sculpting activities.

Artist’s impression of the dwarf planet Eris. ESO/L.Calçada and Nick Risinger Solar system leftovers. I’m a space scientist with a passion for astronomy and the exploration of the Solar ...

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.

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 ...

The International Astronomical Union has officially approved Kerberos and Styx as the new names for two of Pluto's moons. Image released on July 2, 2013. Dwarf planet Pluto is seen in an image ...

The mysterious Planet Nine may have up to 20 moons that could be superheated by the hypothetical planet's gravitational pull, making them easy to spot.