Dwarf Planets

The pull of Ceres on NASA's Dawn spacecraft hints at an ancient ocean that may have left traces today.

NASA's Dawn spacecraft has been granted a mission extension that will allow it to continue to study the dwarf planet Ceres until it runs out of fuel sometime in 2018.

Scientists have discovered a ring system around the dwarf planet Haumea.

The dwarf planet 2007 OR10, informally known as "Snow White," has a moon that's between 150 miles and 250 miles (240 to 400 kilometers) wide, a new study reveals.

The dwarf planet Ceres shines and spins in a new video captured by NASA's Dawn spacecraft.

NASA's Dawn spacecraft has lost another orientation-maintaining reaction wheel, but the failure doesn't threaten the probe's continuing work at the dwarf planet Ceres, agency officials said.

New observations reveal that the far-flung object 2014 UZ224 (informally known as DeeDee, for "Distant Dwarf") is about 395 miles (635 kilometers) wide — big enough to claim "dwarf planet" status.