Dwarf Planets

Pluto's 'almost twin' dwarf planet Eris has a rocky core blanketed by an icy shell, which appears to be flexing slowly.

Asteroid impacts on dwarf planet Ceres influenced the presence of organic aliphatic molecules, according to new research.

Dwarf planet Haumea reaches both opposition and perigee on April 20, making this a prime opportunity to see the dwarf planet in the night sky.

The dark skies of the new moon will offer skywatchers the chance to spot Ceres tonight (March 21), as the dwarf planet reaches opposition.

Astronomers interpret the spectra of 10 well-known dark asteroids and find them to be water-rich like the dwarf planet Ceres.

A mini-planet orbiting in the frigid outer reaches of the solar system has a Saturn-like ring of dust and debris that defies the rules of physics, a new study has revealed.

The dwarf planet Haumea may be the weirdest object in the solar system. Now NASA researchers may finally understand how it was formed.

With a worldwide shortage of plutonium-238, future planetary science missions are in jeopardy.

The United States has begun manufacturing nuclear spacecraft fuel for the first time in a generation, but full production of the stuff likely won't begin until 2023 at the earliest.

NASA had been splitting costs with the U.S. Deparment of Energy.