Dwarf Planets

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.

NASA is facing a plutonium shortage that may thwart future missions.

The Department of Energy has made its first plutonium-238 in a quarter century.

A rare type of plutonium has been found in the crust below the deep sea, offering new clues as to how heavy metals form in star explosions and mergers.