It must have cleared all other celestial bodies, except its own moons, from its orbit.

In the time Pluto was found, classified as a planet and reclassified as a dwarf planet, it has not completed one orbit. One ...

Previous observations suggested that Ceres was less than 30% ice, and its craters were thought to imply that the dwarf planet ...

On a small dwarf planet called Makemake, astronomers have seen signs of surprising temperature changes. These could indicate ...

A ninth planet may exist beyond Neptune in the Kuiper Belt, a region populated by icy bodies that orbit the Sun.

Although Pluto's orbit was more elongated than the other planets' (and even crossed ... Union in 2006 recommended that they be called "dwarf planets"—much as asteroids are sometimes called ...

The solar system has nine planets, but in 2006 the International Astronomical Union declared Pluto a dwarf planet, making the ...

Within GRAVITY’s combined observations, Xuan’s team discovered that Gliese 229 B was not a single object, but a pair of brown ...

Famously, Pluto no longer met the criteria and was demoted to a dwarf planet ... a really wonky orbit and was far smaller than the other planets, so it didn't take long for astronomers to start ...

Only one other pair of brown dwarfs are known to ... But they are more massive than the biggest planets. "A brown dwarf is an object that fills the gap between a planet and a star.

A distant white dwarf hosts an Earth-like planet in an orbit that might be similar to Earth’s if it survives the Sun’s red giant phase.