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 ...

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

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

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 ...

Earth-like exoplanets (planets orbiting stars other than our sun ... are all thought to have saltwater oceans buried under icy shells. Dwarf planets Pluto and Ceres are also suspected of having ...

Perhaps future studies of dwarf planets like Ceres, and the life-building blocks and organic material on Mars and other planets could help us better understand how life expanded through our universe.

Opinions expressed by Forbes Contributors are their own. Jamie Carter is an award-winning reporter who covers the night sky. Computer simulations suggest that there is an undiscovered Earth-like ...

Unlike the other planets, Uranus spins on its side ... The largest object is the asteroid belt is the dwarf planet Ceres, which is 950km in diameter (that's about the same the length as Great ...

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 ...