The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

The findings have revealed a lot about Ceres' origin. The dwarf planet stands out from all the others in the asteroid belt.

An international team of astronomers reports the detection of two new brown dwarfs orbiting distant stars using NASA's ...

wide dwarf planet may have originated at the outer edge of the solar system and may have migrated inwards to its current home ...

Clyde Tombaugh discovered Pluto in 1930 at Lowell Observatory in Flagstaff. Here's how Pluto won - and lost - its planetary ...

Saturn was already the reigning champion in the moon department. Now, with 274, Saturn has more moons than all the other ...

Together, dwarf planets can help scientists learn a lot ... 2015 RR245 is catalogued as the "18th largest" object in the Kuiper belt, according to the Minor Planet Center, the organization ...

A planet killer capable of ripping them to pieces has been discovered, say space scientists. Researchers believe they've found evidence that a white dwarf may have torn a Jupiter-sized planet apart.

New data from NASA's Chandra X-ray Observatory telescope and the European Space Agency's XMM-Newton satellite has shown that a planet may have been destroyed by a white dwarf—one of the dimmest ...

As the name suggests, a dwarf planet is smaller than a planet. Its force of gravity is not strong enough to pull in all the many other objects in its orbit around the Sun. Pluto is not very big.