For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...

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

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

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

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 ...

Gonggong is a dwarf planet and a member of the scattered disc beyond Neptune. As of 2019, its distance from the Sun is 88 AU, and it is the sixth-farthest known Solar System object.

TRAPPIST-1 is a red dwarf star about 40.7 light-years away from Earth. It is of particular interest because it has seven ...

“New Horizons shattered a major paradigm of planetary science,” says Alan Stern, the mission’s principal investigator. “Pluto turns out to have as much complexity as Mars or Earth, so much so that I ...

A decades-old cosmic mystery may finally be solved. Scientists now suspect that the strange X-ray glow from a distant white ...

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 ...