There’s a new frozen oddball orbiting the Sun, and it’s not your average space rock. It’s a planet—a minor one, to be ...

Astronomers have identified a new trans-Neptunian object, 2017 OF201, located far beyond Pluto. Its enormous size, comparable ...

Possible New Dwarf Planet Spotted Near the Edge of the Solar System ... which means it experienced an interesting orbital migration path in the past," said astrophysicist Sihao Cheng of the ...

Scientists have identified an object about 435 miles (700 kilometres) wide inhabiting the frigid outer reaches of our solar ...

U.S. astronomers hunting for "Planet Nine" have instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches.

He’s involved in planning a mission to send a probe past ... do with Pluto. Should it be entered along with the other TNOs on the official list of our solar system’s “minor planets”?

At some point in the ancient past, the planet could have had an atmosphere roughly 40 times thicker than on Mars. In 2016, scientists announced that they might have spotted clouds in Pluto's ...

"It is potentially large enough to qualify as a dwarf planet. Its orbit is very wide and eccentric, which means it experienced an interesting orbital migration path in the past," said ...