A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

There’s a new object in the distant reaches of our solar system, and it might just offer clues to a long-standing cosmic ...

Astronomers find evidence of a possible ninth planet beyond Neptune, reigniting the debate about the formation of the Solar ...

Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a highly ...

"For the first time in over 150 years, there is solid evidence that the solar system's planetary census is incomplete." No observational evidence for Planet Nine has been found, although this is ...

Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar ...

For years, the existence of a missing Planet 9 has been one of the predominate theories attempting to explain some of the eccentric orbits found in the outer Solar System. But so far, no such ...

A new planet like Star Wars' Tatooine detected outside of our solar system may orbit two failed ... an astrophysicist with Aarhus University who had no role in the new study.

The authors do not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and have disclosed no ... planets in the Solar System.

If you were born in the last century you might have memorized that there were nine planets in our solar system, as heard in ... The answer for many of us is no. That's exactly his point.