Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have ...

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 ...

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

A new dwarf planet, discovered beyond Neptune and described as Pluto's 'cousin,' could void the hypothesis of a Planet X in ...

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 ...

"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 ...

Now, there’s no scientific reason we can’t have thousands of planets in the solar system, but cultural considerations are a different issue. An overabundance of planets would seem to dilute ...

Astronomers have discovered a rare solar system with six planets moving ... and it has been very busy. It has found no less than 7,000 planet candidates; 500-plus of them are confirmed, and ...