Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

The search for life beyond Earth is a holy grail quest for many experts, but finding where to look is a core issue.

Earth has a newly-discovered neighbor in the solar system. But the heavenly body – possibly a dwarf planet à la Pluto – isn't a frequent visitor. Located beyond Neptune, its extreme orbit ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.

Researchers found the object named 2017 OF201 while searching for "Planet Nine" - a hypothetical planet thought to exist ...

So many unexplored secrets still lie at the outskirts of our solar system, where a potential candidate for a new dwarf planet lies. Although space beyond Neptune was thought to be mostly devoid of ...

Yet one of its most interesting oddities is the dwarf planet, Haumea ... [Related: What’s hiding in the outer solar system?] Their model was also able to make predictions about the amount ...

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 ...

There may be another world lurking between the orbital lines of our solar system. Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s ...

He says that instead of limiting planets to only eight in the solar system, we could include all of the dwarf planets and even moons. He says he often gets the question, “How will children ...

you’ll find it necessary to include a lot of other dwarf planets. Without a firm lower limit on size or mass, we’re forced to say the solar system has hundreds of planets—maybe thousands.