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

Haumea is one of the fastest rotating large objects in our solar system. A single day on the dwarf planet is only about 4 Earth hours long.

Take, for example, the dwarf planet Haumea, a large egg-shaped body that hangs out beyond Neptune in the far reaches of our little planetary neighborhood, which researchers just discovered also ...

Among the many mysteries that make the furthest reaches of our solar system, well, mysterious, is the exceptionally egg-shaped path of a dwarf planet called 90377 Sedna. Its 11,400-year orbit ...

Related: Tiny 14-inch satellite studies 'hot Jupiter' exoplanets evaporating into space In general, the doomed planet WASP-12b orbits its yellow dwarf star so closely that it almost fits an entire ...

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.

Now, a U.S.-based trio hunting the elusive world has instead stumbled on what appears to be a new dwarf planet in the solar system's outer reaches. And the existence of the new kid on the block ...

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 ...