What we know about the search for ‘Planet Nine’ in our solar system - The idea of a massive undiscovered planet has been around since before the discovery of Pluto in the 1930s ...

Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the discovery of Pluto in the 1930s. Labeled as planet X, prominent astronomers ...

A tiny object far beyond Pluto, newly discovered by the Subaru Telescope, could reshape our understanding of the early Solar System. Named 2023 KQ14, this rare “sednoid” follows an unusual orbit that ...

Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

Space Could we tweak the solar system to make Pluto a planet again? Pluto officially lost its planethood in 2006, and this episode of Dead Planets Society is all about bringing it back by making ...

There's more to the solar system beyond Pluto's orbit. Researchers have discovered a new dwarf planet nearly 7.5 billion miles away from the sun. Even more intriguing, the discovery suggests the ...

As Pluto is finally added to the University of Arizona's scale model solar system, a new study suggests how the dwarf planet's cold heart was originally broken.