Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

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 ...

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 ...

Pluto and other large bodies in the Kuiper Belt are surprisingly rich in rock rather than ice. It may be because the early solar system consisted of much more carbon than previously thought, a new ...

The Subaru Telescope has made an exciting discovery: a small body beyond Pluto, with implications for the formation, ...