Over the past three decades, computer models of planetary system formation have gone from fairly crude representations to ...

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 ...

Learn how a possible ninth planet, the theoretical Planet X, could have acquired its wide orbit in the outer Solar System — a process that’s also applicable for other planets. There could be a ninth ...

NASA’s Double Asteroid Redirection Test, known as DART, did more than shove a small asteroid into a tighter loop around its companion. The September 2022 impact also measurably changed the binary ...