The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Jan. 15, 2025 — New observational data and simulation models have confirmed a new type of planet unlike anything found in the Solar System. This provides another piece of the puzzle to ...

Aside from the solar system once again having nine planets ... “We would need to refine the definition of a planet since an Earth-like planet located far beyond Neptune would likely belong ...

The new definition would extend to planets outside of our solar system, have a minimum mass requirement, but also have an upper limit on how big a planet can be. The new rules would limit planets ...