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

All must, then, be regarded as having always been members of the solar system, however much their orbits may have changed. They are supposed to be derived from the secondary nuclei of a soiral nebula.

New simulations reveal that around 1 million "macroscopic" objects from our closest stellar neighbors, the Alpha Centauri ...

New research suggests that our Solar System may already be swimming in interstellar objects that originate from the Alpha ...

A new study implies that in the past, moons in our solar system may have had rings just like planets do — deepening the mystery of why no ringed moons exist today.