This may explain the strange properties of the orbits of our solar system's planets, which are not quite perfectly circular, and all lie on slightly different planes. NASA artist’s conception of ...

Their current orbital properties are well understood but the planetary orbits have evolved and changed since the formation of the solar system. Planetary migrations have been the most prominent ...

A massive interstellar object passing through our solar system during its formative years likely altered the orbits of planets into trajectories observed today, a new study says. Interactions with ...