Despite the apparent intersection of their orbits in two dimensions, Neptune and Pluto's 3:2 orbital resonance prevents them from ever occupying the same three-dimensional space simultaneously.

The discovery of a Neptune-mass exoplanet orbiting the very low-mass M dwarf star LHS 3154 challenges theoretical models of planet formation, according to a new study. The planet, which has a mass at ...

"The complexity of the exo-Neptunian landscape provides offers a unique window onto the processes involved in the formation and evolution of planetary systems." When you purchase through links on our ...

A team of astronomers has confirmed the existence of a young planet, only 11 million years old, that orbits very close to its star (at 0.05 AU), with an orbital period of 5.4 days. Approximately 5 ...