A new classification scheme may help us better understand planet formation — including the history of our own family of worlds.

The two exoplanets, or planets outside of our solar system, orbit a star called TOI-1453, which is slightly cooler and ...

The solar system has many more moons than the one we ... often referred to as the "three-body problem." The two innermost planets, Venus and Mercury, will shine together low in the western sky ...

The number of planetary moons may also increase if we find more planets in the solar system. One such world is the elusive Planet Nine — a hypothetical giant planet that may lurk in the far ...