Most planet-forming disks have warps that can lead to planets on inclined orbits, which could explain where the tilt of Earth ...

Beyond the familiar planets lies a fascinating frontier filled with icy worlds, mysterious orbits, and cosmic curiosities.

Astronomers propose a new hypothetical planet, Planet Y, beyond Neptune, based on observed orbital anomalies in the Kuiper ...

Most of us grew up learning that there are nine planets in our solar system. Back in 2006 that all changed, when Pluto was demoted… ...

Venus and Jupiter, the brightest planets in our solar system, are about to make their closest approach during their August ...

Is there life on planets other than Earth? For generations, scientists have puzzled over the question, searching for planets that might have the right conditions both inside and outside the Milky ...

EarthSky.com explains how seven planets in our solar system will be visible in the night sky this week.