Artist’s concept of what Planet 9 might look like, if it exists. Image via R. Hurt (IPAC)/Caltech. Help EarthSky keep going! Please donate what you can to our annual crowd-funding campaign. Does a ...

For years, the existence of a missing Planet 9 has been one of the predominate theories attempting to explain some of the eccentric orbits found in the outer Solar System. But so far, no such planet ...

The Biggest Planet In The Universe Is TerrifyingSome planets are so bizarre that they sound like science fiction, yet astronomers believe they are very real. In a journey across the universe's most ...

For decades, Saturn has been playing a strange trick on scientists. Depending on how they measure it, the giant planet seemed to rotate at different speeds, which should never be the case for a solid ...

The hunt for potentially habitable rocky planets in our galaxy has been the holy grail of exoplanet studies for decades. While the discovery of more than 5,900 exoplanets in more than 4,400 planetary ...