The Early Solar System Could Have Hosted a Fifth Giant Planet, According to New Study

Artist’s impression of a rogue gas giant planet, free-floating in interstellar space. According to a new study, the early Solar System hosted a fifth gas giant planet besides Jupiter, Saturn, Uranus, and Neptune, which was eventually ejected into interstellar space through the gravitational interactions with the rest of the Solar System’s giant planets. […]

New Petition Aims to Restore Pluto's Planetary Status

A breathtaking montage of Pluto and Charon, assembled from separate images that were taken on July 13 and 14 from NASA’s New Horizons spacecraft, as the latter was making its historic close fly by of the distant dwarf planet and its system of moons. New Horizons’ highly successful mission has provided a new […]

The Continuing Saga of Planet X: Could More Massive Planets Hide Beyond Pluto?

An artist’s impression of Eris, the most massive dwarf planet known to date, with an aphelion of 97 AU from the Sun. Could bigger Super-Earth-type planets be orbiting even farther out? Image Credit: ESO/L. Calçada and Nick Risinger

 

Just like the proverbial cat with nine lives, the notion of an unseen planet […]