Is there a massive undiscovered planet on the outer reaches of the solar system? The idea has been around since before the ...

Beyond Neptune, a celestial object puzzles astronomers with its synchronized motion with the giant planet. Its inclined orbit ...

Astronomers have found 2023 KQ14, nicknamed Ammonite, a rare sednoid with a unique orbit that challenges the Planet Nine ...

An icy object in perfect sync with Neptune reveals new details about planetary migration and unseen bodies far beyond the Kuiper Belt.

Discovered through the Formation of the Outer Solar System: An Icy Legacy (FOSSIL) survey using the Subaru Telescope in ...

A massive doomed exoplanet on a death spiral toward its parent star has three possible catastrophic fates. A massive planet ...

We bring you an exclusive behind-the-scenes look at this iconic mission with Dr Linda Spilker, from her first job out of ...

A lone body, making one passage around the Sun for every ten by Neptune, is rewriting the rules of planetary dynamics in the ...

Exciting new findings reveal that WASP-121b, a blazing-hot giant planet, may have formed far from its star in a colder, ice-rich region—before migrating inward to its current extreme orbit. Chemical f ...

A cheerfully macabre comedy of misunderstandings, lies and delusion, “Terrestrial” teases with the promise of science-fiction ...