Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...

The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper’s authors have dubbed ...

Our solar system is way more bizarre and dynamic than what our school textbooks taught us. From Venus being super hot to diamond rain on Neptune, and the Sun holding almost all the mass—here are some ...