Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously ...

An artist's concept shows what K2-18b might look like. Thought to be covered entirely in liquid water with a hydrogen-rich atmosphere, the exoplanet may be a good place to look for biological activity ...

Just because Pluto was ruled out as a planet in 2006 doesn’t mean our solar system only has eight planets. The search for Planet Nine is far from over as scientists continue to uncover clues ...

For the first time since Pluto was demoted, the idea of a true ninth planet is edging from speculation toward something ...

A team of astronomers have detected what they call the most promising signs to date of a possible biosignature, or signs of past or present life linked to biological activity, on an exoplanet named K2 ...

Star Wars fans will be well aware of Tatooine, the desolate, distant world inhabited by human settlers. In the films Tatooine ...

Astronomers have observed the intense heating of a distant planet as it swung close to its parent star, providing important clues to the atmospheric properties of the planet. The observations enabled ...

(CNN) — A tiny sign revealed in April seemed like it might change the universe as we know it. Astronomers had detected just a hint, a glimmer of two molecules swirling in the atmosphere of a distant ...