Out of the 6,000 known exoplanets, it's these rocky worlds that are most worthy of attention in the search for life beyond our planet.

A planet orbiting the star GJ 887 may be the closest object to Earth with good prospects for supporting life, although confirming that will not be easy. The newly discovered “super-Earth” with a mass ...

Is there a massive undiscovered planet on the outer reaches of the Solar System? The idea has been around since before the discovery of Pluto in the 1930s. Labelled as planet X, prominent astronomers ...

Add Yahoo as a preferred source to see more of our stories on Google. An illustration showing Planet Nine, a hypothetical, undiscovered planet in our solar system. New research now suggests the ...

Astronomers have detected an Earth-size planet candidate orbiting a nearby star once a year, making it a promising target for future studies.

Scientists discover a nearby planet with a molten interior and sulfur-rich atmosphere, L 98-59 d, revealing a possible new ...

Add Yahoo as a preferred source to see more of our stories on Google. Some exoplanets, like the one shown in this illustration, may have atmospheres that could make them potentially suitable for life.

Researchers in Switzerland have built an AI model to uncover potentially habitable worlds that are hiding from view. As detailed in a new study published in the journal Astronomy and & Astrophysics, ...

Astronomers have long been on the hunt for "Planet Nine," a hypothetical planet that lies within our solar system just beyond Neptune. Scientific evidence has alternately pointed to and against the ...

LONDON — 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 ...