Liquid water was abundant on Mars before ~3 billion years ago (left) but vanished as the planet transitioned into the cold, dry environment we see today (right). Art ...

The curious minds at What If explore what it would mean for life on Earth if every planet in our solar system were habitable.

We tend to think of habitability in terms of individual planets and their potential to host life. But barring outliers like ...

Upon further investigation, it seems that Gliese 581d may be the only one of the two actually in the habitable zone, and its ...

NASA's Curiosity rover has found iron-rich carbonates on Mars, offering new clues about the planet's ancient climate and ...

“It’s the first time humanity has seen potential biosignatures on a habitable planet.” The study was published Wednesday in the Astrophysical Journal Letters. Other researchers called it an ...

U.S. team of researchers detected signs of two chemicals in the planet's atmosphere long considered to be "biosignatures" ...

A team of astronomers claims to have sniffed out a “biosignature” in the atmosphere of a distant planet called K2-18b. But not everyone agrees that it signals life. An illustration shows what ...