The organic molecules could come from life or from ordinary chemistry — only samples returned to Earth can settle it.

NASA's Perseverance rover has uncovered one of the most intriguing clues yet in humanity's search for life beyond Earth.

A rather outlandish claim that an alien gun was spotted in a photo taken on Mars 12 years ago has drawn attention.

An unusual sighting in a NASA image has reignited speculation that something extraterrestrial once existed on Mars.

The Exploration Rover for Navigating Extreme Sloped Terrain (ERNEST) test rover has been put through its paces with great ...

NASA has announced yet another milestone for the Perseverance rover: It's officially traversed the length of a marathon on ...

A new survey of hundreds of astrobiologists reveals that, despite NASA's high-profile declarations about Mars and exoplanet K2-18b, most experts do not yet think alien life has probably been found.

NASA wants to send an ambitious fleet of helicopters to soar through Martian skies—but scientists fear the endeavor could ...

A NASA‑linked study argues that alien probes could already be in our Solar System, but our surveys are still too crude to ...