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

A polarizing Harvard astronomer known for splashy theories about alien visits has been tapped by the White House to lead a ...

Scientists say moons around rogue planets wandering through the galaxy could remain warm enough for life thanks to tidal heating and hydrogen-rich atmospheres. These dark, starless worlds may have had ...

Along with other recent discoveries, the new finding from Perseverance boosts the case that Mars once hosted conditions that ...

The “Wow!” signal is one of our best pieces of evidence for aliens, but researchers are building a compelling case for a more ...