The strongest hints yet that Mars once hosted living microbes are no longer theoretical models or ambiguous chemistry. They ...

A bizarre fossil called Prototaxites, which was the largest life-form on land 400 million years ago, may have been a completely unknown form of multicellular life, according to a new study.

NASA's Perseverance rover discovered rocks on Mars, providing new evidence the red planet was once a wet, habitable world ...

A mudstone sample from Jezero Crater shows textures and minerals that on Earth often form through microbial activity. Scientists caution that nonbiological processes could also explain the features, ...

Add Yahoo as a preferred source to see more of our stories on Google. A biosignature is any characteristic, element, molecule, substance or feature that serves as evidence for past or present life. It ...

Has NASA's Perseverance rover at long last found evidence that life did indeed once exist on Mars? Well, after more than four years of scouring the Red Planet's rocky surface, the intrepid rover has ...

Mars is starting to look less like a dead world and more like a planet that once had the right pockets for life to take hold. The latest focus is on enormous caverns apparently carved by flowing water ...

Ancient duplicated genes are giving scientists their first real clues about what life was like before all life on Earth shared a common ancestor.

New method also detects molecular signs of photosynthesis almost 1 billion years earlier than previously documented; Combining chemistry and AI, pioneering method could revolutionize search for ...