Research led by NASA suggests a habitable past on Mars based on the discovery of minerals in Martian rocks associated with life on Earth.

Scientists have discovered that Mars has an interior structure similar to Earth's. Results from NASA's InSight mission suggest that the red planet has a solid inner core surrounded by a liquid outer core,

A biosignature is any characteristic, element, molecule, substance or feature that serves as evidence for past or present life. It must be something that cannot be produced without life. Some examples include fossils, organic molecules derived from a biological process, or mineral patterns that form only through microbial activity.