Potential alien life has been discovered on a crater on Mars - and humans and animals could be responsible, scientists say. Nasa's Perseverance rover found diverse organic matter in the Jezero crater, which experts say suggests a more complex system than previously thought may have existed in the past.
A number of different explanations for the origins of organic matter on the Red Planet include water-rock interactions and biotic origins - derived from living organisms.
Deposits by interplanetary dust or meteors are also being considered by scientists. According to the study, understanding more about Martian organic matter could shed light on the availability of carbon sources, with implications for the search for potential signs of life.
