Mars Has So Much Radiation, Any Signs of Life Would Be Buried Six Feet Under ScienceAlertRock samples from NASA's Curiosity Mars rover contain key ingredient of life Space.comNASA's Curiosity Takes Inventory of Key Life Ingredient on Mars – NASA Mars Exploration NASA Mars ExplorationCosmic rays could erase evidence of ancient Martian life InverseNasa images reveal life may have existed on Mars for long period of time, ground-breaking study claims...