Martian soil perchlorate readings being caused by terrestrial sources, which at the time were thought could have migrated from the spacecraft either into samples or the instrumentation. However, each new lander has confirmed their presence in the soil locally and the "Mars Odyssey" orbiter confirmed they are spread globally across the entire surface of the planet. While our understanding of Martian soils is extremely rudimentary, their diversity may raise the question of how we might compare them with our Earth-based soils. Applying an Earth-based system is largely debatable but a simple option is to distinguish the (largely) biotic Earth from the abiotic
Mr. Martian Mr. Martian Mr. Martian (AKA: CH'kk Kk'xx – Chuck Cox) is a fictional character in Big Bang Comics, who first appeared in "Big Bang" #21, but didn't receive his own story until "World Class Comics" #1. CH'kk Kk'xx is a Martian originally sent to investigate planet Earth and see that the Nuclear Age went without disaster. CH'kks' spaceship crashed outside of Roswell after being shot down by the American Air Force, mistaking it for a Communist attack. CH'kk went underground as Chuck Cox, and soon came to like the Earth, and instead decided to defend it from his own planet.