The main gas found in the atmosphere of Mars is carbon dioxide (CO₂), comprising about 95% of the Martian atmosphere. The thin atmosphere on Mars is primarily composed of carbon dioxide, with trace amounts of nitrogen, argon, and oxygen. The prevalence of carbon dioxide contributes to the planet's cold and dry environment, with average temperatures around -80 degrees Fahrenheit (-62 degrees Celsius). The thin Martian atmosphere hinders the greenhouse effect, which is why Mars is colder than Earth despite being in the same solar system. Scientists study Mars' atmosphere to understand its climate and potential for past life.