Mars Atmosphere Composition

Mars' atmosphere is very thin compared to Earth's, composed mostly of carbon dioxide (about 95%), with small amounts of nitrogen and argon. It contains trace amounts of oxygen and other gases. The thinness of the atmosphere means surface pressure is very low, about 0.6% of Earth's, resulting in a cold, dry environment. This composition contributes to the planet's harsh conditions and limits the possibility of human respiration without artificial life support. Understanding Mars' atmospheric makeup helps scientists study its climate, potential for past habitability, and how best to support future missions.