What is the primary gas composition of the thin atmosphere on Mars?

Answer

Carbon dioxide

The Martian atmosphere is composed primarily of carbon dioxide. In addition to being thin and lacking the pressure needed to keep bodily fluids liquid, this chemical composition provides virtually no protection against solar and cosmic radiation. This necessitates the use of a specialized, pressurized suit for any extravehicular activity to protect the human body from the harsh environmental conditions.

What is the primary gas composition of the thin atmosphere on Mars?

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