Mars is known for its thin atmosphere, where CO2 dominates and provides most of the atmospheric mass and pressure. In fact, the pressure is similar to that in the Earth’s stratosphere, which is a layer of the atmosphere, at more than 30km above the surface. But what about water? Water on Mars is currently found on the surface as a layer of ice – several kilometers thick – at the north pole. It also appears as seasonal frost at the coldest times of the year, and in the atmosphere as vapor and ice. Nevertheless, the Martian atmosphere is extremely dry…
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