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<blockquote data-quote="jeff37923" data-source="post: 2951488" data-attributes="member: 26008"><p>OK. Temperate-cold thin atmosphere desert sounds like the Andes Mountains on Earth. Hmmm...</p><p></p><p>You could have had the world partially terraformed by hitting it with a few comets. The air would still escape over a few hundred years, but it would be breathable in deep canyons and craters. The 20% surface water could have come from the comets, filling the bottoms of the craters and canyons, with the oxygen-producing plants near the oasis of water. </p><p></p><p>I'd have to look at a pressure-temperature chart of water, but at low pressures water boils at very low temperatures. For a world with a low-pressure atmosphere, that atmosphere could be a mixture of water-vapor and carbon dioxide. The world would still not have any free-standing water, like a desert, but a character without a filter mask would drown in the air. Oxygen could be produced by microbial floating plants, adding to the need for filter masks.</p><p></p><p>Oh, someone earlier in the thread mentioned Argon as an inert gas. Its also the same gas used in flourescant lights and IIRC, it displaces air in confined spaces. Although it would be cool to say that there is a sizeable amount in the thin atmosphere due to a nuclear war from a previous civilization.</p><p>Tell me more about what you'd like for the world so I can provide more suggestions.</p></blockquote><p></p>
[QUOTE="jeff37923, post: 2951488, member: 26008"] OK. Temperate-cold thin atmosphere desert sounds like the Andes Mountains on Earth. Hmmm... You could have had the world partially terraformed by hitting it with a few comets. The air would still escape over a few hundred years, but it would be breathable in deep canyons and craters. The 20% surface water could have come from the comets, filling the bottoms of the craters and canyons, with the oxygen-producing plants near the oasis of water. I'd have to look at a pressure-temperature chart of water, but at low pressures water boils at very low temperatures. For a world with a low-pressure atmosphere, that atmosphere could be a mixture of water-vapor and carbon dioxide. The world would still not have any free-standing water, like a desert, but a character without a filter mask would drown in the air. Oxygen could be produced by microbial floating plants, adding to the need for filter masks. Oh, someone earlier in the thread mentioned Argon as an inert gas. Its also the same gas used in flourescant lights and IIRC, it displaces air in confined spaces. Although it would be cool to say that there is a sizeable amount in the thin atmosphere due to a nuclear war from a previous civilization. Tell me more about what you'd like for the world so I can provide more suggestions. [/QUOTE]
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