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Actually, 18% CO2 would make the planet that hot, it'd be on its way to ending up like Venus. The surface temp would be close to the boiling point of water. The atmosphere would be like a dense, hot, foggy soup. No amount of adaptation would allow you to live there.
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Indeed, to my knowledge the much lower solar luminosity in the Hadean/Archaean eons (70% of modern levels at 4.4 GA, rising to 80-85% at 2.5 GA) was more than counteracted by the very high CO2 and CH4 levels at the time, resulting in average temps in excess of 50 degrees C. So if Polyphemus is sufficiently distant from Alpha Cen A, the average surface temps should be quite comparable to Earth's, if somewhat higher. |
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In the movie the humans where always wearing masks or holding their breath. I couldn't help but wonder, it's not just our breath that takes in oxygen, but our entire body. A lesson hard learned during one of the James Bond movies when a women died after being coated with enough paint that her body couldn't breath.
I would imagine just wearing a mask and having the rest of your body exposed to that environment for prolonged lengths of time would make you extremely sick. |
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The effect of eclipsing caused by Polyphemus wouldn't counteract any warming effects generated by the CO2 enough to make a large difference. There is just too much CO2 in the atmosphere to counteract....that much CO2 would be the perfect blanket, it would trap L-IR that well. Not only that, Pandora would orbit the giant in fairly short time...probably a few days at the most, so for most of that time it would be out of the shadow of the giant planet. To be effective, it would have to linger in the shadow of the giant for quite some time (a week or more), and to be at the right distance to do that, the gravitational pull of the outer giant planet would probably disturb Pandora's orbit sufficiently enough to fling it out of the system. In effect, there's too much CO2 in the given atmosphere of Pandora. Now, if JC had've said about 8000-10000ppm (not the 180000ppm quoted), that would be more like it. Even 20000ppm would be reasonable. We certainly couldn't breathe in an atmosphere like that, and it would keep the planet warm...4-10degrees warmer on average than we have at present...think Cambrian Period in Earth's history (CO2 = 7000ppm), the only difference being higher oxygen levels.
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"Patriotism is the last refuge of the scoundrel", Samuel Johnson (1775). "My own suspicion is that the universe is not only queerer than we suppose, but queerer than we can suppose.", J.B.S. Haldane (1927) |
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From what I recall from the movie, Polyphemus takes up about 30 degrees in the sky, and hence (assuming that Alpha's apparent movement takes it directly behind the center of Polyphemus as viewed from Pandora) reduces Pandora's total globally-averaged insolation by 1/12th (plus whatever Polyphemus contributes in IR and reflected visible light).
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Carbon dioxide in that concentration would cause you to pass out very quickly, then eventually die of poisoning from it. The hydrogen sulphide would also cause rapid poisoning.
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The moon would never get as close as the top of the planet's atmosphere... that would be well within the Roche Distance of the planet-moon system and Pandora could be pulled to shreds (if it orbited permanently that close). Actually, given Pandora's size, it would most likely plunge into the giant intact and the resulting collision (as it would penetrate right to the core of Polyphemus...given its size) would give the giant planet a lot of grief. It would seriously disrupt the giant. For Pandora to cool significantly in the shadow of Polyphemus, it would have to linger in that shadow for a week or more. I could work out how far away it would have to be, exactly, but I don't feel like doing it right now
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"Patriotism is the last refuge of the scoundrel", Samuel Johnson (1775). "My own suspicion is that the universe is not only queerer than we suppose, but queerer than we can suppose.", J.B.S. Haldane (1927) |
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Like I said before...18% CO2 is ridiculously high. JC might not have thought this one through well enough. I'd be happier at 8000-10000ppm, but I'd want no loss of O2 levels either...maybe even an increase, to counter the CO2.
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"Patriotism is the last refuge of the scoundrel", Samuel Johnson (1775). "My own suspicion is that the universe is not only queerer than we suppose, but queerer than we can suppose.", J.B.S. Haldane (1927) |
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Actually, I think that information about 1,000 ppm leading to immediate collapse must refer to H2S, not CO2. I know that people can work in greenhouses with CO2 concentrations up to 3,000 ppm (0.3%) for 8 hours at a time with no reported side effects. The U.S. Occupational Safety and Health Administration says that average exposure for healthy adults during an eight-hour work day should not exceed 5,000 ppm (0.5%) -- so I infer that 5,000 ppm is okay as well, for at least that length of time.
I see that further down that Wikipedia article we have this: Quote:
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The Mo'na Li'sa by Avatizer Last edited by Mongo; 02-12-2010 at 12:17 AM. |
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Oops...misread the quote Those conc's were for H2S
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"Patriotism is the last refuge of the scoundrel", Samuel Johnson (1775). "My own suspicion is that the universe is not only queerer than we suppose, but queerer than we can suppose.", J.B.S. Haldane (1927) |
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What's worse is there is a small amount of HCN in the atmosphere...that'd kill you stone dead almost immediately if the conc was greater than 3500ppm. 300ppm will kill you within 10 minutes. I would hope it's somewhere in the parts per billion level. You'd smell it though...the atmosphere would smell of almonds.
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"Patriotism is the last refuge of the scoundrel", Samuel Johnson (1775). "My own suspicion is that the universe is not only queerer than we suppose, but queerer than we can suppose.", J.B.S. Haldane (1927) |
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