05-17-2014, 02:23 PM | #41 | |
Untagged
Join Date: Oct 2004
Location: Forest Grove, Beaverton, Oregon
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Re: [Space] Panspermia and the Campgaign
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Beware, poor communication skills. No offense intended. If offended, it just means that I failed my writing skill check. |
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05-17-2014, 02:30 PM | #42 | |
Join Date: May 2013
Location: Ellicott City, MD
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Re: [Space] Panspermia and the Campgaign
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05-17-2014, 02:45 PM | #43 | |
Untagged
Join Date: Oct 2004
Location: Forest Grove, Beaverton, Oregon
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Re: [Space] Panspermia and the Campgaign
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Not to mention expert botanists getting a few seeds to germinate isn't even close them surviving on their own after crashing on an alien planet. The only things I can imagine having any chance of surviving such a scenario are very hardy encased in stone archaea. But they are so distantly related to us as to almost require their multi-billion year descendants be as alien as unrelated aliens with similar biochemistry.
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Beware, poor communication skills. No offense intended. If offended, it just means that I failed my writing skill check. |
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05-17-2014, 02:47 PM | #44 | |
Join Date: May 2013
Location: Ellicott City, MD
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Re: [Space] Panspermia and the Campgaign
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05-17-2014, 03:13 PM | #45 | |
Join Date: Mar 2013
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Re: [Space] Panspermia and the Campgaign
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And the meteorite I mentioned from Earth to Mars and back again was on the news several years back |
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05-17-2014, 03:17 PM | #46 | |
Computer Scientist
Join Date: Aug 2004
Location: Dallas, Texas
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Re: [Space] Panspermia and the Campgaign
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05-17-2014, 09:57 PM | #47 | ||
Join Date: Nov 2004
Location: The plutonium rich regions of Washington State
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Re: [Space] Panspermia and the Campgaign
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* The increased insolation of Venus results in two effects - (1) more water evaporates so there is more water in the atmosphere, and (2) the water can rise higher in the atmosphere before it condenses and rains out. * Water is a strong greenhouse gas, so the thicker blanket of water results in even higher temperatures, which leads to more water and thicker blankes of water due to its higher altitude, leading to even more water in the air and even higher altitudes before condensation. * The water rises high enough in the atmosphere that significant ultraviolet light can get through and hit the water. The water is photodissociated into hydrogen atoms and hydroxyl radicals. The hydrogen escapes into space (Jeans escape), and over time the water starts to dissapear leaving an atmosphere enriched in oxygen behind. * While this is happening, surface temperatures get high enough to bake carbon dioxide out of lime deposits. Now the carbon dioxide acts as a greenhouse gas as well, accelerating the process. * Oxygen reacts with minerals in the venerian crust, and is removed from the air. * Water is a major lubricant for plate tectonics here on Earth. As water is removed from the air, it gets harder for the plates to move around and eventually the tectonic cycle grinds to a halt. * The water is eventually fully photolyzed and drifts away. This leaves a world with a thick atmosphere of carbon dioxide and no plate tectonics. Luke |
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05-17-2014, 10:17 PM | #48 | |
Join Date: Aug 2004
Location: traveller
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Re: [Space] Panspermia and the Campgaign
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So far as I know, tektites are the only Earth rocks known to have been in space. They were only suborbital, however. |
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05-17-2014, 10:33 PM | #49 | |
Join Date: Jun 2005
Location: Lawrence, KS
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Re: [Space] Panspermia and the Campgaign
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Bill Stoddard |
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05-17-2014, 10:36 PM | #50 | |
Join Date: Jun 2005
Location: Lawrence, KS
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Re: [Space] Panspermia and the Campgaign
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Bill Stoddard |
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Tags |
evolution, space, system generation |
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