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Post by the light works on Sept 13, 2015 14:24:07 GMT
the concept of solar wind moving gases about is much more entertaining when you think of it in the Queen's english.
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Post by mrfatso on Sept 13, 2015 14:49:56 GMT
The Maths and lab experiments have been done by planetary scientists and physicists, a magnetic filed produced by the motion a hot liquid core will produce the same effect as it has on Earth and prevent the lighter gases from blowing away in the solar wind, without it an dense atmosphere will not last long. Even on the Earth gases such as Hydrogen and Helium are lost to space to some degree, blown by the solar wind but it is just at a rate that is slow enough for out gassing from the rocks to replenish them. Mars core became solid faster than the Earths as it is a smaller rocky planet, the core contains fewer of the radionuclides that keep our core hot enough to be liquid. It is not about the core being heavy it is more about it having a liquid state. At one point The core of Mars was liquid and did produce a magnetic field that is why we see evidence of ancient flowing water on the surface, it had a dense enough atmosphere and surface water. The Earths core could theoretically become solid in the same way at some stage, I do not know though if that will actually happen before the Sun enters its Red Giant phase and consumes it. Most oF the Earths heat is due to the heat of formation and radionuclides, with some caused by Tidal forces from the Moon etc. Yes, our molten iron core is a remnant from Earth's formation, just as Mars' formerly molten core was. The way I understand it, our core is kept molten by a combination of the rotation of Earth itself and the tidal forces of both the Moon's orbit around it and its own eliptical orbit around the Sun. Mars, Venus and Jupiter even exert a little bit of a pull on Earth at times, keeping the core moving and providing the frictional heat to keep it molten and viscous, which produces our magnetic field. I am afraid that you are slightly mistaken there although the initial heat came due to its formation it would have cooled down by now, Google Lord Kelvins famous calculations. Geophysicists consider the major portion of heat generated by the Earths core to be as a result of the decay of radioactive isotopes such as those of Uranium, Potassium, and Thorium. These are concentrated in much higher levels than in the crust, as these heavy elements sank towards the centre of Earths gravity when it was forming to put it simply. Tidal Forces and Rotational ones may have some effect, they do have major effects on some of the Jovian and Saturiian moons, but are not believed to be major players in our own heating. phys.org/news/2006-03-probing-earth-core.html |
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Post by OziRiS on Sept 13, 2015 20:00:26 GMT
Yes, our molten iron core is a remnant from Earth's formation, just as Mars' formerly molten core was. The way I understand it, our core is kept molten by a combination of the rotation of Earth itself and the tidal forces of both the Moon's orbit around it and its own eliptical orbit around the Sun. Mars, Venus and Jupiter even exert a little bit of a pull on Earth at times, keeping the core moving and providing the frictional heat to keep it molten and viscous, which produces our magnetic field. I am afraid that you are slightly mistaken there although the initial heat came due to its formation it would have cooled down by now, Google Lord Kelvins famous calculations. Geophysicists consider the major portion of heat generated by the Earths core to be as a result of the decay of radioactive isotopes such as those of Uranium, Potassium, and Thorium. These are concentrated in much higher levels than in the crust, as these heavy elements sank towards the centre of Earths gravity when it was forming to put it simply. Tidal Forces and Rotational ones may have some effect, they do have major effects on some of the Jovian and Saturiian moons, but are not believed to be major players in our own heating. phys.org/news/2006-03-probing-earth-core.htmlI'd totally forgotten about the radioactive decay as a significant contributor, but I have heard of it before. However, there are either somewhat conflicting theories that differ on their evaluations of the effects of gravitational forces on the Earth's core, or I've been grossly misinformed, because I've never heard of radioactive decay being the primary heater. Then again, my knowledge may just be outdated. As new discoveries are made, theories are weeded out until we're left with the one that has the most evidence backing it. That's the nature of science. The formation of the Moon, for example, was a topic of great debate with many different theories until the astronauts from the Apollo missions came back with Moon rocks that showed almost the same makeup as rocks on Earth, heavily tipping the scales in favor of the collission theory. Either way, thanks for the link and the explanation. There's always room to learn something new  |
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Post by the light works on Sept 13, 2015 21:03:02 GMT
some people don't seem to have any room...
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Post by OziRiS on Sept 13, 2015 21:12:33 GMT
some people don't seem to have any room... Good thing we don't have any of them around here |
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Post by the light works on Sept 13, 2015 23:37:11 GMT
some people don't seem to have any room... Good thing we don't have any of them around here true story. |
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Post by silverdragon on Sept 14, 2015 6:39:19 GMT
Room to learn something new... hey Cyber, just out of curiosity, how much space do we have on the server anyway?...
Cyber?...
Can someone rattle his chain a mo?...
Is he asleep again?...
Do we give him too much work to do?...
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Post by WhutScreenName on Sept 28, 2015 17:18:37 GMT
So there is apparently "Salty Liquid Water" flowing on Mars. That could be a boost to helping us colonize it. EDIT: I wasn't going to post an article since there are multiple, but in case someone doesn't wish to search (or your results come back differently) here's one. |
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Post by WhutScreenName on Jun 29, 2016 14:15:05 GMT
And even more news on the Mars front... it seems our ESM cloaking devices are not functioning fully as the rest of the pesky humans are finding some traces of the terraforming we previously did...
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Post by ponytail61 on Nov 30, 2016 23:20:42 GMT
Looks like there is another issue with long term space travel. A decline in vision has been noted in long term micro gravity exposure. According to this article it affects nearly 2/3rds. Basically the back of the eye flattens from pressure of the intracranial fluid around our brains. news.nationalgeographic.com/2016/11/nasa-astronauts-eyeballs-flattened-blurry-vision-space-science/"People initially didn't know what to make of it, and by 2010 there was growing concern, as it became apparent that some of the astronauts had severe structural changes that were not fully reversible upon return to Earth,” |
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Post by GTCGreg on Nov 30, 2016 23:41:18 GMT
Looks like there is another issue with long term space travel. A decline in vision has been noted in long term micro gravity exposure. According to this article it affects nearly 2/3rds. Basically the back of the eye flattens from pressure of the intracranial fluid around our brains. news.nationalgeographic.com/2016/11/nasa-astronauts-eyeballs-flattened-blurry-vision-space-science/"People initially didn't know what to make of it, and by 2010 there was growing concern, as it became apparent that some of the astronauts had severe structural changes that were not fully reversible upon return to Earth,” I'm actually surprised that the human body operates as well as it does in zero-G. |
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Post by the light works on Dec 1, 2016 2:04:49 GMT
Looks like there is another issue with long term space travel. A decline in vision has been noted in long term micro gravity exposure. According to this article it affects nearly 2/3rds. Basically the back of the eye flattens from pressure of the intracranial fluid around our brains. news.nationalgeographic.com/2016/11/nasa-astronauts-eyeballs-flattened-blurry-vision-space-science/"People initially didn't know what to make of it, and by 2010 there was growing concern, as it became apparent that some of the astronauts had severe structural changes that were not fully reversible upon return to Earth,” I'm actually surprised that the human body operates as well as it does in zero-G. we're engineered to operate inverted. at least for a period of time. we can also adapt to other environments. of course, hat adaptability may cause some of the long term issues. |
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Post by silverdragon on Dec 2, 2016 9:44:11 GMT
I can adapt my own hat to several different sizes, and even shapes, I just dont see how that may help in zero-g?...  |
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Post by the light works on Dec 2, 2016 15:28:14 GMT
I can adapt my own hat to several different sizes, and even shapes, I just dont see how that may help in zero-g?... in zero G, unless your hat is properly adapted to your head, it is likely to fall off no matter how you sit. |
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Post by WhutScreenName on Feb 22, 2017 20:20:21 GMT
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Post by the light works on Feb 23, 2017 2:04:56 GMT
seems like feasibility is sort of an "are we there, yet? question. some form of construction using materials available on site will probably be necessary, and if an automated building process can be initiated, that does let us get structures in place before we start sending people. but is our automation up to the task, yet? the other question is atmosphere for our habitat. I'm not up to date on the details of how much we can find there, and how much we have to carry with us. |
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Post by WhutScreenName on Mar 2, 2017 17:37:52 GMT
I find this to be absolutely AWESOME! Hope you do too
NASA's Curiosity rover snapped images of dust devils, small Tornados, on the surface of the red planet. The images paint a strange, eerie atmosphere.
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