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#11
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Vincent Walker wrote:
lal_truckee wrote: Vincent Walker wrote: The theory is that the reversing of polarity was the reason that Mars eventually lost its atmosphere. What theory is that, pray tell? I saw this on Nova on PBS. Basically besides gravity the atmosphere is believed to be held in place by magnetic forces. As the molten cores of the terran planets cool over time their magnetic fields reverse and weaken. Mars, by the combination of its smaller size and position in the solar system - theoretically of course - eventually lost its ability to hold an atmosphere in place. You do know you either hoaxed yourself or they hoaxed you? (I won't comment on which I think happened.) The Earth's mag field has reversed numerous times; it has nothing to do with the atmosphere. Cooling cores are not the driver, either. The last reversal was about 780,000 years ago. |
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#12
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klaus wrote:
The Real Bev wrote: VtSkier wrote: The Real Bev wrote: Vincent Walker wrote: The Real Bev wrote: Isn't there a reason it's called Greenland rather than Whiteland? Scientists are now saying that the Earth is reversing it's polarity. All compasses will wind up pointing south. Imagine what that'll do. The theory is that the reversing of polarity was the reason that Mars eventually lost its atmosphere. Oh well............. Forget that crap, where can I get a reversable compass? Actually it won't matter, as long as you know your compass will point south instead of north. It'll be like learning the metric system by throwing away your imperial measuring devices and buying metric devices. No it won't! Just don't fly that day. No problem. OK, smartass, will east and west switch too? Does it rotate or flip? Nature never flips. Besides, it's already a crap shoot. It's called magnetic declination. OK, Mr. Scientist, will magnetic south be exactly where magnetic north is now, or will it be in a slightly different place, or maybe even on the actual rotational pole? One more thing that English majors don't know... -- Cheers, Bev ================================================== ======== There is a fine line between 'hobby' and 'mental illness.' |
#13
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Vincent Walker wrote:
The Real Bev wrote: OK, smartass, will east and west switch too? Does it rotate or flip? One thing's for sure, you're going to need your SPF 150. The question that I have isn't the increased radiation going to heat the atmosphere and if we are in the middle of this process - maybe just maybe this is the primary reason for Global Warming. If you recall all the debate about the Ozone layer, maybe the loss is related to the magnetic field reversal. I'm not saying that CO2 isn't a contributing factor but maybe the major reasons for Warming are well beyond our control. That would be a real kick in the ass. Especially for the Sierra Club. -- Cheers, Bev ================================================== ======== There is a fine line between 'hobby' and 'mental illness.' |
#14
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The Real Bev wrote:
VtSkier wrote: The Real Bev wrote: Vincent Walker wrote: The Real Bev wrote: Isn't there a reason it's called Greenland rather than Whiteland? Scientists are now saying that the Earth is reversing it's polarity. All compasses will wind up pointing south. Imagine what that'll do. The theory is that the reversing of polarity was the reason that Mars eventually lost its atmosphere. Oh well............. Forget that crap, where can I get a reversable compass? Actually it won't matter, as long as you know your compass will point south instead of north. It'll be like learning the metric system by throwing away your imperial measuring devices and buying metric devices. No it won't! OK, smartass, will east and west switch too? Does it rotate or flip? It'll be whatever the Bureau of Standards decides it is. It's all arbitrary anyway. Now how's that for a (non) answer? |
#15
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Vincent Walker wrote:
lal_truckee wrote: Vincent Walker wrote: The theory is that the reversing of polarity was the reason that Mars eventually lost its atmosphere. What theory is that, pray tell? I saw this on Nova on PBS. Basically besides gravity the atmosphere is believed to be held in place by magnetic forces. As the molten cores of the terran planets cool over time their magnetic fields reverse and weaken. Mars, by the combination of its smaller size and position in the solar system - theoretically of course - eventually lost its ability to hold an atmosphere in place. Hmmm. It's my belief that Mars has an atmosphere. It's not as dense as Earth's, and it's high in CO2, but it's there. Could you 'splain to me how magnetism can possibly hold an atmosphere in place? |
#16
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Vincent Walker wrote:
VtSkier wrote: Could you 'splain to me how magnetism can possibly hold an atmosphere in place? Combination of magnetism and gravity was how it was explained to me. There are enough gaseous ions with + and - charges in the atmosphere to be affected by magnetism. I know water (therefore water vapor) is polar in nature and I am fairly certain Ozone is as well (also being inherently unstable). Yes Mars does have an atmosphere but one school of thought suggests that the recent evidence of running water on the planet indicates that at some point in its past the atmosphere was much denser. As the planet cooled and it's field weakened, the atmosphere significantly thinned out. Correct me if I'm wrong but they have found evidence that water existed on Mars yet they haven't actually found any. Nobody is saying that this is fact - it's a theory. It's interesting to talk about but I'm certainly not offering it as empirical fact. We could talk about whether or not Jupiter is actually an unignited star. Who knows. Ions tend to react with static electricity charges, but I have never heard of them reacting very much to magnetism. Or rather, I haven't heard of planetary magnetism being strong enough to react with atmospheric ions. Cosmic rays are quit another thing. They are so highly charged that any polarity can deflect or attract them. Having or not having liquid water is not the same as having or not having an atmosphere. There is certainly evidence of erosion on Mars. The cause of this erosion is still very much up in the air. We have wind driven erosion here on Earth. The Loess beds of Europe and North America are strong evidence for it. What we have is the softening effect of water erosion. We can't detect what the surface effects of wind erosion are here on earth except for areas that have soft materials to blow around and are blown around all the time, like deserts and beaches. Consider Mons Olympus. It is a dead volcano. It is very, very old. It has signs of erosion all over it. If it were here on earth, it wouldn't be much bigger than Mount Ascutney, another dead volcano, here in Vermont. If there was liquid water on Mars at some time in the past, which is quite a different quest than finding an atmosphere, it was so long ago that it didn't have time to reduce Mons Olympus to the size it should be if water were there to do the work. As for Jupiter, it has long been thought to be Sol's alter ego as part of a binary system. Its lunar "children" are nearly planets themselves, and the the only other liquid water in the Solar System may well be found on one of those moons. Nobody knows if Jupiter is unignited or if its "flame" went out. It does give off huge amounts of energy, which is why there may be liquid water on one of its moons. |
#17
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Vincent Walker wrote: The Real Bev wrote: Isn't there a reason it's called Greenland rather than Whiteland? Scientists are now saying that the Earth is reversing it's polarity. All compasses will wind up pointing south. Imagine what that'll do. The theory is that the reversing of polarity was the reason that Mars eventually lost its atmosphere. Oh well............. I heard about this reversing-polarity thing, and I want more details on this. Will Ellesmere Island (now the center of magnetic north) become the center of magnetic south instead? |
#18
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The Real Bev wrote: VtSkier wrote: The Real Bev wrote: Vincent Walker wrote: The Real Bev wrote: Isn't there a reason it's called Greenland rather than Whiteland? Scientists are now saying that the Earth is reversing it's polarity. All compasses will wind up pointing south. Imagine what that'll do. The theory is that the reversing of polarity was the reason that Mars eventually lost its atmosphere. Oh well............. Forget that crap, where can I get a reversable compass? Actually it won't matter, as long as you know your compass will point south instead of north. It'll be like learning the metric system by throwing away your imperial measuring devices and buying metric devices. No it won't! OK, smartass, will east and west switch too? Does it rotate or flip? Well, your existing compass can't flip, because it's made the way it is. If I understand right, while the north end of the needle now points to Ellesmere Island, now the south end will. But you know what? It ain't no big deal. Right now, you line up the north-marked end of the needle with north on the dial; if it reverses, you just line up the south-marked end of the needle with north on the dial, and bingo, you're pointed at Ellesmere Island the way you used to be. East is still east and west is still west and never the two shall meet. |
#19
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In article ,
The Real Bev writes: OK, smartass, will east and west switch too? Does it rotate or flip? It doesn't matter because at the point where the polarity switches the earth is going to spin backward. So the sun will still rise on the east... bruno. |
#20
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The Real Bev wrote:
OK, Mr. Scientist, will magnetic south be exactly where magnetic north is now, or will it be in a slightly different place, or maybe even on the actual rotational pole? Highly doubtful it would be even close to anything mirrow image of now. Same for rotational pole. -klaus |
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