Date: Wed Nov 28 16:55:01 2007

Author: Jerry DiMarco

Subject: Re: Talked to a crazy one today....

Post:
Actually there was an interesting Nova program on the upcoming pole
reversal a few months ago. On that program they interviewed one geologist
who studied a pole reversal as recorded in layers of volcanic rock on
Steen's mountain in Oregon. Those rocks recorded the reversal in great
detail. So we know about previous pole reversals in greater detail
now. Additionally, computer models have advanced to the point where they
can actually predict the sequence of events in a typical pole
reversal. The typical scenario predicted is not sudden or final, but it
does make sense because it is similar to other complex systems we have
encountered. There is a simulation of a pole reversal in a link on this page:



I find it hard to believe that scientists would not be able to
determine what, if anything, will happen when we pass through the plane of
the galaxy. Even if we couldn't, where is the science that proves any of
those claims are plausible?

Jerry



At 11/26/2007 05:30 PM, you wrote:
>Thanks for the perspective on the various end-of-the-world-as-we-know-it
>scenarios.
>
>> We've also never actually witnessed a pole shift (some say the
>>poles will shift for the sun and every other planet, too), so we can't
>>say with absolute certainty how it happens or at what rate. Of course, we
>>CAN say that we think the likelihood of any of it happening is low...very low.
>
>The pole reversals, though not witnessed, have been studied by examining
>the field lines trapped in undersea subduction zones, as described in Wiki
>and are the foundation of plate tectonics.
>(Those geologists will be right on you if anything is off).
>If you can't say how or when it happens, how can you say the probability
>is very low? .
>http://en.wikipedia.org/wiki/Geomagnetic_reversal
>
>Not that pole reversal is a known extinction event, like a meteor or volcanos.
>It could cause problems by not shielding us from radiation, as well as
>messing up a lot of other stuff.
>but it has happened in remarkably short, human-viewable time frames.
>satellites, if still in orbit, would still GPS>
>
>also there is a 0.15% chance a Gamma Ray Burst could happen near us (in
>our galaxy), don't forget that!
>
>I think the best philosophy (or when dealing with citizens with these kind
>of concerns)
>is to make the most of the time that we DO have.
>
>steve "flippin' out" anderson


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Jerry DiMarco
Manager of Lecture Demonstrations and Instructional Labs
Montana State Univ., Physics Dept.
Bozeman, MT

Our Motto: "What would your mother do?"


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