[Magdalen] Murdoch

[James Oppenheimer-Crawford]

Yes, but while that's correct it's not the topic.

James W. Oppenheimer-Crawford
*“A life is like a garden. Perfect moments can be had, but not preserved,
except in memory. LLAP**”  -- *Leonard Nimoy

On Fri, Sep 11, 2015 at 12:13 PM, Roger Stokes <
roger.stokes65 at btinternet.com> wrote:

> On 11/09/2015 01:30, James Oppenheimer-Crawford wrote:
>
>> The core will not lose enough velocity of churning to stop the magnetic
>> field for the time left between the present and the time when the sun
>> will envelop the earth (vaporizing it entirely).
>>
>
> That may be so but there are periodic reversals of the magnetic field.
> The last happened about 780,000 years ago and the average interval is about
> 450,000 years.  During the switch-over period the strength of the magnetic
> fireld drops to about 5% of the current strength.
>
> Roger
>