Re: [sl4] giant planets ignition - one more existential risk

From: Alexei Turchin (alexeiturchin@gmail.com)
Date: Fri Dec 12 2008 - 02:50:47 MST


On 12/12/08, Stuart Armstrong <dragondreaming@googlemail.com> wrote:
> Thanks for an informed post on the subject. It's what was missing in
> the speculations and counter-speculations.
>
>
> > To fuse, deuterium nuclei have to come together physically in an area the
> > size of the atomic nucleus. This takes a great deal of pressure and heat.
> > More likely than two deuterium nuclei fusing is that a deuterium nucleus and
> > a hydrogen nucleus will fuse to form helium 3. I doubt that the pressures in
> > a gas giant are anything like high enough to support detonation of the whole
> > planet. Unlike nuclear fission, where fast neutron cause fission ahead of
> > the shock front resulting from the release of energy by prior fission events
> > and thus generate true detonations, fusion requires extremely high pressures
> > and temperatures such as are found in the centers of stars.
>
>
> ...
>
>
> > Bill
> >
> > William P. (Bill) Hall, PhD
> > Documentation and Knowledge Management Systems Analyst
>



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