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

From: Alexei Turchin (alexeiturchin@gmail.com)
Date: Thu Dec 11 2008 - 16:01:58 MST

Look. There is a big difference between very slow burning of ordinary
hydrogen in the Sun and detonation of deiterium. Detonation means
explosion.
http://en.wikipedia.org/wiki/Detonation

Ordinary hydrogen could not detonate - the p-p reaction takes time.
D+D could react immediately. So, D+D could give an explosion, and
p+p - can''t.

Ammount of D (deiterium) on the Jupiter is very large. If its
concentration is only 1 to 1600, then its ammount is in order of 20
masses of the Moon. This is in order of 10**24 кг.

If all it reacts 1/100 of this mass will be transformed into energy.
It is 10**21 kg. it is aproximately 10**37 J.

But the Sun every second creates only 10**26 J (3.83×10**26 W)
http://en.wikipedia.org/wiki/Sun

That means that if reaction would take 1 second, the Jupiter will
shine 10**11 times brighter then the Sun.

This is 100 billion times!

This is upper limit, of course, and we could reduce it on several
orders of magnitude easily, because not all D will react, because
Jupiter is futher from the earth then Sun (and so earth would receive
25 times less share of its energy) and so on.

But it still huge enough to think about it.

> On Thu, 11 Dec 2008 20:03:45 +0100, Alexei Turchin <alexeiturchin@gmail.com>
> wrote:
>
>
> > If all deiterium in the Jupiter reacts it would relize energy of 30
> > 000 years of Sun work in less then 10 seconds.
> > In this case the Earth will lose its atmosphere and several kilometers
> > of upper curst.
> >
>
> Can you tell us on which (maybe more than one) sources your "knowledge" and
> estimations are based, and what exactly leads you to this beliefs?
>
> How would you explain that the fusion reaction of the Jupiter
> would be 9,4*10^10 (which is the result of your 30000 years in 10 sec)
> times stronger as a MUCH bigger system, namely the sun doing the same
> thing?The sun contains about 99% of the mass of our solar system. And it
> does allday long nothing but constantly burning in a fusion reaction.
> Besides that,the sun fuses mostly ordinary hydrogen atoms into helium, which
> providesmore energy than deuterium because of the higher binding energy in
> the nucleus.
>
> gs
>
> --
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