[ExI] 67p rosetta d/h

[Tomaz Kristan]

Spike!

> Tomaz, why do you think not?

Be cause I am quite confident that our water is of a terrestrial origin. We
have a lot of resulting neutrons from radioactive decays deep down. In a
minute or two after one, we may have a hydrogen atom. And an oxygen atom is
 quite willing to divorce e.g. iron and to make a commitment trio - H20,
water.

That is what I think. We shall see how stupid I am.

On Wed, Dec 10, 2014 at 5:06 PM, BillK <pharos at gmail.com> wrote:

> On Wed, Dec 10, 2014 at 5:49 AM, spike  wrote:
> <snip>
> > So, tomorrow we get a clue for where the Earth's water came from.  If 67P
> > has a D/H ratio that matches Earth, well now isn't that interesting.  If
> it
> > matches Mars, isn't that puzzling.  If it matches the Kuiper belt
> objects,
> > now what do we think?
> >
> > Any guesses before the number comes out?  I think it will match Earth
> > because I have long since bought into the argument that our water came
> from
> > comets.
> >
>
>
> They already announced preliminary results last month.
>
> <
> http://news.sciencemag.org/europe/2014/11/doomed-comet-lander-delivered-harvest-science
> >
> Quote:
> And ROSINA, a Rosetta instrument that uses spectrometers to measure
> gas abundances, has obtained a highly sought after result: the
> so-called deuterium-to-hydrogen ratio of water in the comet's thin
> atmosphere, or coma. The measured value for 67P is much higher than
> the ratio in Earth's oceans and higher than in other comets, says
> ROSINA principal investigator Kathrin Altwegg, of the University of
> Bern. Three years ago, the comet Hartley-2 was found to have a D-to-H
> ratio near that of Earth's oceans--sparking interest in the notion that
> comet impacts delivered much of Earth's water. Altwegg says the result
> for 67P could make asteroids the primary suspect again.
> --------
>
> BillK
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