[ExI] Double-Earth (Was: kepler study says 8.8e9 earthlike planets)

[Tomaz Kristan]

We are talking about the situation inside *Galaxy*. And why the Earth (or
Solar system) is that different.

Oxygen is the third with 1% of all the atoms. You can forget helium for its
neutrality.

http://en.wikipedia.org/wiki/Abundance_of_the_chemical_elements

The top one and the third one - (forget the helium, it does not bond
significantly) - love to join into water.

Our Galaxy must be very wet place.


On Fri, Nov 22, 2013 at 11:46 AM, Eugen Leitl <eugen at leitl.org> wrote:

> On Fri, Nov 22, 2013 at 11:26:27AM +0100, Tomaz Kristan wrote:
> > I think H2 must be the most frequent molecule, and H2O must be the
> second.
> > The third might be CO2, since the carbon is the number 4.
>
> http://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth's_crust
>
> O, Si, Al, Fe, Ca, Na, K, Mg, Ti, H, P etc.
>
> Sorry, neither hydrogen nor carbon are particularly abundant in
> Earth's lithosphere.
>
> Universe is different, obviously. There, it's mostly hydrogen,
> with a smattering of helium.
>
> > Anyway, we don't need to ask ourselves - where all this water came from.
> We
> > rather should ask - where almost all the water has gone?
> >
> >
> > On Fri, Nov 22, 2013 at 11:18 AM, Kelly Anderson <kellycoinguy at gmail.com
> >wrote:
> >
> > > On Fri, Nov 22, 2013 at 2:58 AM, Tomaz Kristan <protokol2020 at gmail.com
> >wrote:
> > >
> > >> I guess that a lot of water is a direct consequence of the fact, that
> the
> > >> oxygen is the number 3 most frequent element in the Galaxy. It likely
> > >> bounds with the number 1, hydrogen - and there is water. The number
> three,
> > >> helium doesn't bound.
> > >>
> > >> The real problem might be, why the Earth is so dry?
> > >>
> > >
> > > You may be spot on.
> > >
> > > I'm pretty sure I read somewhere that water was the most common
> molecule
> > > in the universe... but that doesn't tell you what percentage of the
> > > universe is expected to be made up of water though...
> > >
> > > -Kelly
> > >
> > >
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> >
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