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

[Tomaz Kristan]

Henrique:

> Correct me if I'm wrong but I think I've read somewhere that Earth's
water comes from comets and asteroids.

Yes, so they say. But for every iron atom in the universe, there is at
least one molecule of water. So, a 100 to 1000 km deep ocean is unaccounted
for on this planet. The problem is where all the water went. Not from where
this water came from.

> And that Jupiter and Saturn attract most of the comets and asteroids to
themselves. Put the two together and then we end up with tiny moon Europa
having more than two times the water Earth has.

Exactly.


On Mon, Nov 25, 2013 at 4:23 PM, spike <spike66 at att.net> wrote:

>
>
>
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> *>…* *On Behalf Of *Anders Sandberg
>
>
> >…There are other expanding liquids like beryllium difluoride, but most
> are elements like silicon, bismuth, antimony, gallium and plutonium…
>
>
>
> Ja.  I can’t think of any life forms that depend on that oddball
> characteristic of water ice.  Perhaps the remarkable thing here is that
> with all the ice on this planet, there are no known (to me) life forms that
> use it in its solid phase.  One would think there would be a snow eater
> somewhere.  Clearly it wouldn’t be to extract energy from the water (ground
> state compound) but rather some kind of life form that can plant itself in
> snow and use sunlight.
>
>
>
> >… Even I agree that a planet with plutonium oceans is unlikely to be
> habitable for life. -- Dr Anders Sandberg
>
>
>
> I learned a new thing by thinking about this.  There is an isotope of
> plutonium which is non-fissile, 244.  Get a sphere of the stuff, heat it to
> 900 and some Kelvin, you have an ocean of plutonium, with radioactive
> particles up the kazoo but no fission.  Until Anders’ offhanded comment
> about an ocean of plutonium, I never knew there was such a critter.  Ain’t
> science kewallll?  {8-]
>
>
>
> spike
>
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>
>
>
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>


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