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Was Proto-earth a Gas Giant ?
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Was Proto-earth a Gas Giant ? John Curtis 06-18-2006
Posted by John Curtis on June 18, 2006, 11:16 am
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 Comparing the cummulative mass of satellites to the mass of their
central gas giants produces a constant ratio of 0.0001 which is a
hundred times smaller than Moon to Earth ratio of 0.012:
http://www.spaceref.com/news/viewpr.html?pid=20099
This discepancy in ratios becomes smaller when viewed from
planet-evaporation-model standpoint, where terrestrial planets
lost their hydrogen-helium atmospheres to UV stripping:
http://hubblesite.org/newscenter/newsdesk/archive/releases/2003/08/text/
Reconstituting the lost H-He mass (98%) to original Earth
makes the Moon/Earth ratio 0.00025, which is more amenable to
reconciliation. John Curtis


Posted by Roger Bagula on June 18, 2006, 12:28 pm
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 Nice hypothesis!
As the Earth-Moon system is much further,
it would have taken a much longer time span to boil away
the lighter gases. Since such evaporation processes tend to enrich
the heavier isotopes it would predict
that the Earth's oceans should have an higher deuterium
to hydrogen ratio than otherwise found in the solar system.
John Curtis wrote:

>Comparing the cummulative mass of satellites to the mass of their
>central gas giants produces a constant ratio of 0.0001 which is a
>hundred times smaller than Moon to Earth ratio of 0.012:
>http://www.spaceref.com/news/viewpr.html?pid=20099
>This discepancy in ratios becomes smaller when viewed from
>planet-evaporation-model standpoint, where terrestrial planets
>lost their hydrogen-helium atmospheres to UV stripping:
>http://hubblesite.org/newscenter/newsdesk/archive/releases/2003/08/text/
>Reconstituting the lost H-He mass (98%) to original Earth
>makes the Moon/Earth ratio 0.00025, which is more amenable to
>reconciliation. John Curtis
>
>
>

Posted by John Curtis on June 24, 2006, 11:11 am
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Roger Bagula wrote:
>
> As the Earth-Moon system is much further,
> it would have taken a much longer time span to boil away
> the lighter gases. Since such evaporation processes tend to enrich
> the heavier isotopes it would predict
> that the Earth's oceans should have an higher deuterium
> to hydrogen ratio than otherwise found in the solar system.
>
High D/H ratios exist in meteors and short-period comets.
In contrast, ocean water is being constantly rejuvenated by
isotope exchange with primordial hydrogen, methane, H2S, etc.
http://www.euronuclear.org/info/encyclopedia/i/isotopeexchange.htm
High pressures inside protoearth facilitated the entrapment of
enormous reservoirs of solar gases below Earth's crust as illustrated
by helium-3:
http://www.soes.soton.ac.uk/staff/wjj/geol/geol.html
These primordial gases are being constanlty released into the
ocean by thousands of black smokers peppering the 70000 km
of midocean ridges:
http://www.pmel.noaa.gov/vents/chemistry/images/vents2.gif
John Curtis


Posted by =?x-user-defined?Q?=AB?= Paul on June 18, 2006, 1:17 pm
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John Curtis wrote:
>
> Comparing the cummulative mass of satellites to the mass of their
> central gas giants produces a constant ratio of 0.0001 which is a
> hundred times smaller than Moon to Earth ratio of 0.012:
> http://www.spaceref.com/news/viewpr.html?pid=20099
> This discepancy in ratios becomes smaller when viewed from
> planet-evaporation-model standpoint, where terrestrial planets
> lost their hydrogen-helium atmospheres to UV stripping:
> http://hubblesite.org/newscenter/newsdesk/archive/releases/2003/08/text/
> Reconstituting the lost H-He mass (98%) to original Earth
> makes the Moon/Earth ratio 0.00025, which is more amenable to
> reconciliation. John Curtis

I suspect that earth getting whacked by a mars sized object complicated the gas
evaporation process by liquefying and vaporizing most of the earth which then
coalesced to form the moon and earth's rocky surface.

Posted by Perplexed in Peoria on June 18, 2006, 2:16 pm
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> Comparing the cummulative mass of satellites to the mass of their
> central gas giants produces a constant ratio of 0.0001 which is a
> hundred times smaller than Moon to Earth ratio of 0.012:
> http://www.spaceref.com/news/viewpr.html?pid=20099
> This discepancy in ratios becomes smaller when viewed from
> planet-evaporation-model standpoint, where terrestrial planets
> lost their hydrogen-helium atmospheres to UV stripping:
> http://hubblesite.org/newscenter/newsdesk/archive/releases/2003/08/text/
> Reconstituting the lost H-He mass (98%) to original Earth
> makes the Moon/Earth ratio 0.00025, which is more amenable to
> reconciliation. John Curtis

Isn't there some kind of evidence related to the scarcity of Neon
and the isotopic ratio of of 22Ne to 20Ne? This supposedly shows
that the Earth never had a gas-giant-like atmosphere, and that even
if we had a somewhat lighter atmosphere to begin with, we definitely
didn't lose it by simple evaporation. I seem to recall this as being
evidence for a giant impact having created the moon and our current
atmosphere being the result of outgassing (with minor contributions
from cometary accretion). Sorry, I don't have links or details.

In any case, considering our moon to be just an exceptionally big
gas-giant moon doesn't work for other reasons. Gas-giant moons are
mostly ice, rather than rock. So you need to increase mass of both
Moon and Earth to get to your hypothetical pre-evaporation
proto-situation.



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