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Date: Mon, 01 Feb 2016 23:12:59 -0800
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Subject: Re: Moon was produced by head-on collision?
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Yousuf Khan wrote:
> 
> On 01/02/2016 5:27 PM, Steve Willner wrote:
> > In article <dPqdnSyaPpEcxjDLnZ2dnUU7-b3OydjZ@giganews.com>,
> >   Yousuf Khan <bbbl67@spammenot.yahoo.com> writes:
> >> My question is, if the isotopic evidence which was used to create the
> >> Theia Hypothesis in the first place, due to a previously perceived
> >> difference in isotopic abundances,
> >
> > The isotope ratios are _at least_ very similar, now seemingly
> > identical within measurement accuracy.  This tends to support the
> > Theia hypothesis.  If the Moon formed on its own and was somehow
> > captured by the Earth, it would be expected to have very different
> > isotope ratios.
> 
> The Moon capture hypothesis was only one such hypothesis. That one would
> still be excluded by this recent finding.
> 
> Other ones that would still be viable are the Fission hypothesis, where
> the Moon was once a part of the Earth, but due to an imbalance it
> pinched itself off of the Earth. This would certainly maintain identical
> isotope levels between the Earth and Moon.
> 
> Another one is the Condensation Hypothesis, which suggested that the
> Earth and Moon formed from the same section of the original solar system
> nebula. So basically the two worlds evolved together as a twin planet
> system. This would also pretty much maintain identical isotope levels.
> 
> This site even says that if the isotope levels are different, then the
> above theories would be unlikely, but now that the isotope levels are
> similar, those theories come back into play.
> 
> Theories of Formation for the Moon
> http://csep10.phys.utk.edu/astr161/lect/moon/moon_formation.html
> 
>         Yousuf Khan



The purpose of our moon is to make an ocean on earth.