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From: The Starmaker <starmaker@ix.netcom.com>
Newsgroups: sci.astro,sci.physics
Subject: Re: Moon was produced by head-on collision?
Date: Sun, 31 Jan 2016 09:44:27 -0800
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Yousuf Khan wrote:
> 
> Moon was produced by head-on collision | Astronomy.com
> http://www.astronomy.com/news/2016/01/moon-was-produced-by-head-on-collision
> 
> The Theia Theory used to talk about a glancing blow between the early
> Earth and a Mars-sized Theia, perhaps at 45 degrees. New data suggests
> that Theia might have actually hit head-on with the Earth. That's
> because the percentage of Oxygen 16/17/18 isotopes between the Earth and
> Moon are nearly identical, indicating that they came from the same source.
> 
> 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, so now that that isotopic evidence
> has disappeared, why keep the Theia Hypothesis? There were other
> theories prior to that, which were discarded due to the isotopic evidence.
> 
>         Yousuf Khan


The truth is...the origin of our solar system is...unknown.



So, how everthing got put together is unknown...including the moon.

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