[meteorite-list] Questions about accretion.

[Julie Brown]

----- Original Message ----- 
From: "Meteorites USA" <eric at meteoritesusa.com>
To: <GeoZay at aol.com>; <meteorite-list at meteoritecentral.com>
Sent: Sunday, April 05, 2009 3:52 PM
Subject: Re: [meteorite-list] Questions about accretion.


> Thanks for the responses thus far...
> 
> I've studied lots of material and scientific papers on accretion, but 
> still have some questions. The gravity explanation is great, but it's a 
> little vague. I want to know what causes it I guess at the molecular 
> level. What physical forces and interactions cause the iron to migrate 
> into such a solid mass at the core?
> 
> If gravity alone were the case, why is it we have H and L chondrites at 
> all? Everything would be one big clump of mixed material. Has the iron 
> not had a chance yet to migrate out of this layer of rock to the center 
> of the asteroid? I know H and L chondrites are meteoroids that have 
> broken off the parent bodies but my question is simply, had they not 
> been blasted off the main body, how long would it take and in what 
> manner would the iron have migrated from these layers of rock to the 
> core? Iron doesn't just move through stone without some sort of catalyst 
> or outside force does it? Gravity itself is not sufficient to move iron 
> through a stone matrix no matter how much time passes is it? If there 
> are no impacts or outside forces acting upon the body how does the iron 
> loose itself from the grasp of the stone matrix to move through toward 
> the core? Impacts?
> 
> At the beginning of the formation of a meteoroid is it electrostatic 
> attraction that causes it to get larger? At what size does it produce 
> it's own gravity? Or does it? How does and asteroid become so dense? If 
> asteroids are super dense, and comets are loosely bound material and 
> gases, would that mean that asteroids are dead comets?
> 
> Wow! I know that a lot of questions. sorry... ;)
> 
> Eric
> 
> 
> ______________________________________________
> http://www.meteoritecentral.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list
>