[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

> 

> 

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