[meteorite-list] CAI and chondrules

From: Alexander Seidel <gsac_at_meteoritecentral.com>
Date: Thu, 01 Oct 2009 21:57:35 +0200
Message-ID: <20091001195735.64520_at_gmx.net>

>From my layman?s perspective and point of view: isn?t it interesting to note that there is still **so much** controversy over chondrule formation, those little round objects which are so evident and very clearly visible in many of the meteorites in our collections, while at the very same time all the basic physical conditions and evolutionary laws even on small timescales seem to be quite well understood? But then again all the many empirical facts obviously still have to come under serious scrutiny to finally have, at best, sort of a "generally accepted truth" emerge: a mainstream theory of chondrule formation that will be agreed upon by most scientists - one of these days.

Fascinating, especially in this era where many "basic" things seem to be understood! I?m excited to learn more about this, as time goes by... :-)

Alex
Berlin/Germany


-------- Original-Nachricht --------
> Datum: Thu, 01 Oct 2009 14:52:08 -0400
> Von: Jeff Grossman <jgrossman at usgs.gov>
> An: meteorite-list at meteoritecentral.com
> Betreff: Re: [meteorite-list] CAI and chondrules

> I didn't say "we don't know cr*p"... I said there
> was not a definitive answer. We know a lot about
> the timing, materials, and physical conditions
> needed to make chondrules and CAIs, and people
> have used these to make models for their
> formation. But many of these constraints are
> under scrutiny right now, and some pretty basic
> things are still controversial. What this means
> is... ok, we don't know cr*p. But progress is being made.
>
> Jeff
>
>
> At 02:39 PM 10/1/2009, Sterling K. Webb wrote:
> >Hi, Carl, Francesco, Jeff, List,
> >
> >Wrong, Carl. A good solid "We don't know
> >crap about this yet; it's all up in the air"
> >is the best kind of definitive answer.
> >
> >There are probably a half-dozen scenarios
> >for how this data came about and there's few
> >reasons to choose any one over the others.
> >
> >I was glad to hear Jeff confirm it.
> >
> >
> >Sterling K. Webb
> >-----------------------------------------------------------
> >----- Original Message ----- From: "Carl 's" <carloselguapo1 at hotmail.com>
> >To: <meteorite-list at meteoritecentral.com>
> >Sent: Wednesday, September 30, 2009 5:49 PM
> >Subject: Re: [meteorite-list] CAI and chondrules
> >
> >
> >
> >Ahhh! Good questions, Francesco. I had been
> >wondering about CAIs and chondrules myself. None
> >of the books I've read explains,how?
> >
> >Thanks also for your answer, Jeff. While not
> >definitive, it seems to be the only answer at this time. Thank you.
> >
> >Carl
> >
> >
> >Jeff Grossman wrote:
> >>...
> >
> >Definitive answers to what caused the formation of CAIs and chondrules
> >are not known.
> >
> >_________________________________________________________________
> >Bing? brings you maps, menus, and reviews
> >organized in one place. Try it now.
> >http://www.bing.com/search?q=restaurants&form=MLOGEN&publ=WLHMTAG&crea=TEXT_MLOGEN_Core_tagline_local_1x1
> >______________________________________________
> >http://www.meteoritecentral.com
> >Meteorite-list mailing list
> >Meteorite-list at meteoritecentral.com
> >http://six.pairlist.net/mailman/listinfo/meteorite-list
>
> Dr. Jeffrey N. Grossman phone: (703) 648-6184
> US Geological Survey fax: (703) 648-6383
> 954 National Center
> Reston, VA 20192, USA
>
>
> ______________________________________________
> http://www.meteoritecentral.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list
Received on Thu 01 Oct 2009 03:57:35 PM PDT