[meteorite-list] Extra-solar material?

From: Matthias Bärmann <majbaermann_at_meteoritecentral.com>
Date: Sat, 3 May 2008 20:05:19 +0200
Message-ID: <000701c8ad48$40077420$2a01a8c0_at_ibmtp23>

Hi Norbert, list , -

isn't presolar extrasolar too, in a certain sense?

See f.e.: http://www.psrd.hawaii.edu/Dec02/TagishLake.html

Best,

Matthias


----- Original Message -----
From: "Norbert Classen" <riffraff at timewarp.de>
To: "'Mark Crawford'" <mark at meteorites.cc>;
<meteorite-list at meteoritecentral.com>
Sent: Saturday, May 03, 2008 5:01 PM
Subject: Re: [meteorite-list] Extra-solar material?


Hi Mark,

The nano diamonds in Allende CAI's are considered to be samples of
extra-solar origin; at least they show isotopic values that don't match with
any of the other values measured for materials of our solar system
(including meteorites).

I believe there were studies of other (Antarctic) carbonaceous chondrites
which also were shown to be from other systems, but right now I don't
remember the exact publication. Should have been in MAPS, but I would have
to look this up, first. Bernd: do you have an idea where I might have read
about it?

But as far as I know no meteorite as such has been considered as
"extra-solar", so far - these are always inclusions, and most of them are
microscopically small.

All the best,
Norbert

-----Urspr?ngliche Nachricht-----

I'm reading Paul Davies' "The Fifth Miracle". In chapter 6 it refers to the
1996 discovery by Taylor, Baggaley and Steel of inter-stellar dust particles
entering the earth's atmosphere in the form of fast (>
70-km/s) meteors:

http://www.nature.com/nature/journal/v380/n6572/abs/380323a0.html

It got me wondering as to whether there are any candidates for meteorites
which may be of extra-solar origin. Are there any? How would they be
identified - a suspiciously long CRE age would perhaps be one indicator?

Mark

--
Mark's Meteorite Pages: http://meteorites.cc
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Received on Sat 03 May 2008 02:05:19 PM PDT