AW: Re-2: [meteorite-list] Moss Meteorite From A Comet?

[Martin Altmann]

Hi Ed,

not to dissapoint you,
but since decades the Chiemgau-impact is brought up again and again,
though until now not a sinlge scientific relevant proof was found or
delivered, neither for the presumed impact pits and craters,
nor for the recovered samples, which turned out to be terrestrial.

Best!
Martin

-----Ursprüngliche Nachricht-----
Von: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] Im Auftrag von E.P.
Grondine
Gesendet: Montag, 21. August 2006 15:53
An: meteorite-list at meteoritecentral.com
Betreff: Re: Re-2: [meteorite-list] Moss Meteorite From A Comet?

Hi Larry, List - 

It appears we have at least one other comet sample:
Cheimgau.

good hunting,
Ed


--- Larry Lebofsky <lebofsky at lpl.arizona.edu> wrote:


> Hi all:

> 

> Defending Tim Swindle and Humberto Campins. I have

> known them for years and 

> they are very conservative scientists. Their work is

> good and they are well-

> respected scientists. They do not go off (too often)

> to make wild, 

> unsubstantiated, claims., hence, the conclusions in

> their article. They based 

> their Meteorite paper (and their original scientific

> paper) on what we know. 

> We have observations of many comets (Campins has

> done a lot of this), but we 

> have "samples" from only one comet (Halley), are

> just now studying Stardust 

> material (so too early to say much), and IDPs which

> are thought to be, at 

> least in part, cometary in origin.

> 

> Clearly, we need multiple samples from multiple

> comets --- good luck in our 

> lifetime. Therefore you base your "theories" on the

> existing information, not 

> onwhat you hope to have in the future. That is why

> people propose new missions 

> to comets and asteroids!

> 

> We know that not all comets are the same based on

> our observations and where 

> we think they came from. Some of this may be because

> of how many times they 

> have been close to the Sun, some may have to be

> related to where they came 

> from (Kuiper Belt or Oort cloud), and some may have

> to do with where they were 

> formed (which may not have been where we see them

> coming from). Clearly, a 

> chunk of a "fresh" comet would look very different

> from a "dead" comet. Or, as 

> been on this listserv recently, could we tell the

> difference between a chunk 

> of a comet or a piece of Ceres? I am not sure I

> would be willing to say 

> anything in print even though I have studied Ceres

> for years. What, from 

> either, would we expect to make it through the

> atmosphere?

> 

> Even if we were to bring back samples from two or

> three comets, I doubt if 

> anyone I know would be willing to say (with respect

> to the composition of 

> comets) that that was their "final answer." That is

> the nature of science.

> 

> I really have to stop writing these a 5:00 in the

> morning, no breakfast and no 

> soffee, but this is the quiet time of the day.

> 

> Larry

> 

> 

> 

> Quoting bernd.pauli at paulinet.de:

> 

> > "Comets ... being 'primitive material' ... we

> would need

> >  to have known multiple samples of multiple comets

> before

> >  we could say for sure."

> > 

> > Hi Mark and List,

> > 

> > I couldn't agree more and that's why I felt a bit

> uneasy when I read

> > Campins' and Swindle's article in this issue of

> our METEORITE magazine:

> > 

> > CAMPINS H. and SWINDLE T.D.(2006) Where are the

> cometary

> > meteorites? (Meteorite, May 2006, Vol. 12, No.2,

> pp. 17-19).

> > 

> > They solely refer repeatedly to Comet Halley and

> to Halley dust (plus to

> > cometary IDPs). Many more comets need to be

> sampled before we can draw

> > definite conclusions!

> > 

> > Best,

> > 

> > Bernd

> > 

> > ______________________________________________

> > Meteorite-list mailing list

> > Meteorite-list at meteoritecentral.com

> >

>

http://six.pairlist.net/mailman/listinfo/meteorite-list

> > 

> 

> 

> ______________________________________________

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>

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> 



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