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(meteorobs) Re: Excerpts from "CCNet 97/2000 - 28 September 2000"
--- Phil Plait <badastro@badastronomy.com> wrote:
>
> Hello--
>
> My comment on CCNet about compressional heating is
> what I determined after a lengthy talk with John
> Lewis as well as reading Opik and a few other texts.
> Oberg's comments are basically correct; also,
> meteorites tend to have ablated material cooled and
> hardened on their 'back' side, indicating a
> relatively low amount of friction with oncoming air.
>
> If anyone has more, I'd love to hear it. Dispensing
> astronomy myths is literally my business! ;-)
>
> - -Phil Plait
Good information, Phil.
You could have a long & busy career "Dispensing [with]
astronomy myths", particularly when it is related to
meteorites.
The fusion crust on the "back" side of meteorites,
that you spoke of, is particularly well-developed on
'oriented' stones. Here, the fusion crust tends to
accumulate and may even boil, until the dark-phase
portion of the stones fight is achieved, at which time
the crust will start to cool and become hardened, many
times still retaining the bubbles that formed a frothy
mass. It's not all that uncommon. I've even found
evidence for this in two of the meteorites that I have
found. There are some images that attempt to show
this on the following URLs:
http://bolidechaser.tripod.com/lucerne/lv015-p1.htm
http://marzmeteorite.tripod.com/la/la-002/la002img.htm
Which is the only image of the "backside" of LA 002 on
this web page:
http://marzmeteorite.tripod.com/la/la-002/la002img.htm
I have other examples, but I don't have images readily
available for them.
-- Bob V.
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