My understanding is that the geology of that area is karst (i.e.
limestone) , which forms in rectangular blocks. The transfer of the
energy of the explosion was enhanced in some direction and not in
others... resulting in the squarish shape.
Mark Abbott
Walter Branch wrote:
Hello Everyone,
I have had plenty of time recently to ponder things such as
meteorites. I am also alone at home at present and am bored. Would
some kind, more-knowledgeable-than-me soul help me with some
meteoritical questions.
For example, why does the rim of meteor crater appear "squared" in
some photos, while in others it appears very round? Perspective?
Lighting? Extremely highly localized tectonic shifting (back and forth)?
Also, why is Tatahouine so green? Olivine? Krylon?
I am looking at a slice of NWA 4664 right now (thank you Eric Olson)
and I don't see any much green. Maybe that one is a bad example
because NWA 4664 doesn't even look like at Diogenite!
Also, I have read that some meteoroids travel through space in streams
and impact the Earth simultaneously (i.e., they have already broken up
before they hit the Earth's atmosphere). How can this be? I would
think that once a meteoroid has broken in space (most likely due to
impact), minute deviations of the individual pieces in the initial
trajectory would translate into ever increasing deviations in the
individual piece's trajectory, over time. Unless two pieces were
traveling in EXACTLY parallel lines, over time the pieces would be
widely dispersed in space.
Remember comet Shoemaker-Levy 9? It was broken apart by gravitational
forces from Jupiter only a year prior to impact, yet by the time it
had encountered the Jovian atmosphere the separation between the
pieces was wider than the diameter of the Earth! After only a year.
Traveling over eons to make it to the inner solar system, how can a
meteoroid stream stay intact enough to cause a tiny strewnfield on the
Earth? I would not think that the Earth's gravitational field would be
strong enough to do what Jupiter did.
Also, I know I have asked this before but I still don't understand how
researchers can determine cosmic ray exposure ages for a meteorite
which ablated a significant portion of the material that absorbed most
of the cosmic rays and which may have fragmented in flight through the
Earth's atmosphere.
Anyone?
-Walter Branch
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