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Thomas de Groot <tho### [at] degroot org> wrote:
>
> For the image, in fact a snapshot somewhere in the middle of the LHB,
> this would mean (old) craters
>
"Samuel Benge" <stb### [at] hotmailcom> wrote:
>
> Time enough between impacts to, say, allow weathering and erosion to obscure
> previously formed craters?
>
.... yeah :)
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> Thomas de Groot <tho### [at] degrootorg> wrote:
>> On 3-7-2012 22:07, Samuel Benge wrote:
>>>
>>> Also, is this near the beginning of the LHB? If not, you might want to pock up
>>> the crust a bit with craters, and dirty up the sky with pulverized earth.
>>
>> I think that we should keep in mind the time scale of the whole event:
>> about 200 million years! That is a period of time equivalent to the one
>> since the late Triassic till today! Enough to severely rework the whole
>> Earth crust but it means also that the LHB, on a human time scale, was
>> not that "apocalyptic" in terms of impact frequencies.
>
> Time enough between impacts to, say, allow weathering and erosion to obscure
> previously formed craters?
Probably. At that time, there are some other violent events appening.
Many medium ans small impacts, volcanic activity, wind, caustic rain...
Also, the crust was much thinner back then, and possibly softer. Those
big impacts are sure to punch right through the crust to the magma
underneth. In those condition, the sides of the craters can readily melt
away before the temperature cools down enough and the crust reforms.
>
>> I second attempt at the impact, adding a scattering media (type 1) with
>> bozo density as simulation for the dust ejecta.
>>
>> Hm. Better but still not entirely convincing. I have been looking at the
>> df3 generation code of Gilles Tran but that is done within a regular box
>> which is not useful here...
>
> Why not? Wouldn't it be able to fit inside a cylinder?
>
> Found a couple daytime fireball photos, since references are always handy:
>
http://www.utahskies.org/image_library/shallowsky/meteors/fireball_burnett_big-apod20031001.jpg
>
http://www.theblaze.com/wp-content/uploads/2012/04/Screen-shot-2012-04-22-at-6.37.33-PM-620x367.png
>
> The second one went along with a news article about a loud explosion heard
> around my area that is suspected to have been a large meteor entering (and
> subsequently fragmenting) into the earth's atmosphere. (It's a stock NASA photo
> of another fireball.) I actually heard it with my own ears, but at the time
> figured it was just another of the many loud booming sounds that occur
> frequently around here. (People are always shooting their firearms nearby, and
> other explosions can be heard farther uphill that sound like a tunnel being dug
> [probably by those top-secret black helicopter types ;)].)
>
> Oh, and I was wondering, wouldn't the lake's water and the hills' dirt possibly
> be disturbed by the impact? I've seen aerial footage of accidental ground-level
> jet fuel ignition, and there's a discernible shock wave that precedes the
> visible above-ground explosion. Would that not also occur in this case?
>
That impact is located a few 100Km away. The shock wave is not yet
there, but when it arives in less that a minute, it's supersonic and
blistering hot. It's presure may be high enough to fracture some rocks.
If you where to stand there, you'd be torn apart and your pieces burnt
to a crist.
Alain
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On 5-7-2012 23:09, Samuel Benge wrote:
> Time enough between impacts to, say, allow weathering and erosion to obscure
> previously formed craters?
Indeed yes.
>> Hm. Better but still not entirely convincing. I have been looking at the
>> df3 generation code of Gilles Tran but that is done within a regular box
>> which is not useful here...
>
> Why not? Wouldn't it be able to fit inside a cylinder?
Gille's cloud generation typically generates...clouds ;-) Something else
would be needed here, but I think that I can still tweak my media enough
to get a better result. The container, as you can see, is not a simple one.
>
> Found a couple daytime fireball photos, since references are always handy:
>
http://www.utahskies.org/image_library/shallowsky/meteors/fireball_burnett_big-apod20031001.jpg
>
http://www.theblaze.com/wp-content/uploads/2012/04/Screen-shot-2012-04-22-at-6.37.33-PM-620x367.png
Yes indeed. Also, if you google for "meteor impact" images, you get a
number of artist's impressions of what I am after. Not all are good,
especially in relation to size, but I think the physics shown are about
right.
>
> The second one went along with a news article about a loud explosion heard
> around my area that is suspected to have been a large meteor entering (and
> subsequently fragmenting) into the earth's atmosphere. (It's a stock NASA photo
> of another fireball.) I actually heard it with my own ears, but at the time
> figured it was just another of the many loud booming sounds that occur
> frequently around here. (People are always shooting their firearms nearby, and
> other explosions can be heard farther uphill that sound like a tunnel being dug
> [probably by those top-secret black helicopter types ;)].)
<grin> Black helicopters he? You bet!
>
> Oh, and I was wondering, wouldn't the lake's water and the hills' dirt possibly
> be disturbed by the impact? I've seen aerial footage of accidental ground-level
> jet fuel ignition, and there's a discernible shock wave that precedes the
> visible above-ground explosion. Would that not also occur in this case?
Yes, absolutely. In fact, some of the images I mentioned show this shock
wave as a spherical shell around the blast. I remember seeing them too
in some documentaries (Probably Myth Blasters). I may add it in my image.
As far as the lake is concerned, Alain is right in saying it is seconds
away from receiving the blast. I got my time machine out just in time ;-)
Thomas
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On 6-7-2012 4:32, Alain wrote:
> Probably. At that time, there are some other violent events appening.
> Many medium ans small impacts, volcanic activity, wind, caustic rain...
> Also, the crust was much thinner back then, and possibly softer. Those
> big impacts are sure to punch right through the crust to the magma
> underneth. In those condition, the sides of the craters can readily melt
> away before the temperature cools down enough and the crust reforms.
Exactly.
> That impact is located a few 100Km away. The shock wave is not yet
> there, but when it arives in less that a minute, it's supersonic and
> blistering hot. It's presure may be high enough to fracture some rocks.
> If you where to stand there, you'd be torn apart and your pieces burnt
> to a crist.
Yeah. It needs good timing to watch this scene.... ;-)
Thomas
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From: Thomas de Groot
Subject: Re: Early Earth: The Late Heavy Bombardment [latest image]
Date: 6 Jul 2012 08:02:25
Message: <4ff6d3d1@news.povray.org>
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Maybe physically not entirely correct, but visually certainly attractive :-)
Thomas
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Attachments:
Download 'earlyearth - lhb_04.png' (781 KB)
Preview of image 'earlyearth - lhb_04.png'
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From: Paolo Gibellini
Subject: Re: Early Earth: The Late Heavy Bombardment [latest image]
Date: 6 Jul 2012 10:09:26
Message: <4ff6f196$1@news.povray.org>
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>Thomas de Groot on date 06/07/2012 14.02 wrote:
> Maybe physically not entirely correct, but visually certainly attractive
> :-)
>
> Thomas
Wow, the explosion begins to become /great/!
;-)
Paolo
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From: Thomas de Groot
Subject: Re: Early Earth: The Late Heavy Bombardment [latest image]
Date: 6 Jul 2012 10:31:47
Message: <4ff6f6d3$1@news.povray.org>
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On 6-7-2012 16:10, Paolo Gibellini wrote:
> Wow, the explosion begins to become /great/!
> ;-)
Thanks Paolo! I am rather happy with this so far. Again, it does not
need to be scientifically correct all the way but to suggest the impact.
A few more things to do.
Thomas
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From: Jörg 'Yadgar' Bleimann
Subject: Re: Early Earth: The Late Heavy Bombardment [latest image]
Date: 6 Jul 2012 17:42:45
Message: <4ff75bd5$1@news.povray.org>
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Hi(gh)!
On 06.07.2012 14:02, Thomas de Groot wrote:
> Maybe physically not entirely correct, but visually certainly attractive
If the impact is several hundred kilometres afar, its blast should not
obscure the high wispy clouds...
See you in Khyberspace!
Yadgar
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From: Alain
Subject: Re: Early Earth: The Late Heavy Bombardment [latest image]
Date: 6 Jul 2012 21:55:23
Message: <4ff7970b$1@news.povray.org>
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> Maybe physically not entirely correct, but visually certainly attractive
> :-)
>
> Thomas
Now you'r talking. Mostly incandecent ejectae. Not unrealistic if you
think a secong about just how much heat is released by that impact...
Then, there is all that heating from the huge supersonic shock wave.
Alain
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From: Alain
Subject: Re: Early Earth: The Late Heavy Bombardment [latest image]
Date: 6 Jul 2012 21:58:47
Message: <4ff797d7$1@news.povray.org>
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> Hi(gh)!
>
> On 06.07.2012 14:02, Thomas de Groot wrote:
>> Maybe physically not entirely correct, but visually certainly attractive
>
> If the impact is several hundred kilometres afar, its blast should not
> obscure the high wispy clouds...
>
> See you in Khyberspace!
>
> Yadgar
>
I agree. The top of the projection is probably climbing well abode those
clouds anyway, right up to the top of the statosphere, with some debrits
escaping back to outer space.
Alain
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