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Trish
SFN Addict
USA
2102 Posts |
 Posted - 05/25/2004 : 10:49:50
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I'm currently in an argument with a creationist elsewhere that claims if all the planets were formed naturally in our solar system they would all have the same make up. Additionally, he is making the claim that if all planets and their moons were formed the way science says that planets wouldn't have moons that travel in different directions. I don't recall ever hearing that some planets have moons travelling in opposite directions. I'm seeking confirmation on that bit of info, before I say anything regarding it. I've asked him for a list of the planets and moons, etc. But he notoriously resists answering direct questions.
I need to clarify my information before I respond. Specifically: the composition of the accretion disk during the formation of our solar system. How the gaseous planets formed beyond the heavier rocky planets. Captured satellites, generally being non-spheroidal in nature. Planetesimals and their accretion into the rocky planets. The lighter gasses being far enough out that they were able to form the gaseous planets while not being drawn into the sun.
A couple of good websites with diagrams would be helpful too. I'm looking on my own, just thought I'd get a bit of help with this part of the argument.
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...no one has ever found a 4.5 billion year old stone artifact (at the right geological stratum) with the words "Made by God."
No Sense of Obligation by Matt Young
"Say what you will about the sweet miracle of unquestioning faith. I consider the capacity for it terrifying and vile!"
Mother Night by Kurt Vonnegut, Jr.
They (Women Marines) don't have a nickname, and they don't need one. They get their basic training in a Marine atmosphere, at a Marine Post. They inherit the traditions of the Marines. They are Marines.
LtGen Thomas Holcomb, USMC
Commandant of the Marine Corps, 1943
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Starman
SFN Regular
Sweden
1613 Posts |
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Dr. Mabuse
Septic Fiend
Sweden
9688 Posts |
Posted - 05/26/2004 : 08:09:58 [Permalink]
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<blockquote id="quote"><font size="1" face="Verdana,Arial,Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Trish
I need to clarify my information before I respond. Specifically: the composition of the accretion disk during the formation of our solar system. How the gaseous planets formed beyond the heavier rocky planets. Captured satellites, generally being non-spheroidal in nature. Planetesimals and their accretion into the rocky planets. The lighter gasses being far enough out that they were able to form the gaseous planets while not being drawn into the sun.
[/quote]
From the top of my head:
* The composition accretion disk was probably fairly homogeneous from the beginning.
* When the sun had contracted enough in the center to ignite, it emitted a dense solar wind, also known as a T-Tauri-wind (observed in other new-born star-systems). This solar wind blew away parts of the hydrogen and other light-weight molecules left in the accretion disc.
* The heat from the newborn sun was above zero degrees Celcius somewhere inside Jupiter's orbit. Volatile compounds like water, carbon dioxide, ammonia, methane and other "liquids" and gasses vaporised and was blown out far enough to condensate and/or crystallise. (the sun was 30% more intense before ignition than now)
* All planets began with a core roughly similar to Earth in composition, like the inner planets. The outer planets, the Gas Giants, kind of vacuum-cleaned up the volatiles that was in the outer parts of the accretion disk.
* Jupiter (and to some extent Saturn) also vacuum-cleaned up the gasses blown out from the inner parts of the system. Hence the size...
Asteroids' lack of spherical shape:
* Asteroids didn't have enough mass. With not enough gravitational force, a molten or semi-molten piece of rock wouldn't collapse into a sphere due to the viscosity of the rock.
* Besides, a minor impact would deform a sphere, and since an aspherical surface containing the same volume is greater than a spherical one, cooling increases thanks to an increase in radiating surface.
* The sun contains large amounts of elements heavier than helium. Not in relative terms of the solar mass, but compared to the planets.
Edited for clarification, changes colour-marked. |
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| Edited by - Dr. Mabuse on 05/26/2004 22:40:31 |
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Trish
SFN Addict
USA
2102 Posts |
Posted - 05/26/2004 : 09:51:26 [Permalink]
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Thanks for the info. I think that I may be discontinuing the argument. I'm rather tired of the ad hom's being hurled my way. He hurls one everytime I ask his to show evidence that his god exists before claiming that his god did something.
I don't know yet though, I might give it a couple days. |
...no one has ever found a 4.5 billion year old stone artifact (at the right geological stratum) with the words "Made by God."
No Sense of Obligation by Matt Young
"Say what you will about the sweet miracle of unquestioning faith. I consider the capacity for it terrifying and vile!"
Mother Night by Kurt Vonnegut, Jr.
They (Women Marines) don't have a nickname, and they don't need one. They get their basic training in a Marine atmosphere, at a Marine Post. They inherit the traditions of the Marines. They are Marines.
LtGen Thomas Holcomb, USMC
Commandant of the Marine Corps, 1943
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