| Topic: |
Science > Physics |
| User: |
"remove the os" |
| Date: |
17 Oct 2005 07:17:41 AM |
| Object: |
Rotational motion of planets |
Dear all
I was trying to figure out why essentially all objects in space, or at
least the planets, appear to have a rotational motion around their own
axes (the rotation that is responsible for the day/night cycles on the
earth). Although I must have learned that in a basic astronomy course, I
am not able to remember it any more, and hope somebody can refresh my
memories...
I understand that those planets where formed by contraction of large
dust clouds, and that those clouds must have had some initial overall
angular momentum which was conserved during contraction, thus
accelerating the rotation in the same way as an ice ballerina who draws
in her arms.
But still, I wonder where this initial angular momentum, even though it
is very feeble, comes from. Is it just a statistical fluctuation on the
distribution of angular momentum in the universe? Or has it a more
concrete physical origin?
This is probably a well-known topic, and I imagine that people have done
computer simulation to verify the theories. Can anybody point me towards
some corresponding publications?
Many thanks in advance for your help,
Jonas
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| User: "Jason Stanidge" |
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| Title: Re: Rotational motion of planets |
17 Oct 2005 05:13:29 PM |
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"remove the o's" <latoto@cui.unige.ch> wrote in message
news:43539665$1@nntp.unige.ch...
Dear all
I was trying to figure out why essentially all objects in space, or at
least the planets, appear to have a rotational motion around their own
axes (the rotation that is responsible for the day/night cycles on the
earth).
What are the chances of an object in the universe having zero rotation?
[snipped]
in advance for your help,
Jonas
.
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| User: "G=EMC^2 Glazier" |
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| Title: Re: Rotational motion of planets |
17 Oct 2005 05:19:23 PM |
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Jonas In the micro realm spin is used by all objects ,and is more
important than rotation in the macro realm. If an electron did not spin
it would not be an electron. The spinning micro world came before the
macro world. Bert
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| User: "CWatters" |
|
| Title: Re: Rotational motion of planets |
18 Oct 2005 02:51:43 AM |
|
|
"remove the o's" <latoto@cui.unige.ch> wrote in message
news:43539665$1@nntp.unige.ch...
Dear all
I was trying to figure out why essentially all objects in space, or at
least the planets, appear to have a rotational motion around their own
axes (the rotation that is responsible for the day/night cycles on the
earth). Although I must have learned that in a basic astronomy course, I
am not able to remember it any more, and hope somebody can refresh my
memories...
I understand that those planets where formed by contraction of large
dust clouds, and that those clouds must have had some initial overall
angular momentum which was conserved during contraction, thus
accelerating the rotation in the same way as an ice ballerina who draws
in her arms.
But still, I wonder where this initial angular momentum, even though it
is very feeble, comes from. Is it just a statistical fluctuation on the
distribution of angular momentum in the universe? Or has it a more
concrete physical origin?
Perhaps it's chaos theory at work? Perhaps you just need one particle in
the original gas cloud to have a bit of angular momentum for the resulting
distribution to be lumpy once it's condensed? Someone must have done the
simulations?
.
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| User: "Androcles Androcles@ MyPlace.org" |
|
| Title: Re: Rotational motion of planets |
17 Oct 2005 09:19:54 AM |
|
|
"remove the o's" <latoto@cui.unige.ch> wrote in message
news:43539665$1@nntp.unige.ch...
| Dear all
|
| I was trying to figure out why essentially all objects in space, or at
| least the planets, appear to have a rotational motion around their own
| axes (the rotation that is responsible for the day/night cycles on the
| earth). Although I must have learned that in a basic astronomy course,
I
| am not able to remember it any more, and hope somebody can refresh my
| memories...
|
| I understand that those planets where formed by contraction of large
| dust clouds, and that those clouds must have had some initial overall
| angular momentum which was conserved during contraction, thus
| accelerating the rotation in the same way as an ice ballerina who
draws
| in her arms.
|
| But still, I wonder where this initial angular momentum, even though
it
| is very feeble, comes from. Is it just a statistical fluctuation on
the
| distribution of angular momentum in the universe? Or has it a more
| concrete physical origin?
|
| This is probably a well-known topic, and I imagine that people have
done
| computer simulation to verify the theories. Can anybody point me
towards
| some corresponding publications?
|
| Many thanks in advance for your help,
| Jonas
Nobody knows. There are only theories, and every crackpot has his own
theory or has read someone else's theory and likes it.
http://spacekids.hq.nasa.gov/osskids/animate/uranus_small.jpg
"Tipped Uranus behaves as a giant top as it spins on an axis almost in
the plane of its orbit."
Androcles.
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