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What determines the speed at which a planet revolves?
    #3926571 -

I am very curious as to the answer to this.

The length of a single rotation of a planet... what is it determined by. I don't think its size because Earth (7926 mile diameter) rotates in about 24 hours, Mercury (3031 mile diamater) in about 58 days... etc.

Is it distance from the sun, anything related to orbit, I could go on with possibilities but I rather just receive an answer.

Thanks in advance

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Re: What determines the speed at which a planet revolves? [Re: Freeker]
    #3926661 -

i think it has to do with everything... the distance to the sun, the actual size of the planet (diameter)... but more than anything the mass of the planet... the gravitational forces on a planet that is almost entirely made of gas would be way less than the ones on a planet made of lead, even if they have the same diameter... if you get what i mean...
i also think that any other close objects have something to do with it... like moons, or other planets...


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Re: What determines the speed at which a planet revolves? [Re: In(di)go]
    #3926727 -

One can see that the earth spins faster when apache runs around it at full speed.


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Evolution of Time.

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Re: What determines the speed at which a planet revolves? [Re: Freeker]
    #3926851 -

To add to the confusion: Jupiter, the largest planet, has a rotational period of about 10 hours :wink:

As for what determines the exact speed...I don't think this is known yet. We still aren't entirely sure what causes planets/stars/ect to rotate, but we think it is a result of the initial material that the planet is made from rotating as it collapses.

Hmmm, and now you've got me thinking!

You know of the "coriolis effect"? It's what causes water to spiral down the drain instead of just falling straight out, and is caused by the rotation of the Earth itself. I wonder, then, if the rotation of planets/stars and other heavenly bodies is caused by the same type of force? After all, the entire Milky Way galaxy is rotating around the center...

And with that in mind, why does the Milky Way rotate? Might it be because the entire Universe is rotating?

Does anyone know the answer to this?


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Once, men turned their thinking over to machines in the hope that this would set them free.
But that only permitted other men with machines to enslave them.

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Re: What determines the speed at which a planet revolves? [Re: trendal]
    #3926901 -

shit that's a good theory you got going there... makes you ponder...


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Re: What determines the speed at which a planet revolves? [Re: trendal]
    #3926922 -

It shall henceforth be known as The Trendal Theory. :grin:


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Now go Home.

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Re: What determines the speed at which a planet revolves? [Re: In(di)go]
    #3926926 -

Someone must have come up with this idea already!

If rotational energy is provided by being IN a rotating inertial system...and everything in the Universe tends to rotate in this manner...then the Universe itself should be a rotating system.


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Once, men turned their thinking over to machines in the hope that this would set them free.
But that only permitted other men with machines to enslave them.

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Re: What determines the speed at which a planet revolves? [Re: trendal]
    #3926943 -

trendal said:
Someone must have come up with this idea already!



I know I'm just trying to boost your ego.  :wink:


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Now go Home.

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Re: What determines the speed at which a planet revolves? [Re: trendal]
    #3926949 -

:lol:

Never mind! I forgot about elliptical galaxies! Most of them don't even rotate!

A rotating universe would also mean the cosmic microwave background would appear different than it does.

Sorry guys :smirk:


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Once, men turned their thinking over to machines in the hope that this would set them free.
But that only permitted other men with machines to enslave them.

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Re: What determines the speed at which a planet revolves? [Re: trendal]
    #3926969 -

trendal said:
Someone must have come up with this idea already!

If rotational energy is provided by being IN a rotating inertial system...and everything in the Universe tends to rotate in this manner...then the Universe itself should be a rotating system.

well i definitely think the universe is a rotating system... but then the question is: what makes the universe rotate?


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Re: What determines the speed at which a planet revolves? [Re: trendal]
    #3926987 -

This is not to insult your intelligence, I was taught the very same thing in high school; the coriolis effect is a myth. I would imagine that the reason water spirals down a drain is because it is being squashed together as it funnels down, and there's less strain on the molecules if they travel to the side as well as down. Like if you squash a cylindrical piece of foam straight down, it will bend to one side, because that way it's compacted a bit less.

Anyway I know for sure coriolis effect is a myth. water spins down the toilet whichever way the toilet manufacturers make it spin. look up coriolis effect myth on google.


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Namaste

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Re: What determines the speed at which a planet revolves? [Re: Freeker]
    #3927026 -

I'm not sure exactly what determines speed of rotation but i'd venture to guess that at this point in the life of the planets/solar system it is due mainly to the fact that the larger a planet is the larger the momentum of its outerlayers.
As to how the rotation started I'd guess that it was a reaction to the tidal forces of the sun, and other concentrations of matter in the solar system, on initial clumps in the solar system that eventually came together to form planets. This would also be affected by the mass of the material, which would account for different periods of revolution.
At least those are my guesses only having a rudimentary knowledge of astronomy, coupled with fair knowledge of physics.

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Re: What determines the speed at which a planet revolves? [Re: RedNucleus]
    #3927106 -

The spin in a drain or toilet is determined by the construction of the drain. However, coriolis effect is a real thing that influences weather/wind patterns. I'm not sure about specifics.

As for Earth's spin, it shouldn't spin because of its or the sun/other planets' gravities. My educated guess is this:

The planets emerged from a disc of dust/gas orbiting the primordial sun as denser areas accumulated more and more matter, eventually forming clumpy pre-planets (not proven, but a popular theory). As matter accumulated into these balls, it came spiraling in because of its initial velocity being changed by the force of gravity. Probably from the beginning, the denser gas/dust pre-planets were slightly spinning. When the radii of these clumps became smaller (gravity pulling matter together), they spun faster and faster because of their angular momentum (think figure skater pulling in arms). Eventually, as most of the gas/dust found its way to different bodies and those bodies clumped together and their orbits became stable/nearly fixed, those chunks came to resemble the system and planets we have today.

I know I'm not the only one with these ideas. If you were to look, I bet you could find more info on solar system formation theories (try  wikipedia). I wouldn't doubt someone has done a computer simulation of this process, but I don't have it on hand. :wink:

-Kam

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Re: What determines the speed at which a planet revolves? [Re: Freeker]
    #3927114 -

It depends if your using an African or a European Swallow!


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The bus came by and I got on that's when it all began!


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Re: What determines the speed at which a planet revolves? [Re: kam]
    #3927148 -

Oh, and the reason the planets orbit suns/stars orbit galactic center/galaxies orbit galaxy clusters/clusters orbit larger clusters/etc.... is:

The sun pulled the pre-planets to it as they formed, but they also had some initial velocity not directly towards the sun, as well. This made them take spiral path's toward it, instead of straight ones. However, at some point in this spiral movement (which, I guess would really be a parabolic shape), they entered a shape close to that of the current elliptical orbits, which are pretty stable, and they have stayed in close, but slowly changing ellipses since.

Physics rocks.

-Kam

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Re: What determines the speed at which a planet revolves? [Re: RedNucleus]
    #3927165 -

Coriolis must be real because depending on which hemisphere you live in, the water goes down either clockwise or counterclockwise.

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Re: What determines the speed at which a planet revolves? [Re: Freeker]
    #3927178 -

And how much the coconuts weigh!


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The bus came by and I got on that's when it all began!


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Re: What determines the speed at which a planet revolves? [Re: Ripple]
    #3927182 -

I have no idea what you just said, but shine on anyway

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Re: What determines the speed at which a planet revolves? [Re: RedNucleus]
    #3927195 -

Yes you're right about the coriolis effect not causing the water to spiral, it's caused by the water rotating in the container in the first place. If you let the water settle, though, over 24 hours, it will rotate from the coriolis effect.

That's kinda beside the point though, I was talking about the coriolis effect itself. I still suppose it could be the cause of planet rotation, as the galaxy as a whole is rotating anything collapsing in it will feel some force.


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Once, men turned their thinking over to machines in the hope that this would set them free.
But that only permitted other men with machines to enslave them.

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Re: What determines the speed at which a planet revolves? [Re: trendal]
    #3927280 -

Maybe the milky way galaxy is rotating around some sort of spatial drain. The Universe is a sink of energy and matter (really just different densities of the same thing) and the milky way galaxy is just on top of a small drain that everything will spiral into (a spatial pipeline) to empty out on the other "side of the universe" which we could imagine as the top of the original sink. ( the "outside surface of the 'sink' universe") as in a fourth dimensional model of things. Wee!


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Spiral Dancer

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