Planet Rotation: Questions & Answers

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    Planets Rotation
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A planet's rotation around its star typically aligns with the star's own rotation due to the conservation of angular momentum from the original cloud of dust and gas from which both formed. While most stars rotate, their speeds can vary significantly, influenced by factors like magnetic braking during formation, which can slow down rotation. Some planets, like Venus, exhibit retrograde rotation, while others, such as Uranus and Pluto, have unusual axial tilts. The reasons behind the varying rotation speeds of stars remain an active area of research. Overall, the relationship between a star's rotation and its planets is complex but rooted in their shared origins.
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I've read that a planet's rotation around it's star is in the same direction has the rotation of the star on itself, is that true? If so, why? Does it have something to do with the conservation of angular momentum?. And another question (well, two :P) : why do stars rotate (the outer layer, I mean)(And if it does, the inners?) ? And do all stars rotate? If not, why some do and some don't (four questions, I guess!)?
 
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_DJ_british_? said:
I've read that a planet's rotation around it's star is in the same direction has the rotation of the star on itself, is that true?
Generally, yes. But it is not a rule.

_DJ_british_? said:
If so, why? Does it have something to do with the conservation of angular momentum?.
Yes. The star and planets all condensed from the same cloud of dust and gas, and it is this cloud's initial rotation that is preserved.

_DJ_british_? said:
And another question (well, two :P) : why do stars rotate (the outer layer, I mean)(And if it does, the inners?) ?
See above.
_DJ_british_? said:
And do all stars rotate? If not, why some do and some don't (four questions, I guess!)?
Don't know of any that don't. Do you?
 
_DJ_british_? said:
I've read that a planet's rotation around it's star is in the same direction has the rotation of the star on itself, is that true?

Kind of true. It's the direction the planets have as they orbit the Sun because they condensed from the same rotating mass as the Sun. Less true for rotation on their axes, as Venus rotates retrograde and Uranus and Pluto are tipped over.

If so, why? Does it have something to do with the conservation of angular momentum?

Yes. It's also hard to reverse direction when you're a planet.

And another question (well, two :P) : why do stars rotate (the outer layer, I mean)(And if it does, the inners?) ? And do all stars rotate? If not, why some do and some don't (four questions, I guess!)?

They all do, some much, much faster than others. It's an active field of research as to how they get fast or slow. The Sun's sluggish rotation is probably due to magnetic braking during its formation. Through interacting with the disk of ionized gas around it, the Sun lost rotational energy like a gigantic "disk brake".
 
Just wanted to say thanks for ze info!
 

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