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Thread: Why does earth rotate on its own axis?

  1. #1 Why does earth rotate on its own axis? 
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    Why does earth rotate on its own axis?


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  3. #2  
    Moderator Moderator Cogito Ergo Sum's Avatar
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    This link might be interesting:
    Curious About Astronomy: Why do planets rotate?


    "The only safe rule is to dispute only with those of your acquaintance of whom you know that they possess sufficient intelligence and self-respect not to advance absurdities; to appeal to reason and not to authority, and to listen to reason and yield to it; and, finally, to be willing to accept reason even from an opponent, and to be just enough to bear being proved to be in the wrong."

    ~ Arthur Schopenhauer, The Art of Being Right: 38 Ways to Win an Argument (1831), Stratagem XXXVIII.
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  4. #3  
    Universal Mind John Galt's Avatar
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    Residual angular momemntum from the formation process.
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  5. #4  
    Forum Radioactive Isotope sculptor's Avatar
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    OK
    stock answer if something is already spinning, then as the radius shrinks the speed increases
    angular momentum and all that

    Take is a step backward
    as cosmic dust clouds collapse into galaxies, solar systems, and planets what causes the original spin

    (wild guess du jour)
    Has something to do with the non uniform density within the dust clouds as they collapse while moving through space?
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  6. #5  
    Universal Mind John Galt's Avatar
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    Quote Originally Posted by sculptor View Post
    (wild guess du jour)
    Has something to do with the non uniform density within the dust clouds as they collapse while moving through space?
    Rather than a wild guess you could just read my prior post.
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  7. #6  
    Forum Radioactive Isotope sculptor's Avatar
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    this post?

    Residual angular momemntum from the formation process.
    seemed to be entering the building on the second floor
    what's in the lobby?

    why does the formation process lead to rotation-spin?
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  8. #7  
    has lost interest seagypsy's Avatar
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    because no other planets will let it rotate on their axis.
    adelady and Flick Montana like this.
    Speaking badly about people after they are gone and jumping on the bash the band wagon must do very well for a low self-esteem.
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  9. #8  
    Forum Radioactive Isotope sculptor's Avatar
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    original spin
    original sin

    no wonder everyone seems to be a tad on the dizzy side?
    jocular and babe like this.
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  10. #9  
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    Because it doesn't know its axis from a hole in the ground.
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  11. #10  
    Forum Radioactive Isotope sculptor's Avatar
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    from the above link in post 2
    All planetary and stellar systems are born from the collapse of dense interstellar clouds. The clouds may originally be very large (even thousands of light years across). Consider a portion of the cloud the collapses from a size of a light year or so to the size of the solar system. That is a huge change in the size of the system. So, the very slight rotation that the cloud has in the beginning is increased dramatically when the collapse takes place.
    Which, fails to address the causal factor of/for the "rotation that the cloud has in the beginning"
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  12. #11  
    Moderator Moderator Cogito Ergo Sum's Avatar
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    Quote Originally Posted by sculptor View Post
    from the above link in post 2
    All planetary and stellar systems are born from the collapse of dense interstellar clouds. The clouds may originally be very large (even thousands of light years across). Consider a portion of the cloud the collapses from a size of a light year or so to the size of the solar system. That is a huge change in the size of the system. So, the very slight rotation that the cloud has in the beginning is increased dramatically when the collapse takes place.
    Which, fails to address the causal factor of/for the "rotation that the cloud has in the beginning"

    Another link discusses the rotation of the initial nebular cloud in more detail:
    The Origin of the Solar System
    "The only safe rule is to dispute only with those of your acquaintance of whom you know that they possess sufficient intelligence and self-respect not to advance absurdities; to appeal to reason and not to authority, and to listen to reason and yield to it; and, finally, to be willing to accept reason even from an opponent, and to be just enough to bear being proved to be in the wrong."

    ~ Arthur Schopenhauer, The Art of Being Right: 38 Ways to Win an Argument (1831), Stratagem XXXVIII.
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  13. #12  
    has lost interest seagypsy's Avatar
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    I am going to take a guess at what causes the cloud to start spinning.


    looking at only two pieces of matter (stuff that has mass and therefore gravity).

    The two pieces of matter are flying through space at a certain speed in a straight line. Their paths come near enough to each other that they get caught in each other's gravitational field causing their straight trajectorys to curve in such a strong arch that they begin chasing one another in circles. As other pieces of matter also pass by they get caught in the same cat and mouse game as they are passing by each other's gravitational field. Over time all these pieces of mass gradually spin closer together and start speeding up. Just as you speed up as you fall from an airplane. The closer you are to the center of gravity the fast you move towards it. As all these pieces of matter get closer together some begin to merge into larger pieces and this continues until they are all one big solid ball of matter.

    Our planet and the other planets are chunks of mass that collected as a dust cloud swirled around the sun. If the paths of the planets intersected at closer ranges we would likely be able to be pulled into their gravitational field over time and two planets would become one.

    But that is just my layman's guess.
    Speaking badly about people after they are gone and jumping on the bash the band wagon must do very well for a low self-esteem.
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  14. #13  
    WYSIWYG Moderator marnixR's Avatar
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    Quote Originally Posted by seagypsy View Post
    because no other planets will let it rotate on their axis.
    dammit - you nicked my line !!
    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
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  15. #14  
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    Quote Originally Posted by Cogito Ergo Sum View Post
    Quote Originally Posted by sculptor View Post
    from the above link in post 2
    All planetary and stellar systems are born from the collapse of dense interstellar clouds. The clouds may originally be very large (even thousands of light years across). Consider a portion of the cloud the collapses from a size of a light year or so to the size of the solar system. That is a huge change in the size of the system. So, the very slight rotation that the cloud has in the beginning is increased dramatically when the collapse takes place.
    Which, fails to address the causal factor of/for the "rotation that the cloud has in the beginning"

    Another link discusses the rotation of the initial nebular cloud in more detail:
    The Origin of the Solar System
    from the link:
    Evidence for the Nebular Hypothesis
    Because of the original angular momentum and subsequent evolution of the collapsing nebula
    the causal factor remains elusive?
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  16. #15  
    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by sculptor View Post
    from the above link in post 2
    All planetary and stellar systems are born from the collapse of dense interstellar clouds. The clouds may originally be very large (even thousands of light years across). Consider a portion of the cloud the collapses from a size of a light year or so to the size of the solar system. That is a huge change in the size of the system. So, the very slight rotation that the cloud has in the beginning is increased dramatically when the collapse takes place.
    Which, fails to address the causal factor of/for the "rotation that the cloud has in the beginning"
    If the cloud were not spinning, that would mean that all the dust and molecules of gas were perfectly stationary until it started collapsing, at which point they fall directly towards the center in straight lines. Doesn't sound very plausible, does it.
    ei incumbit probatio qui dicit, non qui negat
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  17. #16  
    Administrator KALSTER's Avatar
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    For roughly the same reason that water spirals around the drain.
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

    "Gullibility kills" - Carl Sagan
    "All people know the same truth. Our lives consist of how we chose to distort it." - Harry Block
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  18. #17  
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    Quote Originally Posted by Strange View Post
    Quote Originally Posted by sculptor View Post
    from the above link in post 2
    All planetary and stellar systems are born from the collapse of dense interstellar clouds. The clouds may originally be very large (even thousands of light years across). Consider a portion of the cloud the collapses from a size of a light year or so to the size of the solar system. That is a huge change in the size of the system. So, the very slight rotation that the cloud has in the beginning is increased dramatically when the collapse takes place.
    Which, fails to address the causal factor of/for the "rotation that the cloud has in the beginning"
    If the cloud were not spinning, that would mean that all the dust and molecules of gas were perfectly stationary until it started collapsing, at which point they fall directly towards the center in straight lines. Doesn't sound very plausible, does it.
    No it does not sound/seem
    plausable

    we do know that spin is the norm
    the question of why, in the vastness of the universe, this should be the norm remains obscure
    true?

    ...................
    the earth spins, the sun spins, all of our studied planets spin,
    water, and weather move as a result of the earth's spin
    .......
    imagine for a moment that nothing was spinning
    and the universe was just beginning to expand
    somewhere in here, the spin began?

    why?
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  19. #18  
    Administrator KALSTER's Avatar
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    Quote Originally Posted by sculptor View Post

    we do know that spin is the norm
    the question of why, in the vastness of the universe, this should be the norm remains obscure
    true?
    Why does water "spin" around the drain as it flows out?
    Disclaimer: I do not declare myself to be an expert on ANY subject. If I state something as fact that is obviously wrong, please don't hesitate to correct me. I welcome such corrections in an attempt to be as truthful and accurate as possible.

    "Gullibility kills" - Carl Sagan
    "All people know the same truth. Our lives consist of how we chose to distort it." - Harry Block
    "It is the mark of an educated mind to be able to entertain a thought without accepting it." - Aristotle
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  20. #19  
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    Quote Originally Posted by KALSTER View Post
    Quote Originally Posted by sculptor View Post

    we do know that spin is the norm
    the question of why, in the vastness of the universe, this should be the norm remains obscure
    true?
    Why does water "spin" around the drain as it flows out?
    there's a good starting point laddy
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  21. #20  
    has lost interest seagypsy's Avatar
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    Quote Originally Posted by sculptor View Post
    Quote Originally Posted by KALSTER View Post
    Quote Originally Posted by sculptor View Post

    we do know that spin is the norm
    the question of why, in the vastness of the universe, this should be the norm remains obscure
    true?
    Why does water "spin" around the drain as it flows out?
    there's a good starting point laddy
    I think that has to do with the gravitational pull of the planet and the way it spins combined. because on the northern hemisphere water spins clockwise and on the southern hemisphere it spins counter clockwise.
    Speaking badly about people after they are gone and jumping on the bash the band wagon must do very well for a low self-esteem.
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  22. #21  
    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by seagypsy View Post
    because on the northern hemisphere water spins clockwise and on the southern hemisphere it spins counter clockwise.
    Nooooooo!

    "Random currents in the water completely overwhelm any tiny coriolis effect going on. Imperfections in the drain also have a larger effect."
    "[Dywyddyr] makes a grumpy bastard like me seem like a happy go lucky scamp" - PhDemon
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  23. #22  
    has lost interest seagypsy's Avatar
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    Quote Originally Posted by Dywyddyr View Post
    Quote Originally Posted by seagypsy View Post
    because on the northern hemisphere water spins clockwise and on the southern hemisphere it spins counter clockwise.
    Nooooooo!

    "Random currents in the water completely overwhelm any tiny coriolis effect going on. Imperfections in the drain also have a larger effect."
    There should be a rule that Science teachers have to clear everything they teach with actual scientists. Every science teacher I ever had told me about the north and south hemisphere thing.
    Speaking badly about people after they are gone and jumping on the bash the band wagon must do very well for a low self-esteem.
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  24. #23  
    Genius Duck Moderator Dywyddyr's Avatar
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    Mine too!
    "[Dywyddyr] makes a grumpy bastard like me seem like a happy go lucky scamp" - PhDemon
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  25. #24  
    Forum Professor astromark's Avatar
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    A long long time ago a British children's education program, they killed this myth dead.
    'Magness Magman' (* apologizes for spelling ) was sort of famous for his myth busting methods of science.. They had a live broadcast from South Africa and London. Might it have been 'The science Guy.'
    The drains test went the same way 5/10. Left or right.. Other factors started the rotation direction. That was some 45 years ago...
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