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  1. #1 Earth 
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    Why earth spins? Is there any exact reason of this??


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    Administrator KALSTER's Avatar
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    It is residual angular momentum from the proto-planetary disc. The rotation of the proto-planetary disc resulted for much the same reasons as water running down a drain all spinning in one direction.


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    Forum Ph.D. merumario's Avatar
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    it spins because it is a spherical object that its world line is bend towards that of more massive object and it circles it,and when onething circles another,there is an angular velocity. the clear reason is that everything in the universe is moving.
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    Forum Professor jrmonroe's Avatar
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    Quote Originally Posted by merumario View Post
    it spins because it is a spherical object that its world line is bend towards that of more massive object and it circles it,and when onething circles another,there is an angular velocity. the clear reason is that everything in the universe is moving.
    I don't know what the above statements mean, but along the lines of what KALSTER said, most scientists accept the Solar Nebular Model that describes a spinning mass that eventually differentiates itself into the Sun and the planets, moons etc. Because of the spin of this mass, virtually all bodies of the Solar System spin/orbit along the same axis and in the same direction as the original mass.
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    Forum Professor scoobydoo1's Avatar
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    Quote Originally Posted by jrmonroe View Post
    along the lines of what KALSTER said, most scientists accept the Solar Nebular Model that describes a spinning mass that eventually differentiates itself into the Sun and the planets, moons etc. Because of the spin of this mass, virtually all bodies of the Solar System spin/orbit along the same axis and in the same direction as the original mass.
    This actually helps clear up a question I had 4 months ago here.
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    Administrator KALSTER's Avatar
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    Quote Originally Posted by merumario View Post
    it spins because it is a spherical object that its world line is bend towards that of more massive object and it circles it,and when onething circles another,there is an angular velocity. the clear reason is that everything in the universe is moving.
    The spin of the earth is not directly attributable to it simply orbiting the sun. That only takes care of the earth's orbit round the sun.
    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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