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Thread: Why dont Light stop at certain distance, in vaccum?

  1. #1 Why dont Light stop at certain distance, in vaccum? 
    precious sir ir r aj's Avatar
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    Everthing which has beginning has an end.

    Motion slows down and vanish finally due to inertia. There is no inertia in space.

    Light is a EM wave which moves in linear in space and reach our solar system from far far away galaxies. Why dont light stop in vaccum? why dont it end itself without being in contact with other matter bodies on the way?

    There is infinitely long tube filled with space (vaccum). If we throw light from one end and aim for its other end (infinitely impossible to reach there), where will light stop? Let's suppose there is no obstacle on the way. Its stupid to ask why there is no inertia in space. And I dont think light as a "thing". Whatever it is, why the hell it does not stop itself in space?

    Note : I am just curious. Whatever I had I have provided here so dont expect anything more scientific here. This is just a useless thought.


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  3. #2  
    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by sir ir r aj View Post
    Everthing which has beginning has an end.
    Does it?

    Motion slows down and vanish finally due to inertia.
    Quite the reverse. Inertia is what is described by Newton's First Law of Motion: "Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it." (Newton's Three Laws of Motion)

    In other words, motion keeps going unless you do something to stop it.

    There is no inertia in space.
    Yes there is.

    Light is a EM wave which moves in linear in space and reach our solar system from far far away galaxies. Why dont light stop in vaccum?
    Light only stops when it hits something and space is really, really empty.


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  4. #3  
    Life-Size Nanoputian Flick Montana's Avatar
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    If there is no force acting upon the photon to stop it, why would​ it come to a halt?
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    "Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us." -Calvin
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    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by Flick Montana View Post
    If there is no force acting upon the photon to stop it, why would​ it come to a halt?
    Cigarette break?
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  6. #5  
    Life-Size Nanoputian Flick Montana's Avatar
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    Quote Originally Posted by Dywyddyr View Post
    Quote Originally Posted by Flick Montana View Post
    If there is no force acting upon the photon to stop it, why would​ it come to a halt?
    Cigarette break?
    Are you suggesting photons like to light up?
    "Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us." -Calvin
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    Forum Professor astromark's Avatar
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    Quote Originally Posted by sir ir r aj View Post
    Everthing which has beginning has an end. [ 1 ]

    Motion slows down and vanish finally due to inertia. There is no inertia in space. [ 2 ]

    Light is a EM wave which moves in linear in space and reach our solar system from far far away galaxies. Why dont light stop in vaccum? why dont it end itself without being in contact with other matter bodies on the way? [ 3 ]

    There is infinitely long tube filled with space (vaccum). If we throw light from one end and aim for its other end (infinitely impossible to reach there), where will light stop? Let's suppose there is no obstacle on the way. Its stupid to ask why there is no inertia in space. And I dont think light as a "thing". Whatever it is, why the hell it does not stop itself in space? [ 4 ]

    Note : I am just curious. Whatever I had I have provided here so dont expect anything more scientific here. This is just a useless thought.
    ~ Your thoughts are never useless. They encourage a better understanding..
    [ 1 ] I do not think that is true.
    [ 2 ] I can not think of any item that has no inertia in space, none.
    [ 3 ] Nothing is what space is mostly, and nothing does not stop anything.
    [ 4 ] invalid question,. As we can test that light does not stop in a vacuum.
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  8. #7  
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    Quote Originally Posted by sir ir r aj View Post
    Everthing which has beginning has an end.

    Motion slows down and vanish finally due to inertia. There is no inertia in space.

    Light is a EM wave which moves in linear in space and reach our solar system from far far away galaxies. Why dont light stop in vaccum? why dont it end itself without being in contact with other matter bodies on the way?

    There is infinitely long tube filled with space (vaccum). If we throw light from one end and aim for its other end (infinitely impossible to reach there), where will light stop? Let's suppose there is no obstacle on the way. Its stupid to ask why there is no inertia in space. And I dont think light as a "thing". Whatever it is, why the hell it does not stop itself in space?

    Note : I am just curious. Whatever I had I have provided here so dont expect anything more scientific here. This is just a useless thought.
    "Motion slows down and vanish finally due to inertia." Do you really understand the word "inertia"?
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    Forum Professor Daecon's Avatar
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    I think you're thinking of friction, not inertia?

    There's no force acting on a photon to slow it down (gravity doesn't count in this scenario) so it'll keep going for ever and ever until it hits something.
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  10. #9  
    Moderator Moderator Markus Hanke's Avatar
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    Everthing which has beginning has an end.
    There is no such law in physics.

    Why dont light stop in vaccum?
    Because you cannot accelerate an object with zero rest mass; it always moves at exactly c. You can only redshift or blueshift photons, which is pretty much exactly what we observe.
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  11. #10  
    precious sir ir r aj's Avatar
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    Thank you all. Really satisfying answers.
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