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Thread: Gravitational Forces

  1. #1 Gravitational Forces 
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    Could gravitational force's distort are perception of distance in the universe?

    After losing all gravitational pull's would it cause space to act different? Maybe allowing faster travel for objects or light?


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  3. #2  
    Time Lord zinjanthropos's Avatar
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    Quote Originally Posted by notwen View Post
    Could gravitational force's distort are perception of distance in the universe?
    Sorry bud but I have more questions than answers. Here's a thought I had years ago when I first heard of the balloon analogy: If I think of two bodies in space as if they are dots on the surface of a balloon then there is a specific distance between them along said balloon's membrane. If I were to press down on the dots with my fingertips then the distance between them along the membrane increases because the membrane is stretched. However because the dots are on a sphere, the more pressure I give them the closer the dots (fingertips) become, not along the membrane but within the inner sphere. In fact you can press the dots with your fingertips until they touch. Well at least both ends of the stretched membrane containing the dots come in contact. If I can cut through the membrane as if it is another dimension then it certainly looks like I will shorten the distance travelled between the dots than if I went along the stretched membrane. Crazy or what?


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    Yes. We measure distance by redshift and gravity causes the same redshift as recessional velocity.

    About a decade ago someone announced that they had found something moving away from us faster than light. i guessed immediately that gravitational redshift was involved and that turned out to be the case, with that and recession pushing the total over light speed redshifting.

    Quasars have large black holes at their centre and would be ideal candidates for this, so maybe all are not so far away as is now thought.

    GRB's are the same. Supposedly incredibly violent and incredible distances away, but if not so far away as all are thought to be, then maybe just violent events.
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    Moderator Moderator Dishmaster's Avatar
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    I will reply later in more detail. In the meantime, I recommend reading the following:
    Cosmic distance ladder - Wikipedia, the free encyclopedia
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    Moderator Moderator Dishmaster's Avatar
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    Cyberia,
    please do not hijack threads in order to promote your own views of what you think is science, unless you have something substantial to add to the original question. Also, back up your claims and arguments with references.

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    Dishmaster. "Hijack" as in give different opinions to your own? I thought this was supposed to be a forum for debate yet here you are yet again trying to censor debate here. Even you must know that what I have said about gravitational redshift being indistinguishable from recessional redshift is true, so not just "my view".

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    Cyberia, you are on thin ice. We have the new hypotheses forum for discussion of ideas that are outside the scientific mainstream. Your contributions here are more disruptive than helpful.
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  9. #8  
    Moderator Moderator Dishmaster's Avatar
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    Gravitational lensing might mimick a closer distance of an object by amplifying its aparent brightness. In addition, such an amplification is independent of wavelength. Yes, gravitational redshift exists. However, it cannot be responsible for a misinterpretation of the cosmological redshift, because light becomes blueshifted, when it enters a gravitational well and redshifted, when it leaves it. So, the net effect is zero. A redshift is only measurable, if the light originates from a gravitational well like a star or a neutron star, not when passing it.

    I am afraid that zinjanthropos is stretching the rubber balloon analogy too far (pun intended). It is not a physical model, only a visualisation of certain concepts like expansion of space. Even if the idea of indents in the balloon surface would be a correct analogy, this would imply very localised and highly concentrated massive amounts of matter. Even supermassive black holes would like lightweights in comparison.
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