Groups > sci.physics.relativity > #461296

Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ?

From	Sylvia Else <sylvia@not.at.this.address>
Newsgroups	sci.physics.relativity
Subject	Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ?
Date	2018-06-15 11:17 +1000
Message-ID	<fogie3Fbr2bU1@mid.individual.net> (permalink)
References	<B%TTC.402559$sc1.324555@fx09.am4> <86d8ec67-1634-446f-b63d-dc873060e795@googlegroups.com> <sGVTC.313795$Vs7.126493@fx41.am4> <fobalfFbskjU1@mid.individual.net> <AbEUC.458284$nr7.131711@fx31.am4>

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On 15/06/2018 10:59 AM, Keith Stein wrote:
> On 13/06/2018 02:34, Sylvia Else wrote:
>> On 13/06/2018 6:03 AM, Keith Stein wrote:
>>> I rather think Einstein DEFINED the speed of light to be constant.
>>> One problem with that approach is that if the speed of light in
>>> intergalactic space is actually slowing down, then you are going
>>> to think the universe is expanding, when in fact it isn't.
>>
>> This is a misstatement. In his special theory of relativity, Einstein 
>> takes as a postulate that the laws of physics are dependent only on 
>> relative velocities. One consequence of that is that the speed of 
>> light in a vacuum must be constant.
>>
>> But all that means is that the theory would be falsified if it were 
>> later determined by experiment that the speed of light in a vacuum is 
>> not constant. No such falsification has occurred
> 
>   Sylvia, there never has been, and never will be, an experimental
> determination of the speed of light in vacuum.  Intergalactic space
> is not a vacuum (although it is much closer to it than anything
> obtainable on Earth). The intergalactic medium is known to be mostly,
> but not entirely, Hydrogen. As the Universe evolves the intergalactic
> medium will no doubt evolve with it, so it is entirely feasible that
> the speed of light in intergalactic space is slowing down, and my
> guess is that it is. (by about 1 part in 14 billion per year)
> 
> keith stein
> 
> 
> 
It is not remotely reasonable to suppose that light behaves in a 
fundamentally different way just because there are a few atoms per cubic 
metre in the space traversed by the light.

Sylvia.

Thread

Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Keith Stein <keithstein111@gmail.com> - 2018-06-12 19:09 +0100
  Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Odd Bodkin <bodkinodd@gmail.com> - 2018-06-12 18:41 +0000
    Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Keith Stein <keithstein111@gmail.com> - 2018-06-12 20:38 +0100
      Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Edward Prochak <edprochak@gmail.com> - 2018-06-14 07:28 -0700
        Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Odd Bodkin <bodkinodd@gmail.com> - 2018-06-14 16:26 +0000
          Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Keith Stein <keithstein111@gmail.com> - 2018-06-15 01:31 +0100
            Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Volney <volney@volney.invalid> - 2018-06-14 23:27 -0400
            Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Odd Bodkin <bodkinodd@gmail.com> - 2018-06-15 14:35 +0000
            Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Edward Prochak <edprochak@gmail.com> - 2018-06-15 09:17 -0700
        Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-15 06:40 +0200
          Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Edward Prochak <edprochak@gmail.com> - 2018-06-15 09:28 -0700
            Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? dlzc <dlzc1@cox.net> - 2018-06-15 10:22 -0700
            Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-16 12:14 +0200
              Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Edward Prochak <edprochak@gmail.com> - 2018-06-17 17:32 -0700
  Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? dlzc <dlzc1@cox.net> - 2018-06-12 12:20 -0700
    Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Keith Stein <keithstein111@gmail.com> - 2018-06-12 21:03 +0100
      Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? dlzc <dlzc1@cox.net> - 2018-06-12 13:37 -0700
      Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Sylvia Else <sylvia@not.at.this.address> - 2018-06-13 11:34 +1000
        Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Keith Stein <keithstein111@gmail.com> - 2018-06-15 01:59 +0100
          Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Sylvia Else <sylvia@not.at.this.address> - 2018-06-15 11:17 +1000
            Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Volney <volney@volney.invalid> - 2018-06-14 23:40 -0400
          Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Volney <volney@volney.invalid> - 2018-06-14 23:33 -0400
      Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Sylvia Else <sylvia@not.at.this.address> - 2018-06-13 11:40 +1000
        Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-06-15 16:17 -0700
          Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Sylvia Else <sylvia@not.at.this.address> - 2018-06-16 20:27 +1000
            Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-06-16 05:40 -0700
      Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? "Dono," <sa_ge@comcast.net> - 2018-06-12 19:43 -0700
      Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? mitchrae3323@gmail.com - 2018-06-13 12:06 -0700
        Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Keith Stein <keithstein111@gmail.com> - 2018-06-13 21:47 +0100
          Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC  SPACE ? The Starmaker <starmaker@ix.netcom.com> - 2018-06-13 21:55 -0700
            Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC  SPACE ? dlzc <dlzc1@cox.net> - 2018-06-14 07:10 -0700
              Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC  SPACE ? Werner Ballard <db@ocowak.br> - 2018-06-14 15:54 +0000
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC  SPACE ? dlzc <dlzc1@cox.net> - 2018-06-14 09:25 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Keith Stein <keithstein111@gmail.com> - 2018-06-15 02:25 +0100
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Werner Ballard <db@ocoak.bn> - 2018-06-16 14:02 +0000
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-15 00:17 +0200
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? dlzc <dlzc1@cox.net> - 2018-06-14 15:34 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-15 01:13 +0200
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? dlzc <dlzc1@cox.net> - 2018-06-14 17:53 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-15 06:22 +0200
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? dlzc <dlzc1@cox.net> - 2018-06-15 06:44 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Werner Ballard <db@ocoak.bn> - 2018-06-15 14:32 +0000
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-16 10:00 +0200
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? dlzc <dlzc1@cox.net> - 2018-06-16 08:13 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Werner Ballard <db@ocoak.bn> - 2018-06-16 15:24 +0000
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2018-06-18 14:06 +0200
              Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC   SPACE ? The Starmaker <starmaker@ix.netcom.com> - 2018-06-14 10:30 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC   SPACE ? dlzc <dlzc1@cox.net> - 2018-06-14 11:52 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Volney <volney@volney.invalid> - 2018-06-14 15:08 -0400
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC  SPACE ? The Starmaker <starmaker@ix.netcom.com> - 2018-06-14 13:00 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Volney <volney@volney.invalid> - 2018-06-14 16:13 -0400
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC  SPACE ? The Starmaker <starmaker@ix.netcom.com> - 2018-06-14 13:55 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Volney <volney@volney.invalid> - 2018-06-14 17:22 -0400
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC  SPACE ? The Starmaker <starmaker@ix.netcom.com> - 2018-06-14 15:25 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Volney <volney@volney.invalid> - 2018-06-14 23:21 -0400
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC  SPACE ? The Starmaker <starmaker@ix.netcom.com> - 2018-06-15 12:25 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Volney <volney@volney.invalid> - 2018-06-15 18:06 -0400
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC  SPACE ? The Starmaker <starmaker@ix.netcom.com> - 2018-06-15 15:22 -0700
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Volney <volney@volney.invalid> - 2018-06-15 18:44 -0400
                Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC   SPACE ? The Starmaker <starmaker@ix.netcom.com> - 2018-06-15 15:54 -0700
  Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? The Starmaker <starmaker@ix.netcom.com> - 2018-06-12 16:26 -0700
  Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? "Dono," <sa_ge@comcast.net> - 2018-06-12 18:07 -0700
    Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Zandra Sobczak <acako@raswa.bo> - 2018-06-13 12:24 +0000
      Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Paparios <mrios@ing.puc.cl> - 2018-06-13 05:59 -0700
        Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Zandra Sobczak <acako@raswa.bo> - 2018-06-13 13:37 +0000
  Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? SolomonW <SolomonW@citi.com> - 2018-06-14 01:37 +1000
    Re: Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? Keith Stein <keithstein111@gmail.com> - 2018-06-13 21:31 +0100
  Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-06-13 16:13 -0700
    Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-06-13 16:20 -0700
      Is it possible to MEASURE the speed of light,iN INTERGALACTIC SPACE ? "David (Kronos Prime) Fuller" <fuller.david@hotmail.com> - 2018-06-13 16:22 -0700

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