I guess this visualisation is at least fine to imagine how light has to travel 
through spacetime: 
http://www.esa.int/var/esa/storage/images/esa_multimedia/images/2015/09/spacetime_curvature/15576375-1-eng-GB/Spacetime_curvature.jpg
 
<http://www.esa.int/var/esa/storage/images/esa_multimedia/images/2015/09/spacetime_curvature/15576375-1-eng-GB/Spacetime_curvature.jpg>.


> Am 12.01.2018 um 19:33 schrieb John Clark <johnkcl...@gmail.com>:
> 
> 
> 
> On Fri, Jan 12, 2018 at 11:06 AM, <agrayson2...@gmail.com 
> <mailto:agrayson2...@gmail.com>> wrote:
> 
> For me, the problem is space vs spacetime. In LIGO, the recombined waves of 
> light show offsets due to different path lengths. So this seems to be a 
> differential distortion of space as the wave passes. So what has time got to 
> do with the phenomenon? AG
> 
> ​The gravity wave changes the time it takes for light to go down those 
> different paths, that's how we know the length i​n​ space must have changed 
> because the one thing that nothing can do, not even a gravity wave, is change 
> the speed of light in a vacuum.​ So its best not to think of space and time 
> as 2 seperate things, there is just spacetime.  ​
> 
> John K Clark
> 
> 
> 
> 
>  
> 
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