- #1

EclogiteFacies

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- Hi all, how 'real' is the simultaneity convention? Should we think of it as a mathematical tool rather than a physically definite description of the world?

Hi all,

I have been figuring out relativity. I was just wondering how meaningful the simultaneity convention is, how meaningful it is for say something a million light years away to be on our plane of simultaneity.

I'm guessing not very, we must really wait for light to get to use to have any idea of what's happening so far away.

Furthermore, us moving back and forth here can dramatically change our idea of simultaneity so far away. Of course this doesn't change the notion of now for an obsverer a million light years away..

So, I gather that simultentiety across huge distances is pretty meaningless and not something we should get hooked on. We instead acknowledge it as a mathematical representation but not a physical plane? Things so far away are not so simply organised into past and future.

Thanks!

I have been figuring out relativity. I was just wondering how meaningful the simultaneity convention is, how meaningful it is for say something a million light years away to be on our plane of simultaneity.

I'm guessing not very, we must really wait for light to get to use to have any idea of what's happening so far away.

Furthermore, us moving back and forth here can dramatically change our idea of simultaneity so far away. Of course this doesn't change the notion of now for an obsverer a million light years away..

So, I gather that simultentiety across huge distances is pretty meaningless and not something we should get hooked on. We instead acknowledge it as a mathematical representation but not a physical plane? Things so far away are not so simply organised into past and future.

Thanks!