- #1
Riffraff
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Hello everyone!
Ok so from what I've read in various textbooks & wiki is that the red-shift of observed galaxies is caused by the expansion of space through which the light travels (naively seen as galaxies moving away from us and causing a doppler shift).
This got me thinking that if 'our space' around us expands with the same rate we wouldn't notice such effect. Then I read that inside gravitionally bound systems, objects aren't subject to the general expansion of space. Now this obviously expains why we can observe the redshift, but why does this occur in the first place?
Thanks, Riffraff
Ok so from what I've read in various textbooks & wiki is that the red-shift of observed galaxies is caused by the expansion of space through which the light travels (naively seen as galaxies moving away from us and causing a doppler shift).
This got me thinking that if 'our space' around us expands with the same rate we wouldn't notice such effect. Then I read that inside gravitionally bound systems, objects aren't subject to the general expansion of space. Now this obviously expains why we can observe the redshift, but why does this occur in the first place?
Thanks, Riffraff
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