Fly135 Posted July 21, 2022 Share Posted July 21, 2022 I've been confused about how red shift works. If I understand correctly when we look far out into the cosmos stars that are farther away are more red shifted. My question is... Does the red shift predominately come from the stars speed moving away from us, or does the light also red shift as it moves through an expanding universe? I.E. a combination of both factors. Given that it's said the expansion of the universe is accelerating, you would think that the further away you look (i.e. father back in time) that the red shift would be less. That is if the red shift entirely occurs when the light leaves the star. If the red shift also occurs as the light travels to us then I could understand that more red shift occurs the farther it travels. Link to comment Share on other sites More sharing options...
StringJunky Posted July 22, 2022 Share Posted July 22, 2022 The stars photons get more red-shifted as they travel through the expanding space. The longer they travel, the more RS they become. 1 Link to comment Share on other sites More sharing options...
Fly135 Posted July 23, 2022 Author Share Posted July 23, 2022 23 hours ago, StringJunky said: The stars photons get more red-shifted as they travel through the expanding space. The longer they travel, the more RS they become. Thank you for the answer. Link to comment Share on other sites More sharing options...
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