- #1
DLuckyE
- 44
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I'm a bit confused about redshift and the apparent increase in acceleration. If I understood it correctly redshift is caused by the expansion of the universe (space itself).
What I don't understand though, if galaxies further away have a higher increase in redshift vs distance than galaxies closer to us, then how do we get from that to the conclusion that the expansion is accelerating?
I must be missing something, but wouldn't that mean it was actually slowing down since light that has been traveling longer has a higher increase in redshift than light that has been traveling for a shorter period? I'm assuming that if the expansion is at a steady rate the increase would be linear since light would be continuously stretched out over the whole journey?
Can someone please point out where I'm making the error? ;)
What I don't understand though, if galaxies further away have a higher increase in redshift vs distance than galaxies closer to us, then how do we get from that to the conclusion that the expansion is accelerating?
I must be missing something, but wouldn't that mean it was actually slowing down since light that has been traveling longer has a higher increase in redshift than light that has been traveling for a shorter period? I'm assuming that if the expansion is at a steady rate the increase would be linear since light would be continuously stretched out over the whole journey?
Can someone please point out where I'm making the error? ;)