- #1
gamblej
- 1
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I am not a physicist so I was wondering if it is possible to explain the following question to a layman.
My information on this is subject to the whims of pop-sci journalists so if the answer will go over my head, that's OK. I'm still curious.
The further a galaxy is from us, the more distant back in time its light was sent. So those near the visible horizon of our universe that are truly hauling *** were hauling *** away from us 10 billion years ago. What about today? Couldn't a distant galaxy's relative velocity be a function of time rather than distance? How do cosmologists decouple these factors to arrive at the correct result (that our universe's expansion is accelerating)?
Thanks for any insight you can provide! :)
My information on this is subject to the whims of pop-sci journalists so if the answer will go over my head, that's OK. I'm still curious.
The further a galaxy is from us, the more distant back in time its light was sent. So those near the visible horizon of our universe that are truly hauling *** were hauling *** away from us 10 billion years ago. What about today? Couldn't a distant galaxy's relative velocity be a function of time rather than distance? How do cosmologists decouple these factors to arrive at the correct result (that our universe's expansion is accelerating)?
Thanks for any insight you can provide! :)