- #1
Martyn Arthur
- 128
- 25
- TL;DR
- The Expansion of Space Overall Beyond the Visible Universe
I first apologize if this has been posted more than once; sorry.
There is a lack of clarity at my end as to whether I am logged on here?
Say we have two galaxies, the Milky Way (MW) and galaxy A separated along a straight line 20 x the radius of the Universe visible to us.
If I understand correctly then the rate of the physical expansion of space between MW and A could be at the rate of say,
Hi, may I ask a question, please?
Say we have two galaxies, the Milky Way (MW) and galaxy A separated along a straight line 20 x the radius of the Universe visible to us.
The MW is considered a stationary observer.
Then disregarding for the purpose of this any other objects or influences.
If I understand correctly then the rate of the physical expansion of space between MW and A could be at the rate of say, arbitrarily, 10 x c.
I understand that those two galaxies aren't moving through space, the entirety of space between them is physically expanding.
If we then have galaxy D positioned along the same line, just at the edge of our visible Universe which we observe being redshifted relative to the MW at the rate of 1 x c.
Then I understand that the entirety of space between MW and A is expanding at the [arbitrary] rate of 10 x c.
So that the "elastic band" comprising the space between MW and A must presumably be carrying everything within it at the same rate.
So then why then is it that galaxy D is not seen as being redshifted / transported within that "elastic band" away from the MW at 1/2 x 10 x c?
Thinking from another perspective.
If there are two galaxies separated for now along a straight line 200 x the radius of the Universe visible to us.
Is the space between those galaxies expanding at a "commensurate" rate?
If the Universe is infinite does that lad to a concept that the rate of expansion is infinite?
Thanks
Martyn
There is a lack of clarity at my end as to whether I am logged on here?
Say we have two galaxies, the Milky Way (MW) and galaxy A separated along a straight line 20 x the radius of the Universe visible to us.
If I understand correctly then the rate of the physical expansion of space between MW and A could be at the rate of say,
Hi, may I ask a question, please?
Say we have two galaxies, the Milky Way (MW) and galaxy A separated along a straight line 20 x the radius of the Universe visible to us.
The MW is considered a stationary observer.
Then disregarding for the purpose of this any other objects or influences.
If I understand correctly then the rate of the physical expansion of space between MW and A could be at the rate of say, arbitrarily, 10 x c.
I understand that those two galaxies aren't moving through space, the entirety of space between them is physically expanding.
If we then have galaxy D positioned along the same line, just at the edge of our visible Universe which we observe being redshifted relative to the MW at the rate of 1 x c.
Then I understand that the entirety of space between MW and A is expanding at the [arbitrary] rate of 10 x c.
So that the "elastic band" comprising the space between MW and A must presumably be carrying everything within it at the same rate.
So then why then is it that galaxy D is not seen as being redshifted / transported within that "elastic band" away from the MW at 1/2 x 10 x c?
Thinking from another perspective.
If there are two galaxies separated for now along a straight line 200 x the radius of the Universe visible to us.
Is the space between those galaxies expanding at a "commensurate" rate?
If the Universe is infinite does that lad to a concept that the rate of expansion is infinite?
Thanks
Martyn