This is the answer I’ve been looking for after years of having this concept explained only with vague references to expanding balloons, or allusions to the expansion of space being some sort of intrinsic property. Thank you! This quagmire of a concept reminds me a lot of the confusion around ”relativistic mass”, which has thankfully fallen out of usage.
A follow up question to this, does this mean there is some unique Center Of Momentum frame, or is this precluded by SR? And how is this related to the CMBR rest frame?
Resaren t1_jam94cw wrote
Reply to comment by Aseyhe in Why do cosmologists say that gravity should "slow down" the expansion of the universe? by crazunggoy47
This is the answer I’ve been looking for after years of having this concept explained only with vague references to expanding balloons, or allusions to the expansion of space being some sort of intrinsic property. Thank you! This quagmire of a concept reminds me a lot of the confusion around ”relativistic mass”, which has thankfully fallen out of usage.
A follow up question to this, does this mean there is some unique Center Of Momentum frame, or is this precluded by SR? And how is this related to the CMBR rest frame?