"No experiment has ever been performed that verifies that expanding space can indeed alter the wavelength of an already moving photon."
View: https://youtu.be/94_3N7XZjBQ?t=349
This can be generalized:
No length or distance between two entities has ever been observed to change as a result of space expansion.
Expanding space keeping lengths and distances unchanged? Oxymoron?
This can be generalized:
No length or distance between two entities has ever been observed to change as a result of space expansion.
Expanding space keeping lengths and distances unchanged? Oxymoron?