"As light travels towards us from the distant galaxies, it is stretched over time by the ever expanding space it is travelling through. The longer it travels, the more the wavelengths are increased (reddened)."
https://www.wwu.edu/astro101/a101_hubble_redshift.shtml
At the same time Einsteinians teach that space inside galaxies and galactic clusters does not expand at all (they reject the scenario in which expansion does occur but is overcome by gravitational attraction):
"Is the space inside, say, a galaxy growing but overcome by the gravitational attraction between the stars? The answer is no. Space within any gravitationally bound system is unaffected by the surrounding expansion."
View: https://youtu.be/bUHZ2k9DYHY?t=356
Sabine Hossenfelder: "The solution of general relativity that describes the expanding universe is a solution on average; it is good only on very large distances. But the solutions that describe galaxies are different - and just don't expand. It's not that galaxies expand unnoticeably, they just don't. The full solution, then, is both stitched together: Expanding space between non-expanding galaxies...It is only somewhere beyond the scales of galaxy clusters that expansion takes over."
https://www.forbes.com/sites/starts...ont-actually-expand-in-an-expanding-universe/
So light is stretched as it travels in the space between galactic clusters, then stretching stops as the light enters a cluster, then stretching continues as the light leaves the cluster, etc.
The statement that light is stretched by space expansion, just like Big Brother's 2+2=5, is so preposterous that no rational criticism is possible. The reaction can only be hysterical ("But this is idiotic, don't you see?") and then the critic becomes crank, crackpot, troll, etc.
George Orwell: "In the end the Party would announce that two and two made five, and you would have to believe it. It was inevitable that they should make that claim sooner or later: the logic of their position demanded it. Not merely the validity of experience, but the very existence of external reality, was tacitly denied by their philosophy. The heresy of heresies was common sense. And what was terrifying was not that they would kill you for thinking otherwise, but that they might be right. For, after all, how do we know that two and two make four? Or that the force of gravity works? Or that the past is unchangeable? If both the past and the external world exist only in the mind, and if the mind itself is controllable what then?"