The Science Asylum explains the Tolman test for an expanding universe although in the comment section he wonders why if this is an established fact why is it not discussed more?
https://www.youtube.com/watch?v=nSJtzn2H3Do I guess he is not aware that the evidence for this "fact" has always been poor and it has become worse with the latest data from the James Webb space telescope as this paper argues. So the reason no one talks about it is because it undermines big bang cosmology. Cosmological Model Tests with JWST https://www.mdpi.com/2075-4434/10/6/108?fbclid=IwAR1hmgJ7e3_NjG0gvLPfakBNUXXKfQT7WyCxxZfNQAUVkJ_u3W5PFO0sibM Harry
