Yes ... keep reading that explaination

Quote:

Special Relativity predicts a Doppler redshift ...

On the other hand, General Relativity predicts a gravitational blueshift of ....

Rebka countered the gravitational blueshift by moving the emittor away from the receiver, thus generating a relativistic Doppler redshift:

The detector at the bottom sees a superposition of the two effects ....


That was the original problem if the universe wasn't expanding we would expect to see red shifts, blue shifts and nuetral galaxies which we don't .. we see only red.

I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.