Originally Posted By: Bill
I haven't seen anything about that discussion, but an extremely massive galaxy would show a gravitational red shift. Actually any size galaxy would have one, but normally it would be so small it would be indetectible.

Bill Gill

Yes, I can see that. It's very surprising to me that such small gravitational redshifts can be confidently differentiated from redshift due to recessional velocity.

I should think it involves redshift measurement of Cepheid variables and Type 1a supernovae, but there's still the problem of differentiating the causes of the shift.

If anyone knows of a source of further relevant info, I'd be glad of it.
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"Time is what prevents everything from happening at once" - John Wheeler