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Originally Posted by ExpErdMann
That seems like an unsupported statement to me. I wonder how one would apply a timescale to something like a cooling white dwarf.
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You could look at a fresh white dwarf and see how much energy it is radiating, and then look at older ones and see what they are radiating. You know the temperatures of the objects by the spectrum they give off. You can calculate how rapidly they are cooling.
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Originally Posted by ExpErdMann
I mentioned in my first post that gravitational potential energy in stars has to be regenerated. While it is only speculation at this stage, I suppose that this energy is drawn from the energy lost by photons due to the cosmic redshift.
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I don't know what you mean by "gravitational potential energy in stars has to be regenerated". Can you elaborate on any mechanism by which energy lost to tiring photons could "regenerate gravitational potential in stars"? At the moment I'm not seeing what you mean here.