Yes it does!

The only exacting proof that the cosmic redshift is caused by relativistic expansion is the time-dilation measured in supernova light-curves. The theory redshifting is caused by relativistic expansion is completely dependent upon the theory that type Ia supernova events are caused by a white dwarf star accreting matter to a critical mass and exploding within a narrow range of light-curve widths and ~0.6 absolute magnitudes.

We know that gamma rays that we observe at cosmic distances are more powerful than the few that we have observed locally. Using current theories and methods for reducing the data, the most distant supernova events are interpreted as being 1-3 magnitudes dimmer than the brightest of the local supernova events. It is the theory that these type Ia explosions fall within a fairly narrow range of magnitudes that drives this conclusion.

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jwj

It's a big universe out there...is it really unwinding, really burning out?