Continuing the discussion from Is Cosmic Expansion the Best Fit Model?:
Somehow I think there are in fact cosmic standards for these things. Aren’t there @physicists?
Continuing the discussion from Is Cosmic Expansion the Best Fit Model?:
Somehow I think there are in fact cosmic standards for these things. Aren’t there @physicists?
I am not sure what @nwrickert meant by “standards” of time or distance. Whether these really exist or not depends on what is meant by these “standards”:
Can we rule out the possibility that the cosmos is a homeostatic system with a local appearance of aging and expansion?
I have not come across a model that fits all the evidence the way the expanding cosmos does. This does not mean that such a model does not exist, but I suspect it to have to be very concocted or ad-hoc.
Edit:
As an example, the model that @Dan_Eastwood jested about on the other thread:
WHAT IF it’s not expansion … trying to wrap my head around this one … if the universe is not expanding, then the frequency of light is slowing down over time …
Has been proposed before, and failed the Tolman Surface Brightness test.