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Is the observed stretching of the SNIa lightcurves, ie the delaying of the emitted photons at reception, evidence that space is expanding or should this be explained otherwise and how?

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  • $\begingroup$ Could you link to the observations you mention? $\endgroup$ – Dale Mar 24 at 22:24
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There is no yes/no answer to this. The equations used in general relativity to describe this do not clearly map onto English statements like "space is expanding" or "space is not expanding."

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