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Presumably they mean propagating EM radiation we observe from earth appears to behave the same on earth as we observe from distant galaxies since the event that
by fnordpiglet 2y ago
Presumably they mean propagating EM radiation we observe from earth appears to behave the same on earth as we observe from distant galaxies since the event that created them happened at a time much different than ours and a distant region of space.
- saalweachter 2y agoI mean, technically the EM radiation we observe from distant galaxies does look different than the EM radiation we observe locally: it's red-shifted. I'm sure someone has proposed this is due to physical constants changing over time, rather than the expansion of space-time, and I'm sure someone else has explained why this is wrong.