I remember watching this PBS Spacetime video on this: https://www.youtube.com/watch?v=SXg6YVcdOcA

I wonder how one would test this. I suppose you could look for stars that seem to be older than the universe, in places that are significantly less densely populated with matter?

If this theory is true and seems plausible, wouldn't that make any previous calculations to very distant objects invalid?

ie. "standard candles" are no longer consistent?

adding link to actual paper:

https://academic.oup.com/mnrasl/article/537/1/L55/7926647