Discussion on question by Ask Questions: How do we know the expansion of space is happening "now" and isn't an illusion?
Discussion on question by Ask Questio…
Imported from a comment discussion on https://astronomy.stackexchange.com/questions/58744/how-do-we-know-the-expansion-of-space-is-happening-now-and-isnt-an-illusion
121d ago – Ask Questions
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