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A comment on Test can show if the speed of light has changed.

Re:Test can show if the speed of light has changed by wcoenen on Monday November 28, 2016 @09:11AM (#13055473)
1 meter is defined as the distance travelled by light in 1 / 299,792,458 seconds. Doesn't this mean that "light slowing down" would be indistinguishable from "space expanding"?
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