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A_A , 3 hours ago (edited 3 hours ago) There are three proper distances worth keeping straight in one’s mind: Today’s (comoving) distance, the distance when the light set out, and the distance the light itself traveled. image lifeng.lamost.org/…/t16_three_distancesB.html
There are three proper distances worth keeping straight in one’s mind: Today’s (comoving) distance, the distance when the light set out, and the distance the light itself traveled. image
lifeng.lamost.org/…/t16_three_distancesB.html