What is the significance of an $H_0$ value of $70 ext{ km/s/Mpc}$?
Answer
For every additional megaparsec a galaxy is from Earth, its recession speed increases by $70$ kilometers per second.
A value of $H_0 = 70 ext{ km/s/Mpc}$ means that the recessional velocity increases by $70$ kilometers per second for every additional megaparsec of distance separating the galaxy and Earth.
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