Intro to using Hubble's Law
Using Hubble's Law to solve for M31's velocity
where v is the recessional velocity of the galaxy, d is its distance away, and Ho is a constant. If you know the distance to M31 and the value of Ho (Hubble's constant), this relationship should give you its velocity relative to Earth, allowing you to solve the challenge question and be free of quizzes for an entire semester!
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