## Intro to using Hubble's Law

### Using Hubble's Law to solve for M31's velocity

_{o}x d

where v is the recessional velocity of the galaxy, d is its distance away,
and H_{o} is a constant. If you know the distance to M31 and the
value of H_{o} (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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