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Using Hubble's Law to solve for M31's velocity
Hubble's Law is a relationship between the radial velocities of distant
galaxies and their distances away from us. The relationship can be
stated:
v = Ho x d
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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