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1

Using a value for Hubble's constant of 70 km/s per Mpc, find the distance of a galaxy that is receding at a velocity of 1600 km/s.
2

Using a value for Hubble's constant of 70 km/s per Mpc, find the recession velocity of a galaxy at a distance of 40 Mpc.
3

At 2 pc from the center of the Andromeda Galaxy, gas revolves at 100 km/s. Use Kepler's third law (Equation 22.2) to find the mass within the central 2 pc of the Andromeda Galaxy.





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