1. If a galaxy has an apparent radial velocity of 2000 km/s and the Hubble constant is 70… 1 answer below »

1. If a galaxy has an apparent radial velocity of 2000 km/s and the Hubble constant is 70 km/s/Mpc, how far away is the galaxy? (Hint: Use the Hubble law.) 2. Suppose you found a galaxy in which the outer stars have orbital velocities of 150 km/s. If the radius of the galaxy is 4 kpc, what is the orbital period of the outer stars? (Note: 1 pc 5 3.08 × 1013 km, and 1 yr = 3.16 × 107 seconds.)  

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