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A distant galaxy was found to have a redshift of 1.8. How far away is the galaxy? Express you
answer in Mpc units. You can assume that the galaxy has zero peculiar velocity and that the
Hubble constant is 70 km/s/Mpc.
Solution
the distance is calculated as follows:
z = HD
D = z/H
= 1.8 km/s / 70 km/s/Mpc.
= 0.0257 Mpc

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A distant galaxy was found to have a redshift of 1.8. How far away i.pdf

  • 1. A distant galaxy was found to have a redshift of 1.8. How far away is the galaxy? Express you answer in Mpc units. You can assume that the galaxy has zero peculiar velocity and that the Hubble constant is 70 km/s/Mpc. Solution the distance is calculated as follows: z = HD D = z/H = 1.8 km/s / 70 km/s/Mpc. = 0.0257 Mpc