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Redshift Measurements on a Galaxy Show That It Is Receding

Question 43

Multiple Choice

Redshift measurements on a galaxy show that it is receding from us with a velocity of 7240 km/s. Estimate how far away the galaxy is if the Hubble constant is 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)


A) 3.1 × 1024 m
B) 1.2 × 1026 m
C) 1.2 × 1024 m
D) 4.1 × 1023 m
E) 2.0 × 1022 m

Correct Answer:

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