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A Cepheid Variable Is Observed in a Distant Galaxy

Question 27

Multiple Choice

A Cepheid variable is observed in a distant galaxy. Its period is 30 days, and its apparent magnitude of 19.8 corresponds to a brightness ratio of b/bŸ = 2.35 x 10-19. How far away is it?


A) 1 kpc
B) 180 kpc
C) 1 Mpc
D) 13.6 Mpc

Correct Answer:

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