Multiple Choice
A classical Cepheid variable star in a distant galaxy has an apparent magnitude of +20.3. By measuring its period and using the period-luminosity relation, its absolute magnitude is -6.0. Assuming that there is no interstellar absorption, what is the distance to the galaxy in parsecs?
A) 3.6 * 104 pc
B) 7.2 * 103 pc
C) 1.1 * 105 pc
D) 1.8 * 106 pc
Correct Answer:
Verified
Correct Answer:
Verified
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