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Suppose a Spiral Galaxy Is a Million Parsecs Away So

Question 15

Multiple Choice

Suppose a spiral galaxy is a million parsecs away so that its distance modulus is 25. What would be the approximate luminosity of an RR Lyrae variable star in this galaxy?


A) 25 LSun
B) 100 LSun
C) 2500 LSun
D) The luminosity cannot be determined from this information alone.

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