The distance to the globular cluster M55 has been determined to be 6500 pc by analysis of RR Lyrae stars in the cluster. How do the apparent brightnesses of these stars compare with the apparent brightness of the Sun? (Calculate b/bŸe)
A) 5.9 × 10-17
B) 2.5 × 10-7
C) 2.4 × 10-6
D) There is no reason to believe all RR Lyrae stars in M55 have the same apparent brightness.
Correct Answer:
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