Multiple Choice
A Cepheid variable star with a pulsation period of a few days is seen in the spiral arm of a galaxy. Its apparent brightness is measured as 104 times fainter than an equivalent star 1000 ly away from the Sun in the Milky Way Galaxy. Assuming no light absorption between galaxies, how far away is the more distant Cepheid?
A) 107 ly (104 times farther away)
B) 10,000 ly (10 times farther away)
C) 10 ly (100 times closer)
D) 100,000 ly (100 times farther away)
Correct Answer:
Verified
Correct Answer:
Verified
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