Multiple Choice
Why are Cepheid variables so important for measuring distances in astronomy?
A) They all have the same luminosity.
B) They all have the same period.
C) Their luminosity can be inferred from their period.
D) They are close enough to have a detectable parallax.
E) They are circumpolar like Polaris,the North Star.
Correct Answer:
Verified
Correct Answer:
Verified
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