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:
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Q18: What are the standard units for apparent
Q19: What are the standard units for luminosity?
A)watts
B)joules
C)Newtons
D)kilograms
E)watts
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Q25: On the main sequence,stars obtain their energy
A)from
Q26: On a Hertzsprung-Russell diagram,where would we find
Q27: Which of the following is true about
Q28: Which of the following characteristics of stars
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