Astronomy question
Paper instructions:
A type 1 Cepheid variable star has a period of 20 days and an apparent magnitude of +20. What is the distance to the galaxy in which this star is found?
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Astronomy question
Paper instructions:
A type 1 Cepheid variable star has a period of 20 days and an apparent magnitude of +20. What is the distance to the galaxy in which this star is found?