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If the stars at the turnoff point of a cluster have a mass of 3 times the mass of the Sun,what is the age of the cluster?
Q10: Refer to the figure.Why is it more
Q19: Which of the following is believed to
Q29: When we see a binary system producing
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Q49: What is the explanation for the pattern
Q59: What statement below best describes the refraction
Q70: What feature of a telescope is a
Q73: When does a type-II supernova occur?<br>A)when a
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Q113: As the Moon covers the solar disk