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Q4: What is the approximate age of the
Q13: What is the fate of an open
Q19: An E galaxy contains<br>A) mostly lower-main sequence
Q25: Which of the following is not considered
Q34: The dust in the interstellar medium can
Q37: A gas in which the pressure no
Q44: The flash spectrum shows that temperature falls
Q46: The pressure of a gas depends on
Q52: Which of the following is not an
Q74: Which star in Diagram 9-1 has the