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Q1: What is the ratio of the light-gathering
Q15: What is an extrasolar planet?<br>A) a planet
Q27: Which of the following are spiral galaxies
Q29: What happens in the carbon-nitrogen-oxygen (CNO) cycle?<br>A)
Q49: The nucleus of the hydrogen atom consists
Q64: The redshifts of the galaxies imply that
Q66: An object of known brightness that astronomers
Q77: Suppose you want to know the distance
Q79: Why does each element have its own
Q96: The _ of the Sun is composed