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Q12: Which of the following statements about the
Q13: What is the cause of its many
Q19: In a planetary nebula, the shell of
Q24: If you wanted to discover the youngest
Q26: The scientist who first proposed that comet
Q26: How do astronomers now explain the fact
Q28: Which of the following statements about forces
Q29: The four large moons of Jupiter were
Q30: Which of the following statements about the
Q36: When astronomers do radar astronomy, they<br>A) look