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Q12: Which of the following statements about apparent
Q40: GUT theories predict that protons will eventually
Q48: Which of the following statements about a
Q54: Clouds that appear dark in visible light
Q54: Which group represents stars that are extremely
Q67: Which of the following is not consistent
Q72: The idea of dark matter arose to
Q86: Which of the following features is not
Q91: Which group represents stars that have no
Q98: Which of the following statements is not