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Q1: Emission nebulae like M42 occur only near
Q9: Why do astronomers speak in terms of
Q26: Star clusters have been observed within dark
Q36: Synchrotron radiation found with active nuclei implies
Q53: In pair production in the Big Bang,which
Q56: In the formation of our Galaxy,the _
Q63: All pulsars are neutron stars; why is
Q84: When mass is accreted into a black
Q85: The densely packed neutrons of a neutron
Q95: At decoupling,the electrons and protons were made