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Dark matter constitutes ________ of the mass in galaxy clusters, while the majority of non-dark matter mass is found in ________.
Q2: Something that is _ is oriented or
Q29: A crowded reception room means that the
Q31: Which of the following types of calls
Q44: The phenomenon pictured in the figure below
Q46: Astronomers expect life to be rare (and
Q54: Which is the most common type of
Q55: You observe a reddish galaxy with stars
Q73: As our Sun ages, it slowly gets
Q75: How old is Earth? What was the
Q83: How did the presence of cyanobacteria on