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What makes up the majority of the mass of an individual spiral galaxy?
Q23: Compared with what we see today, galaxies
Q28: The figure below uses a rubber sheet
Q35: Which of the layers of the Sun
Q43: Describe two different experiments that offer evidence
Q44: What types of fusion are occurring in
Q55: You observe a reddish galaxy with stars
Q60: The most common type of galaxy found
Q75: Active star formation does not typically occur
Q90: The CMB is a snapshot of the
Q91: In a white dwarf, what is the