While yet unseen, some gravitational evidence suggests the existence of dark galaxies.
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Q3: Collisions between galaxies have little effect on
Q4: The Lyman-alpha "forest" are absorption lines in
Q5: Galaxies contain at most one supermassive black
Q6: On average, the stars in elliptical galaxies
Q7: When observing a very distant quasar, we
Q9: Giant irregulars are the most massive of
Q10: The last quasar probably died out a
Q11: Distant galaxies tend to be much bluer
Q12: On average, elliptical galaxies are much older
Q13: Galaxies in clusters are much more likely
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