The rapid decline in quasars 10 billion years ago signifies a rapid decline in galactic mergers.
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Q16: When galaxies collide, the large- scale galactic
Q17: The stability of clusters of galaxies suggests
Q18: The percentage of dark matter in galactic
Q19: Galactic collisions are believed to be commonplace.
Q20: The largest known galaxies contain about 10
Q22: No binary black hole has ever been
Q23: Virgo A (M87) is probably a dead
Q24: Hubble reveals the most distant (first) galaxies
Q25: The brightest active galaxies are giant ellipticals.
Q26: Astronomers have discovered two black holes in
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