When galaxies collide, the large- scale galactic structure is affected, but most of the individual stars are not.
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Q11: Head- tail radio galaxies reveal their motion
Q12: For nearby galaxies, determining the rotation curve
Q13: Galactic collisions mostly involve interactions between gas
Q14: Most of the matter in the universe
Q15: There are large amounts of superhot intergalactic
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
Q21: The rapid decline in quasars 10 billion
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