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Quasars and Other Active Galaxies

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"I can't believe that," said Alice.

"Can't you?" the Queen said in a pitying tone. "Try again: draw a long breath and shut your eyes."

Alice laughed. "There's no use trying," she said, "one can't believe impossible things."

"I daresay you haven't had much practice," said the Queen. "When I was your age, I always did it for half-an-hour a day. Why, sometimes I've believed as many as six impossible things before breakfast."

Lewis Carroll

Questions to Explore:
  • What is the significance of the large redshifts of quasars?
  • Why are quasars so luminous yet so small?
  • Why do the components of some quasars seem to be moving apart faster than the speed of light?
  • How are the different kinds of quasarlike objects related to each other?
  • What is the nature of the jets of matter that flow out of the cores of active galaxies?
  • Why are quasars found only at great distances from us?
  • What effect can a gravitational lens have on the appearance of a quasar?

AstronomyOnline Learning Center

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