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Active Galaxies

• How do active galaxies different from normal ones?
• What is most of the radiation from a normal galaxy like?
• What are the main types of active galaxies?
• What does a Seyfert galaxy look like?
• What does a radio galaxy look like?
• What is ultimately responsible for energy emission in an active galaxy?
• How massive are the black holes in the cores of galaxies?
• Why are active galaxies much brighter than normal ones?
• In what form does the energy from an active galaxy reach us?

Quasars

• What are quasars?
• Why are quasars called that way?
• How far are quasars from us?
• What is so special about quasars?
• How much energy do quasars emit, compared to the Milky Way?
• To distinguish a quasar from an ordinary star, what would you check first?
• What property of a quasar gives us a limit on its size?
• Why don't we see any quasars nearby?
• What do we believe is the eventual fate of quasars?
• What can we conclude if we see two images of the same quasar?
• How do gravitational lenses work?
• Why are gravitational lenses useful?