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C. M. Urry (STScI)
Massive outflows are common in stars and Active Galactic Nuclei, either as diffuse winds or well-collimated jets. Galactic and extragalactic jets associated with black holes are often relativistic, at least initially, and probably originate very near the black hole. Blazars are a useful laboratory for studying relativistic jets in AGN because of their orientation along the line of sight, which enhances the observed jet emission by several orders of magnitude. Multiwavelength spectroscopic and imaging studies of blazars and radio galaxies, at radio through gamma-ray energies, have provided many clues about the nature of AGN jets. I review the key observations and describe our current understanding of their emission mechanisms, structures, kinematics, and energetics.
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