Hank explains how quasars and blazars are both the same thing – just oriented differently in respect to us – and how that impacts the way we perceive them and how it also effects the ways we can study them.
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References
http://imagine.gsfc.nasa.gov/docs/science/know_l1/active_galaxies.html
http://www.nrao.edu/pr/2005/fastblazars/index-p.shtml
http://www.sciencemag.org/content/292/5524/1985.1.summary
