Oct 11
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A minority of quasars show strong radio emission, which originates from jets of matter moving close to the speed of light. When looked at down the jet, these appear as a blazar and often have regions that appear to move away from the center faster than the speed of light (superluminal expansion.) This is an optical trick due to the properties of special relativity. (via Modern Physics and Astronomy: QUASAR)

A minority of quasars show strong radio emission, which originates from jets of matter moving close to the speed of light. When looked at down the jet, these appear as a blazar and often have regions that appear to move away from the center faster than the speed of light (superluminal expansion.) This is an optical trick due to the properties of special relativity. (via Modern Physics and Astronomy: QUASAR)

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