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Strahlen verlassen einen Himmelskörper, so wie Sonnenstrahlen die Sonne verlassen: Isaac Newton konnte bereits bestimmen, dass die Reisedauer von Licht von der Sonne zur Erde zwischen 7 bis 8 Minuten liegt.

Blazars are categorized differently than other active black holes with jets because they have unique properties when viewed by telescopes. They give off a full range of light, dominated by high-energy gamma rays. As particles in the jets are accelerated to almost the speed of light, they give off a specific infrared signature, which NASA's Wide-field Infrared Survey Explorer (WISE) can detect. Astronomers have taken advantage of this fact, and used the WISE all-sky catalog to uncover more than 200 new blazars so far.

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