A 5000 light year long jet observable in optical light from the giant elliptical galaxy M87 - which is not technically a blazar, because its jet isn't aligned with the Earth. Credit: ESA/Hubble.
Polar jets are often found around objects with spinning accretion disks ? anything from newly forming stars to ageing neutron stars. And some of the most powerful polar jets arise from accretion disks around black holes, be they of stellar or supermassive size. In the latter case, jets emerging from active galaxies such as quasars, with their jets roughly orientated towards Earth, are called blazars.
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Read the rest of Astronomy Without A Telescope – Blazar Jets (585 words)
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Full story at http://www.universetoday.com/76443/astronomy-without-a-telescope-blazar-jets/
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