Messier 87 - Wikipedia, the free encyclopedia:
"The relativistic jet of matter emerging from the core extends at least 1.5 kpc (5 kly) from the nucleus of Messier 87 and is made up of matter ejected from the galaxy by a supermassive black hole. This jet is highly collimated, appearing constrained to an angle of about 16° within 2 pc (6.5 ly) of the core and an angle of 6–7° at a distance of 12 pc (39 ly). It is surrounded by a lower velocity, non-relativistic component. There is evidence of a counter jet, but this feature remains unseen from the Earth due to relativistic beaming.[60][61] The jet is precessing, causing the outflow to form a helical pattern out to a distance of 1.6 pc (5.2 ly).[47] Lobes of matter from the jet extend out to a distance of 77 kpc (250 kly).[62]"
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