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A comment on Gigantic jet spied from black hole in early universe.

Re:Gigantic jet spied from black hole in early universe by hasa on Friday March 12, 2021 @05:01AM (#26433962)
How can the jet length to be determined? In my very limited understanding jet is a continuous stream of particles/radiation. Doesn't it continue forever, unless the flow hits some barrier?
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Re:Gigantic jet spied from black hole in early universe by joemag on Friday March 12, 2021 @05:06AM (#26433984)
It gets diffused to the point where it’s no longer distinguishable from the background.
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Re:Gigantic jet spied from black hole in early universe by est31 on Friday March 12, 2021 @05:38AM (#26434251)
I guess it's similar to determining where the sun's atmosphere ends and the solar system begins, or where earth's atmosphere ends. You have to draw a line somewhere.
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Re:Gigantic jet spied from black hole in early universe by Keysh on Friday March 12, 2021 @12:16PM (#26438089)
If the jet only turned on a finite time ago, then it will only have gotten so far in that time, so it will have a length = (jet velocity) * (time jet has been active).
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