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What is a jet in astronomy?

a gamma ray burst

supernova explosion

hyper-velocity object

collimated plasma stream

An astrophysical jet is an astronomical phenomenon where outflows of ionised matter are emitted as an extended beam along the axis of rotation. When this greatly accelerated matter in the beam approaches the speed of light, astrophysical jets become relativistic jets as they show effects from special relativity.

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NASA Goddard Space Flight Center wikipedia → Astrophysical jet

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