PSO J172.3556+18.7734 is an astrophysical jet that was discovered in May 2011.
It was originally thought to be a quasar by astronomers; as of March 8, 2021, it is now classified as a cosmic jet (astrophysical jet).
[1][2] As of 2021[update], it is the farthest jet discovered with a redshift of 6.82.
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