What visible astronomical objects provide direct evidence of powerful jets being ejected from a forming stellar system's poles?

Answer

Herbig-Haro objects

The powerful, collimated jets ejected perpendicular to the accretion disk shock the surrounding gas, and the resulting visible knots of shocked material are observed as Herbig-Haro objects.

What visible astronomical objects provide direct evidence of powerful jets being ejected from a forming stellar system's poles?

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