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A bipolar outflow is material flowing from an object in opposing directions. Jets, e.g., from YSOs or active galactic nuclei (AGNs), generally form along their axis of rotation, sometimes forming in both directions simultaneously, i.e., bipolar jets. Such jets can produce a glow from shock heat, when the flowing material strikes the surrounding cloud or interstellar medium. The glow can be the brightest aspect of some stages of star formation, thus is considered an important means of locating and observing protostars. The jets of AGNs can produce the observable pairs of lobes of some radio galaxies.