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A bipolar outflow represents two continuous flows of gas from the poles of a star. Bipolar outflows may be associated with protostars, or with evolved post-AGB stars.

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Herbig–Haro objects are small patches of nebulosity associated with newly born stars, and are formed when narrow jets of gas ejected by those stars collide with nearby clouds of gas and dust at speeds of several hundred kilometres per second.

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Bok globules are isolated and relatively small dark nebulae, containing dense cosmic dust and gas from which star formation may take place.

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are a class of variable stars named after their prototype – T Tauri.

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is an interstellar cloud of dust, hydrogen, helium and other ionized gases.