Herbig-Haro objects are small patches of nebulosity associated with newly-born stars, and are formed when gas ejected by young stars collides with clouds of gas and dust nearby at speeds of several hundred kilometres per second. Herbig-Haro objects are ubiquitous in star-forming regions, and several are often seen around a single star, aligned along its rotational axis.
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A 'knotty' region of the interstellar medium which is emitting electromagnetic radiation because it is being excited by a jet from the bipolar outflow of a protostar .
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