HST image of a bipolar outflow at optical wavelengths. The two blobs of emission are the Herbig–Haro objects 1 and 2. The visible emission originates in shock-excited gas interacting with a hidden high-velocity bipolar wind generated by an invisible class I protostar located in the dark cloud core between the two lobes.
Ref: E NCYCLOPEDIA OF ASTRONOMY AND ASTROPHYSICS.pdf
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