Herbig-Haro (HH) objects are small, bright patches of nebulosity associated with star-forming regions. They are created by the interaction of stellar jets ejected from young, newly formed stars with the surrounding interstellar medium. The jets typically have high velocities and can collide with the gas and dust surrounding the forming star, causing these bright knots of emission. Herbig-Haro objects were first identified by astronomers George Herbig and Guillermo Haro in the 1940s.
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