A bright nebular patch formed when jets of gas from a newborn star collide with surrounding interstellar material at high speeds. These objects appear as glowing knots and streamers of gas, often changing brightness over periods of years.
Named after American astronomers George Herbig and Mexican astronomer Guillermo Haro, who independently discovered and studied these objects in the 1940s-1950s. The term combines their surnames to honor their parallel research into these stellar nursery phenomena.
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