Final answer:
The glowing regions caused by the collision of high-speed particles from a protostar with nearby gas are known as Herbig-Haro (HH) objects.
Step-by-step explanation:
On occasion, the jets of high-speed particles streaming away from the protostar collide with a somewhat-denser lump of gas nearby, excite its atoms, and cause them to emit light. These glowing regions are known as Herbig-Haro (HH) objects after the two astronomers who first identified them. These objects allow us to trace the progress of the jet to a distance of a light-year or more from the star that produced it. Herbig-Haro objects are significant because they provide visible evidence of the dynamic processes occurring as a protostar evolves, particularly involving jets of particles that collide with surrounding gas, leading to a celestial spectacle.