This incredible snapshot shows narrow filaments, including Sh2-308, a weak gas envelope that is 5,200 light-years distant and located in the territory of the Great Dog constellation. This large, bubble-like structure bends around an extremely bright and large Wolf-Rayet star type - EZ Big Dog. These are the brightest and largest stars in the Universe (10 times larger than the Sun), representing the last evolutionary stage.
Strong winds stood out from the progenitors, filling the neighborhood and exhausting the outer layers of this type of stars. The wind picks up the surrounding material and creates gas bubbles. EZ Big Dog is responsible for the formation of the Sh2-308 bubble (discarded the outer layers to create these visible threads). The star constantly produces intense radiation, which causes the bubble to expand. Now its edges reach 60 light years! Despite all its beauty, this is a temporary phenomenon. The star that created the bubble will lead him to death in a supernova explosion.
