NGC 1929, a cosmic superbubble.

NGC 1929, a nebula in the Large Magellanic Cloud. Officially known as N44. Hot young stars are emitting intense ultraviolet light, causing the gas to glow. This effect highlights a cosmic superbubble, a vast shell of material around 325 bay 250 light years across.
This superbubble has been produced by the combination of two processes. Firstly, stellar winds — streams of charged particles from the very hot and massive stars in the central cluster — cleared out the central region. Then massive cluster stars exploded as supernovae creating shockwaves and pushing the gas out further to form the glowing bubble.