RCW 79 is a bubble of hydrogen and dust spanning an estimated 70 light years and is thought to be around 2 million years old.
The nebula is ionized by a star which is either a late O class star or a a Wolf-Rayet star.
Imaged in Ha OIII and RGB for star color on my Planewave CDK 700 at Observatorio El Sauce, Chile.
Image acquisition and processing: Mike Selby