The Popped Balloon Nebula

The Popped Balloon Nebula is a supernova remnant, and lies in the constellation of Cassiopeia. It is designated as LBN576 and Abell 85 , and also popularly referred to as the Garlic Bulb Nebula and Medulla Nebula. 

This image was captured targeting light in the wavelengths of Hydrogen (Ha) and Oxygen (OIII), which were then combined in processing.

https://astrob.in/9himnp/0/