The Bubble Nebula (NGC 7635)
This is the Bubble Nebula (NGC 7635) and the bubble is a result of stellar off gassing interacting with the stellar wind and emission nebula surrounding it.
https://en.wikipedia.org/wiki/NGC_7635
This was shot in narrowband and it sums up to 19.5 hrs of data between the Ha, Oiii, and Sii filters and a HOO variant can be seen below.
Close up Hubble image of the Bubble’s structures.
Image Credit: Hubble, NASA, ESA
Technical
Explore Scientific 127 FCD100 APO telescope
MoonLite focuser
SkyWatcher EQ6-R Pro mount
ZWO ASI1600 MM Pro camera
Chroma Ha, Oiii, and Sii filters