This incredible sight is a supernova remnant, that is the left over gas from a star that's ended it's life in a huge explosion. The overlapping Ha (red) and O3 (blue) shells show the shock wave expanding through space, like ripples on a pond this will expand for ever getting weaker and weaker until it's no longer visible and gone forever.
It's believed that the star exploded around 40 thousand years ago and is around 3 thousand light years away from us.
This structure is truly massive, if you could see this with your eyes it would have the apparent width of 6 full moons in the night sky, which is mind blowing to consider.
A huge challenge technically in collection and especially in processing, a total of 48 hours at least in terms of integration and then time spent processing represents my largest project to date.
This image is not a pano, that is true, that being said it is a mosaic, it's connected top and bottom rather right and left edges of a landscape image and given the effort given and the result obtained I think this belongs in this collection.
Kit
ZWO ASI294MM-Pro bin 2x2 Gain 190. -10C
William Optics RedCat 51 v1.5 f/4.9
Baader 3.5nm Ha, 4nm O3 2”
iOptron CEM25P
Pegasus Pocket Powerbox
ZWO guidescope and ASI120MM-S guide cam
A 1x2 panel mosaic consisting of a total of 95x300s Ha and 221x300s O3 images for over 26 hours total.
Stacked in APP, processed in PI and PS using StarNet and Russell Croman tools.