[Placidus (Mike and Trish)]

Originally Posted by markas

Great image of a wonderfully complx area.

Mark

Thanks Mark.

Originally Posted by Retrograde

That's beautiful and exquisitely detailed Mike & Trish.
I really loved the in-depth explanation too

Hi, Pete. Very glad you liked it.

Wish I understood more about what we're looking at. When is it the ejectate of just one supernova in largely empty space? When is it the ejecta of multiple supernovas hitting dense pre-existing medium? When is it pre-supernova stellar winds carving out a cavity? How does one tell? Why exactly, in detail, do we see predominantly OIII here and H-alpha there? (I've got the general principles but not the case by case details). Would so much like to know.

Best,
Mike