IC 1295

Amid the myriad stars toward the inner Milky Way lies a set of colorful nested shells comprising the planetary nebula IC 1295 in Scutum, which were ejected episodically late in the life of the hot blue stellar core visible at its center. its bluish-green appearance arises from strong shock-excited emission from the atomic oxygen embedded in its layers...
https://skyandtelescope.org/online-gallery/the-southern-planetary-nebula-ic-1295-in-scutum/