NGC 6781 (planetary nebula) #Celestron 8/AVX, 0.4X focal reducer, ASI29MC Pro 30x60s subs, Autostakkert!3 GraXpert, Corel PSP. cropped image #Astrophotography

A "planetary nebula" actually doesn't have anything directly due to planets, it got named that because of the shape. What it actually is is a nebula of gas shed as a red giant becomes a white dwarf, illuminated by the exposed core as it transitions into fusing helium.