One found in Draco is called the Cat's Eye and has a concentric shell structure, suggesting it was formed by a series of regular events.
The layers of the Little Ghost, one of these, are red furthest from the center. The Rotten Egg is a proto-one, and exhibits the bipolar structure typical of others like the Butterfly. One found in Draco is called the Cat's Eye and has a concentric shell structure, suggesting it was formed by a series of regular events. Magnetic fields lead to filamentation in them, and matter bounded ones are fully plasma, while UV bounded ones possess an ionization front. FTP, identify this class of nebulae, all of which have a star in their center, composed of the hydrogen and helium ejected outer layers of red giants.
The layers of the Little Ghost, one of these, are red furthest from the center.
{planetary} nebulae (accept {nebulae} before “{proto},” prompt on {nebulae} after “{proto}”)