Here is a series of morphological comparisons between atomic wavefunctions and stellar planetary nebulae, which are plasma envelopes surrounding white dwarf stars.

Eta Carinae is not a white dwarf, and the Homunculus Nebula is not a planetary nebula, though it shares some similar properties with planetary nebulae. This may or may not be relevant to your overall point, but you should definitely strive for total factual accuracy with these kinds of observations.