The shell ejection in making a planetary nebula is spherical and symmetrical in all cases.

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The shell ejection in making a planetary nebula is not always spherical and symmetrical. It depends on the characteristics of the star that is shedding its outer layers. Some planetary nebulae can have shapes that are bipolar, elliptical, or irregular. The shell ejection in making a planetary nebula is not always spherical and symmetrical. It can depend on the characteristics of the central star, its mass, and its companion star(s). Some planetary nebulae have asymmetrical shapes and features due to factors such as binary interactions, stellar winds, and magnetic fields.

The Shell Ejection in Making a Planetary Nebula Is Spherical