Compared to other observed forms, how frequently are truly spherical planetary nebulae detected?
Answer
Truly spherical nebulae are relatively rare compared to the vast majority of observed forms.
While the simplest theoretical model of mass shedding from a star—uniform dispersal in all directions—would result in a perfect sphere, observations indicate that perfectly spherical planetary nebulae are not the dominant type. The reality of observed nebulae demonstrates an enormous range of geometries, with spherical shapes being relatively uncommon. The majority of observed forms exhibit asymmetry or elongation, such as bipolar or elliptical shapes, suggesting that the mass ejection process is rarely perfectly uniform or uninfluenced by other factors.
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