Observing a highly knotted or clumpy nebula suggests what about the star's mass ejection history?

Answer

The ejection process was not smooth, fluctuating in speed or direction.

Highly knotted or clumpy features imply that the mass ejection process, particularly during the fast wind phase, was not smooth but likely fluctuated significantly in speed or direction.

Observing a highly knotted or clumpy nebula suggests what about the star's mass ejection history?

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