Last Updated
：2025/11/23
protoplanetary nebula
（ plural ）
（ plural ）
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(astronomy) A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.
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protoplanetary nebula
Astronomers captured vivid images of the protoplanetary nebula as the aging star began expelling its outer layers.
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Astronomers captured vivid images of the protoplanetary nebula as the aging star began expelling its outer layers.
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