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protoplanetary nebula

noun

protoplanetary nebula

noun

Etymology From proto- + planetary nebula.

1

Astronomy, Natural sciences A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.

Synonyms
preplanetary nebula
Related terms
protoplanetary disk

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.