protoplanetary nebula

English

Etymology

proto- +‎ planetary nebula

Noun

protoplanetary nebula (plural protoplanetary nebulae or protoplanetary nebulas)

(astronomy) A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.

Synonyms

preplanetary nebula

Translations

stage in stellar evolution

Finnish: esiplanetaarinen sumu

See also

protoplanetary disk

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