English Explanatory Dictionary

protoplanetary nebula

English dictionary entry

Meanings

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

Word forms

protoplanetary nebula protoplanetary nebulae protoplanetary nebulas

Etymology

From proto- + planetary nebula.

Synonyms

preplanetary nebula

Related words

protoplanetary disk
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