# Protoplanetary nebula

> type of astronomical object

**Wikidata**: [Q2035809](https://www.wikidata.org/wiki/Q2035809)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Protoplanetary_nebula)  
**Source**: https://4ort.xyz/entity/protoplanetary-nebula


## References

1. Library of Congress
2. RAMEAU
3. Freebase Data Dumps. 2013
4. National Library of Israel Names and Subjects Authority File
5. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)