# Fifth planet

> any of various hypothetical planets thought to have existed

**Wikidata**: [Q1105734](https://www.wikidata.org/wiki/Q1105734)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Fifth_planet_(hypothetical))  
**Source**: https://4ort.xyz/entity/fifth-planet


## References

1. Freebase Data Dumps. 2013