# noctilucent cloud

> highly-elevated cloud-like ice crystals in the upper atmosphere of Earth visible during astronomical twilight

**Wikidata**: [Q192794](https://www.wikidata.org/wiki/Q192794)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Noctilucent_cloud)  
**Source**: https://4ort.xyz/entity/noctilucent-cloud


## References

1. [Source](https://cloudatlas.wmo.int/en/noctilucent-clouds.html)
2. [Source](https://sains.kompas.com/read/2018/09/24/193400423/awan-biru-elektrik-langka-tertangkap-kamera-nasa-apa-artinya-)
3. [Source](https://cloudatlas.wmo.int/en/noctilucent-clouds.html#physical-constitution)
4. Freebase Data Dumps. 2013
5. KBpedia