# Sloan Digital Sky Survey

> multi-spectral imaging and spectroscopic redshift survey

**Wikidata**: [Q840332](https://www.wikidata.org/wiki/Q840332)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Sloan_Digital_Sky_Survey)  
**Source**: https://4ort.xyz/entity/sloan-digital-sky-survey


## References

1. Freebase Data Dumps. 2013
2. Google Knowledge Graph
3. [Source](http://astro.vaporia.com/start/ugrizphotometricsystem.html)
4. Quora