# light echo

> physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance; analogous to an echo of sound, it mostly only manifests itself over astronomical distances

**Wikidata**: [Q1823351](https://www.wikidata.org/wiki/Q1823351)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Light_echo)  
**Source**: https://4ort.xyz/entity/light-echo


## References

1. Freebase Data Dumps. 2013