# Rare Earth hypothesis

> hypothesis that complex extraterrestrial life is a very improbable phenomenon and likely to be extremely rare

**Wikidata**: [Q865447](https://www.wikidata.org/wiki/Q865447)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Rare_Earth_hypothesis)  
**Source**: https://4ort.xyz/entity/rare-earth-hypothesis


## References

1. Freebase Data Dumps. 2013
2. BBC Things