Astrobiology is the study of life off of Earth. None has been found so it
is a bit speculative. The study includes:
- Modeling and search for signs of life such as compounds rare in nature but plentiful on Earth because of life.
- Modeling the conditions that would support the development and continuation of life such as Habitable Zones.
- Searches for signs of life in planetary visits such as on Mars.
NASA Astrobiology Institute (NAI)