This category has the following 3 subcategories, out of 3 total.
Pages in category "Extraterrestrial life"
The following 54 pages are in this category, out of 54 total.
- Extraterrestrial life (astronomy)
- Drake equation (astronomy)
- Fermi paradox (astronomy)
- Hypothetical types of biochemistry (unsolved)
- Interplanetary contamination (astronomy)
- Kardashev scale (astronomy)
- Little green men (unsolved)
- Neocatastrophism (astronomy)
- Zoo hypothesis (astronomy)