alien civilizations
Intelligent life elsewhere
Alien civilizations are intelligent societies originating from somewhere other than Earth.
The term appears mostly in speculative contexts—science fiction, discussions of space exploration, and debates about extraterrestrial life: If alien civilizations exist, why haven't we detected their signals?
The search for alien civilizations drives projects like SETI.
- Drake equationFormula estimating detectable civilizations
- Fermi paradoxWhy no extraterrestrials yet?
- MartiansFourth planet's supposed inhabitants
- aliensBeings from other worlds
- close encountersBrief proximity with something
space opera · extraterrestrial · advanced technology · SETI · galactic empires · hive mind · first contact · prime directive · biosignature · astrobiology · habitable zone · radio telescope · terraforming · exoplanet · panspermia · interstellar communication · interstellar travel · UFO
- UFO LoreUFOs, flying saucers, close encounters, Roswell, Area 51
alien civilizationshumanity
People as a whole
mankind · human society · earthlings · Homo sapiens · human race