Abstract

The search for extraterrestrial intelligence on exoplanets is a rich field of conceptual exploration. Author introduces two definitions that could help to narrow down the possibilities that an extraterrestrial civilization may or may not have initiated exploration of its own star system and beyond. It is concluded that in some cases certain extraterrestrial civilizations may not be able to leave their home worlds before their biological extinction, purely because of physical limitations. Keywords: SETI, ETI, Exoplanets, Alien Civilizations, Alien Exploration

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