Part of the SETI Institute's monthly Lecture series, SETI Talks Extremophiles are organisms that live in extreme environments on Earth. Scientists have investigated their ability to survive to high temperatures, UV radiation, salty environments and places that are inhospitable for humans and most creatures on Earth. By studying conditions under which life can thrive, we hope to understand life elsewhere – where to look for it and what it could look like -- or simply to hypothesize if it would be