Transcript: The existence and abundance of extremophiles on Earth has implications for the search for extraterrestrial life. Remember that the entire idea of a habitable zone is predicated on a range of distance from a star where water can be in a liquid form. Perhaps this is too limiting an assumption. The first organisms on Earth were extremophiles, so maybe extremophiles formed first elsewhere in the universe and are relatively abundant. The wide range of physical conditions for extremophiles on Earth implies a wide range of possible environments for life. Perhaps life does not just form on a temperate watery planet but in more extreme conditions on other types of planets or Moons.