Finding a living system on earth in what was once thought to be a sterile environment should enhance the liklihood of finding life off earth why?

Finding a living system on Earth in what was once thought to be a sterile environment, such as deep-sea hydrothermal vents or ice-covered lakes, expands our understanding of where life can thrive. This discovery increases the possibility of finding life in similarly extreme conditions on other planets or moons, broadening the range of potential habitable environments in the universe. It suggests that life may be more resilient and adaptable than previously thought, increasing the chances of discovering life beyond Earth.