What are the conditions and criteria for habitability on other planets and moons within our solar system and beyond?

Habitability factors include the presence of liquid water, suitable temperatures, availability of nutrients, and protection from harmful radiation. Planetary bodies with potential habitable environments include Mars, Europa, Enceladus, and exoplanets within the habitable zone of other stars. Astrobiologists study extremophiles, organisms capable of surviving in extreme environments on Earth, to inform the search for life beyond our planet.