The search for water across the Solar System and the galaxy is also the search for life.
Water is not unique to Earth. Astronomers have found evidence of water in many places across the universe — from icy moons to the atmospheres of distant exoplanets.
Water has been detected in the atmospheres of many exoplanets using telescopes like Hubble and James Webb Space Telescope (JWST). The presence of water vapor is considered a key biosignature in the search for potentially habitable worlds.