sentences:  Liquid water is thought to be common in other planetary systems, despite the lack of conclusive evidence, and there is a growing list of extrasolar candidates for liquid water.In June 2020, NASA scientists reported that it's likely that exoplanets with oceans may be "common" in the Milky Way galaxy, based on mathematical modeling studies.As of December 2015, the confirmed liquid water in the Solar System outside Earth is 25–50 times the volume of Earth's water (1.3 billion cubic kilometers).