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Earth has 1,335 ZL of water - 1 zettaliter (ZL) equals 1 billion km³ of water . In October 2020, NASA announced the discovery of liquid water on the Moon, but this is not the only place in the Solar System where it has already been found. Europa, one of dozens of moons that orbit Jupiter, has ice on its surface and evidence of a vast underground ocean.
A 20-year study published by the astrobiologist Steve Vance of NASA Jet Propulsion Laboratory suggests that these moons may have more liquid water than our planet: Europa (2.6 ZL), Callisto (5.3 ZL) Titan (18.6 ZL), and Ganymede (35.4 ZL). While Enceladus, Triton, Dione and Pluto may have the substance in lower quantities.
