WHAT DO YOU KNOW ABOUT THE OCEAN.
Earth is the only known planet or moon to have large bodies of liquid water on its surface. Our planet lies in the "Goldilocks" zone — not too hot, not too cold and with enough atmospheric pressure to prevent liquid surface water from evaporating into space. Although we don't yet know of any other planets or moons with liquid water oceans, it's likely that they do exist and we just haven't found them. In our own solar system, there is growing evidence that the planet Mars may have liquid water not on the surface but underground. There is also strong evidence that liquid oceans may be hidden beneath the thick icy surfaces of three of Jupiter's moons (Europa, Callisto and Ganymede) and two of Saturn's moons (Titan and Enceladus).
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