An ocean planet not only has its entire surface covered by water; much of its mass and volume is water. Our planet, Earth, has 71% of its surface covered by oceans. But water represents only 0.05% of the planetary mass. We live on a rocky planet with a thin ocean that has a maximum depth of just over 10 kilometers. On an ocean planet the depths are abysmal, hundreds or even thousands of kilometers. At the bottom the water is so compressed that it solidifies and crystallizes, forming exotic species of ice, such as ice VII.
In this artwork we can see an ocean planet with a large extrasolar moon. The atmosphere is dense and saturated with water vapor and there is a persistent mist on the surface of the sea. All this causes an important greenhouse effect.
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