Exoplanet “Water Worlds” Could Hold Unfathomably Deep Alien Oceans

A new theory suggests that a type of exoplanet two to four times the size of Earth ("sub-Neptunes") is likely to be a water world, not a gas dwarf.

Water Worlds Scientists have already spotted thousands of exoplanets — planets that orbit a star outside of the Solar System — and many have the potential to harbor life. A wild new theory suggests that exoplanets two to four times the size of Earth, known as “sub-Neptunes,” are likely to be water worlds rather than gas dwarfs — and their oceans could be […]

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