5 years ago
Mysterious 'Sub-Neptunes' Are Probably Water Worlds
Water worlds that each possess thousands of times more water than Earth does may be more common than Earth-like rocky planets in the Milky Way galaxy, a new study finds. Over the past 20 or so years, astronomers have confirmed the existence of thousands of exoplanets, or planets around other stars. NASA's recently deceased Kepler spacecraft discovered 2,702 confirmed exoplanets, and several thousand more "candidates" it found are awaiting confirmation.
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