Water Could Have Drowned Earth If Not for Supernova

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Charles Choi, Space.com
Radioactive metal might help explain why Earth and its sibling worlds are not ocean planets hostile to life as we know it, a new study finds.Earth is the only world known to both have life and possess water covering most of it. Since there is life virtually wherever there is water on Earth, the hunt for potentially habitable planets is largely focused on worlds that might have water on their surfaces.